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Constantin Aniculaesei (The University of Texas at Austin)11/7/22, 8:50 AM
We present recent results from a proof-of-principle laser-plasma acceleration experiment that reveal a unique synergy between a laser-driven and particle-driven accelerator: a high-charge laser-wakefield accelerated electron bunch can drive a wakefield while simultaneously drawing energy from the laser pulse via direct laser acceleration. This process continues to accelerate electrons beyond...
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Bo Miao (University of Maryland), Jaron Shrock (University of Maryland, College Park), Ela Rockafellow (University of Maryland, College Park)11/7/22, 9:20 AM
Conventional RF electron accelerators are limited by breakdown potentials to ~100 MeV/m. This poses significant economic and practical obstacles for the construction of new, high energy particle accelerators which can be used as advanced light sources, or as colliders to probe new fundamental physics regimes. Laser Wakefield accelerators (LWFAs), which can achieve acceleration gradients 1000...
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Richard D'Arcy11/7/22, 9:50 AM
High-gradient plasma-wakefield acceleration represents an exciting route towards both boosting the energy and reducing the footprint of future particle colliders and free-electron lasers. At such facilities thousands or even millions of high-charge particle bunches with low energy spread and low emittance will need to be accelerated in an energy-efficient manner in order to outperform current...
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Severin Diederichs (DESY / LBNL)11/7/22, 10:40 AM
Stable acceleration of high-quality beams is a critical task for the realization of a plasma-based, linear collider. However, in plasma accelerators, the acceleration of collider-relevant positron beams is challenging even conceptually. Recently, many new positron acceleration schemes have been proposed to overcome this issue. In this talk, we review the latest advances on plasma-based...
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Karl Zeil (Helmholtz-Zentrum Dresden-Rossendorf)11/7/22, 11:10 AM
Exploiting the strong electromagnetic fields that can be supported by a plasma, high-power laser driven compact plasma accelerators can generate short, high-intensity pulses of high energy ions with special beam properties. By that they may expand the portfolio of conventional machines in many application areas. The maturation of laser driven ion accelerators from physics experiments to...
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Angelo Biagioni (INFN)11/7/22, 11:40 AM
The breakthrough provided by plasma-based accelerators enabled unprecedented accelerating fields by boosting electron beams to GeV energies within few cm. This enables the realization of table-top accelerators able to drive a Free-Electron Laser (FEL), a formidable tool to investigate matter at sub-atomic level by generating X-UV coherent light pulses with fs and sub-fs durations.
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So far,... -
Vladimir Shiltsev (Fermilab)11/7/22, 1:30 PMWG5 Oral: Beam Sources, Monitoring, and ControlContributed Oral
Plasma wakefield acceleration (PWA) channels are characterized by very high accelerating gradients and very strong focusing fields. We propose to employ these properties for effective production of low emittance high energy muon beams, consider muon beam dynamics in the PWFA cell and analyze various options and potential of the PWA-based muon sources.
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Qiang Chen (Lawrence Berkeley National Laboratory)11/7/22, 1:30 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
We show the recent results of electron injection into the laser wakefield accelerators by interfering two intense, nearly colinear laser pulses in underdense plasma [1, 2]. In the experiment, electrons could be injected into either laser wakefields, or both, depending on the relative delay between two laser pulses’ arrival time to the interference point. Particle-in-cell simulations revealed...
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James Chappell (University of Oxford)11/7/22, 1:30 PM
Beam-driven plasma-wakefield accelerators offer significant potential as compact, high-gradient, high-quality accelerators, either as the basis of a future plasma-based facility or as an ‘after-burner’ stage appended to conventional accelerators to boost their peak energy. To maximise applicability of such devices, plasma-based accelerators must be capable of operating at repetition-rates...
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Dr Arie Irman (Helmholtz-Zentrum Dresden - Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany)11/7/22, 1:30 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
Laser Plasma Accelerators (LPAs), harnessing gigavolt-per-centimeter accelerating fields, can generate high peak current, low emittance and GeV class electron beams paving the way for the realization of future compact free-electron lasers (FELs). Here, we report on the commissioning of the COXINEL beamline driven by the HZDR plasma accelerator and experimental demonstration of FEL lasing at...
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James Allen (SLAC National Accelerator Laboratory)11/7/22, 1:45 PM
Positron acceleration in plasma is a topic of interest for future applications of plasma-based linear colliders. At FACET, we investigated the acceleration of positrons in plasma under a variety of regimes including linear, non-linear, and hollow channel configurations. Over the course of these experiments, we observed the acceleration of plasma electrons captured in a positron beam-driven...
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Nathan Majernik11/7/22, 1:50 PMWG5 Oral: Beam Sources, Monitoring, and ControlContributed Oral
We report the development of a multileaf collimator (MLC) for charged particle beams, based on independently actuated tungsten strips which can selectively scatter unwanted particles. The MLC is used in conjunction with an emittance exchange beamline to rapidly generate highly variable longitudinal bunch profiles. The developed MLC consists of 40 independent leaves that are 2 mm wide and can...
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Chaojie Zhang (UCLA)11/7/22, 1:50 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
One of the two long-term applications of plasma-based accelerators is to develop the fifth-generation light source such as a compact free electron laser (FEL), which requires the generation of ultrahigh brightness electron bunches [1]. Recently, self-amplified spontaneous emission (SASE) by bunches from both laser- and beam-driven plasma accelerators have been observed [2, 3]. If the drive...
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Rafi Hessami (SLAC National Accelerator Laboratory)11/7/22, 1:50 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
The ongoing Plasma-driven Attosecond X-ray source experiment (PAX) at FACET-II aims to produce coherent soft x-ray pulses of attosecond duration using a Plasma Wakefield Accelerator [1]. These kinds of X-ray pulses can be used to study chemical processes where attosecond-scale electron motion is important. As a future upgrade to this concept, we investigate scaling to shorter soft X-ray...
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John Power11/7/22, 1:50 PMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
The Argonne Wakefield Accelerator (AWA) is a beam test facility at Argonne National Laboratory. It consists of a 65 MeV L-band photoinjector beamline, 3 additional independent photoinjector beamlines, and multiple flexible experimental areas. Its program is composed of three research themes: (1) Advanced Accelerator Concepts (AAC), (2) Beam Manipulation, and (3) Beam Production. The AAC...
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Dr Alexander Debus (Helmholtz-Zentrum Dresden-Rossendorf)11/7/22, 1:50 PMWG2 Oral: Computation for Accelerator PhysicsContributed Oral
Traveling-wave electron acceleration (TWEAC) is an advanced laser-plasma accelerator scheme, which is neither limited by dephasing, nor by pump depletion or diffraction. Such accelerators are scalable to energies beyond 10 GeV without the need for staging and are candidates for future compact electron-positron colliders based on existing CPA lasers. TWEAC utilizes two pulse-front tilted laser...
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Kenneth Marsh (UCLA ECE)11/7/22, 2:00 PM
In PWFA experiments, like at FACET, most of the beam energy can be transferred into the wake and trailing plasma oscillations. These oscillation in turn lead to intense plasma heating and expansion. As a practical matter, to reach high average current the heat must be removed between electron bunches. Interestingly, the rapid plasma expansion is unstable and can produce filamentary structures...
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Spencer Gessner (SLAC)11/7/22, 2:10 PMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
We present the results of the Snowmass Implementation Task Force (ITF) analysis of future collider concepts. We consider both the environmental cost of construction (CO2 footprint per meter of tunnel) and the carbon footprint associated with collider power consumption. We discuss strategies to mitigate the power consumption of future high-energy colliders, such as energy recovery, and we...
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Laura Corner (Cockcroft Institute, University of Liverpool)11/7/22, 2:10 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
We report on the injection of 35MeV electron bunches into a laser-driven plasma wakefield at the CLARA linear accelerator, Daresbury Laboratory, UK. In this initial proof-of-principle experiment, we observed the broadening of the energy spectrum of 6ps electron bunches injected into a plasma, demonstrating successful acceleration/deceleration of electrons within the wakefield. We discuss...
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Michael Downer (The University of Texas at Austin)11/7/22, 2:10 PMWG5 Oral: Beam Sources, Monitoring, and ControlContributed Oral
We show that uncontrolled phase fluctuations within an outer annulus of the near-field profile of a laser-wakefield drive pulse are primarily responsible for shot-to-shot fluctuations in the energy, charge, and pointing of wakefield-accelerated electrons. When a mask removes this unstable annulus, RMS fluctuations decrease by more than half without compromising average electron energy...
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Claire Hansel (University of Colorado Boulder)11/7/22, 2:10 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
The ion channel laser (ICL) is an alternative to the free electron laser (FEL) that uses the electric fields in an ion channel rather than the magnetic fields in an undulator to transversely oscillate a relativistic electron beam and produce coherent radiation. The strong focusing force of the ion channel leads to a Pierce parameter more than an order of magnitude larger than the typical...
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Walter Lynn (UCLA)11/7/22, 2:15 PM
Relativistic charged-particle beams which generate intense longitudinal fields in accelerating structures also inherently couple to transverse modes. The effects of this coupling may lead to beam break-up instability, and thus must be countered to preserve beam quality in applications such as linear colliders. Beams with highly asymmetric transverse sizes (flat-beams) have been shown to...
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Michael Bussmann (Helmholtz-Zentrum Dresden - Rossendorf)11/7/22, 2:20 PMWG2 Oral: Computation for Accelerator PhysicsContributed Oral
PIConGPU, like many other codes, is ready for the next Exascale supercomputers. Heterogeneous programming as the main ingredient enables effective use of these machines. Important challenges still ahead are timely analysis of large scale simulation data and complex workflows for multi-physics simulations and machine learning.
As experimental capabilities progress and high-repetition rate...
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Alexander Rainville (University of Michigan)11/7/22, 2:30 PMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
Next generation particle accelerators based on laser plasma interactions are a promising path towards achieving GeV gradients in small volumes, thus substantially reducing the size of accelerators needed for both frontier science and practical applications from materials science to medicine. These accelerators will require laser drivers with ultrashort pulses, joule energy levels and 10s kHz...
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Navid Vafaei-Najafabadi (Stony Brook University, Brookhaven National Laboratory)11/7/22, 2:30 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
Two-color ionization injection is a promising method for realizing an all-optical, plasma photocathode. In this method, a nonlinear plasma wakefield is driven by a long-wavelength laser, and the ionization injection occurs using a second, high-intensity laser pulse with a short wavelength. Recent upgrades at the Accelerator Test Facility (ATF) of the Brookhaven National Laboratory has provided...
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Nathan Cook (RadiaSoft LLC)11/7/22, 2:30 PMWG5 Oral: Beam Sources, Monitoring, and ControlContributed Oral
Ultrafast lasers play an increasingly critical role in the generation, manipulation, and acceleration of electron beams. Laser plasma accelerators enable order of magnitude improvements in accelerating gradient and promise compact tunable GeV electron beam sources, while novel photocathode systems permit fundamental advances in electron beam manipulation for accelerator and radiation...
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Walter Lynn (UCLA)11/7/22, 2:30 PM
Dielectric Wakefield Acceleration (DWA) as a practical means of realizing next-generation accelerators is predicated on the ability to sustain the beam-structure interaction over experimentally meaningful length scales. This goal is complicated by the fact that the beams in question inherently couple to transverse modes in addition to the desired longitudinal modes which, if left unaccounted...
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Robert Ariniello (SLAC National Accelerator Laboratory)11/7/22, 2:45 PM
When a high intensity electron beam is passed through a structured nano target, the solid-state density plasma created can support ultra-high accelerating gradients, on the order of 1-10 TeV/m. The similarly strong transverse focusing fields are expected to produce beams with small equilibrium emittance. Driving these extreme wakefields in the self-modulated regime requires high energy and...
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Rafi Hessami (SLAC National Accelerator Laboratory)11/7/22, 2:50 PMWG5 Oral: Beam Sources, Monitoring, and ControlContributed Oral
We investigate electrostatic traps as a novel source of positron beams for accelerator physics applications. The electrostatic trap is a simple device that accumulates and cools positrons produced by a radioactive source. Using well-established techniques, the positron beam is cooled down to or below room temperature. The thermal beam emittance is an order of magnitude smaller than beams...
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Jarrod Leddy (Tech-X Corporation)11/7/22, 3:30 PM
Lasers of sufficient intensity passing through a neutral gas will ionize the gas creating a plasma channel in its wake. A shock can propagate from this locally heated region through the created plasma and background gas, however the density of the plasma will determine the dynamics of the plasma. For collisional (high density) plasmas this can be modeled with a fluid code, however a kinetic...
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Ben Freemire (Euclid Beamlabs)11/7/22, 3:30 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
As part of the Argonne 500 MeV short pulse Two Beam Wakefield Acceleration Demonstrator, several single cell X-band dielectric disk loaded accelerators (DDA) have been designed, fabricated, and tested at high power at the Argonne Wakefield Accelerator. The DDA should provide a short pulse (~20 ns) high gradient (>100 MV/m) accelerator while maintaining a reasonable r/Q and high group...
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Zan Nie (UCLA)11/7/22, 3:30 PM
High-gradient and high-efficiency acceleration in plasma-based accelerators has been demonstrated, showing its potential as the building block for a future collider operating at the energy frontier of particle physics. However, generating and accelerating the required spin-polarized beams in such a collider using plasma-based accelerators has been a long-standing challenge. Here we show that...
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Yusuke Sakai (University of California Los Angeles)11/7/22, 3:30 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
Recent progress of fundamental study on nonlinear inverse Compton scattering (ICS) will be reported. Experiment has been performed in Brookhaven National Laboratory Accelerator Test Facility. Counter collision of TW CO2 laser and 60-70 MeV electron beam having 300 pC of charge per pulse induce clear structure of nonlinear electrodynamics in X-ray radiation characteristics. In addition,...
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Nathan Cook (RadiaSoft LLC)11/7/22, 3:45 PM
Structured plasmas present myriad opportunities for acceleration and control of electron and positron beams for advanced concepts accelerators. Modeling these systems is challenging, owing to the orders of magnitude disparities in the spatiotemporal scale lengths between beam or laser and background plasma evolution. We discuss the application of the FLASH code, a publicly available MHD...
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Nainoa Nambu (UCLA)11/7/22, 3:48 PM
The generation and acceleration of an electron beam with a high degree of spin polarization is desirable for future plasma-based high-energy colliders. Our recent theoretical and simulations work [1,2] has shown that spin polarized electrons can be produced from photoionization of 4f14 electrons of Yb III ions by a circularly polarized laser, and then accelerated to multi-GeV energies while...
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Igor Pogorelsky (BNL)11/7/22, 3:50 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
Inverse Compton scattering (ICS) from relativistic electron beams colliding with laser pulses can be used for relatively compact and affordable x-ray and gamma sources complementing conventional synchrotron light sources (SLSs). Several proposals have been put forward on converting electron accelerators to Inverse Compton Scattering (ICS) gamma sources. Different types of particle accelerators...
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Sarah Weatherly (Illinois Institute of Technology, Argonne National Laboratory)11/7/22, 4:00 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
A method of decreasing the required footprint of linear electron accelerators and to improve their energy efficiency is utilizing short RF pulses (~9 ns) with Dielectric Disk Accelerators (DDA). A DDA is an accelerating structure that utilizes dielectric disks in its design to improve the shunt impedance. Two DDA structures have been designed and tested at the Argonne Wakefield Accelerator. ...
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Dr Rob Shalloo (DESY)11/7/22, 4:00 PM
Recent results have demonstrated hydrodynamic optical-field-ionised plasma channels as being a promising plasma source for efficient, high-repetition-rate laser plasma accelerators.
Understanding the dynamics of these plasma waveguides is critical to improving their performance and for tailoring their modal properties to fit a given experimental setup. This can be challenging as the...
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Jiayang Yan (Stony Brook University)11/7/22, 4:06 PM
Plasma wakefield accelerators (PWFA) have demonstrated acceleration gradients of tens of GeV per meter. For injecting high-quality electron beams, a method called beam-induced ionization injection (B-III) is proposed. In this method, the drive beam field increases as its slice envelope oscillates to its minimum value due to the betatron oscillations and releases impurity plasma electrons that...
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Dillon Ramsey (LLE/UR)11/7/22, 4:10 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
In nonlinear Thomson scattering, a relativistic electron reflects and reradiates the photons
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of a laser pulse, converting optical light to x rays or beyond. While this extreme frequency
conversion offers a promising source for probing high-energy-density materials and
driving uncharted regimes of nonlinear quantum electrodynamics, conventional nonlinear
Thomson scattering has inherent... -
Klaus Steiniger (Helmholtz-Zentrum Dresden-Rossendorf)11/7/22, 4:15 PM
The Hybrid Collaboration, a joint undertaking by HZDR, DESY, University of Strathclyde, LMU, and LOA, performed hybrid LPWFA experiments which utilize electron bunches from a laser wakefield accelerator (LWFA) as drivers of a plasma wakefield stage (PWFA) to demonstrate the feasibility of compact PWFAs serving as a test bed for the efficient investigation and optimization of PWFAs and their...
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Andrew Sutherland (University of Strathclyde)11/7/22, 4:24 PM
Plasma photocathodes aim for the tunable production of compact electron beams with normalized emittance and brightness many orders of magnitude better than conventional sources. Experimental realization of such beams would open numerous prospects for transformative plasma wakefield accelerator applications based on ultrahigh-brightness beams. Developing a plasma capable of high-gradient...
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Alexey Arefiev (UC San Diego)11/7/22, 4:30 PM
In a typical laboratory plasma, there are no native positrons, which complicates attempts to develop a laser-driven positron accelerator. High-power high-intensity lasers provide an attractive opportunity to create positrons directly from light. While most attention has been focused on the multi-photon process, the process that involves two gamma-rays, the linear Breit-Wheeler (BW) process,...
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Chunguang Jing11/7/22, 4:30 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
Shunt impedance is one of the most important parameters characterizing particle acceleration efficiency. It is known that RF losses are reduced at cryogenic temperatures. For example, a record high shunt impedance of 350 MΩ/m was demonstrated recently for all metal X-band accelerating structure, which is more than 2 times higher than that at room temperature. Here we present a novel hybrid...
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Bernardo Malaca (GoLP/Instituto Superior Técnico, University of Lisbon)11/7/22, 4:30 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
Well known light emitting mechanisms (e.g. betatron radiation and non-linear Thomson scattering) are based on the motion of single-particles. Experiments demonstrated that these mechanisms can lead to the emission of bright radiation bursts, with frequencies extending up to the x-rays and beyond. These sources have intrinsic limitations: the electron velocity is always lower than the speed of...
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Lily Berman (University of Strathclyde)11/7/22, 4:42 PM
A barrier to realizing a plasma-based XFEL is the energy chirp of the accelerated electron bunch. If such a chirp is not removed prior to extraction it is difficult to maintain bunch qualities during transport to the undulator stage, and the FEL performance will be degraded or inhibited entirely. The Trojan Horse (TH) injection method uses a plasma photocathode approach to release and trap...
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Yine Sun (Argonne National Laboratory)11/7/22, 5:00 PM
Electron beam generated by an injector is often characterized by a set of parameters such as rms normalized emittance, bunch length, peak current, energy etc.. For different applications, the requirement for the beam parameters can be very different. In addition, some beam applications require finer control of the electron distribution such as specific shapes for its projection along a...
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Navid Vafaei-Najafabadi (Stony Brook University)11/7/22, 5:00 PM
With accelerating gradients of tens of GeV/m, plasma accelerators have a great potential for replacing RF cavities in future colliders and FEL light sources. However, the beams generated by these accelerators need to satisfy stringent quality metrics before they can be considered for the aforementioned applications. One such metric is the relative energy spread ΔE/E, which needs to be at a...
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Dr Mark Hogan (SLAC National Accelerator Laboratory)11/8/22, 8:30 AM
The FACET-II facility at SLAC National Accelerator Laboratory conducts a broad science program based on the interaction of low-emittance high-current 10 GeV electron beams with lasers, plasmas and solids. FACET-II operates as a National User Facility while engaging a broad User community to develop and execute experimental proposals that advance the development of plasma wakefield...
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Tatiana Nechaeva (Max-Planck-Institut fur Physik (DE))11/8/22, 9:00 AM
Hosing of particle bunches [1] (or laser pulses) driving or experiencing wakefields in plasma may impose limits on the quality and efficiency [2] of the acceleration process. Understanding and measuring hosing is therefore important and interesting. We present an experimental study of hosing of a long proton bunch in plasma. We induce hosing with the relative misalignment between the...
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Ralph Assmann (DESY & INFN)11/8/22, 9:30 AM
In recent years Europe had an intense discussion on roadmaps for accelerator R&D and research infrastructures. Several roadmaps were published and prominently include advanced accelerators. Of particular visibility are the 2021 Roadmap Update of the government-led European Strategy Forum for Research Infrastructures (ESFRI) and the 2022 publication of the European Roadmap on Accelerator R&D...
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Xueying Lu (NIU / ANL)11/8/22, 10:30 AM
Structure wakefield acceleration is an advanced accelerator concept which employs short drive electron bunches as compact power sources to accelerate witness bunches. It is promising to raise the accelerating gradient, which is limited to about 100 MV/m in conventional RF accelerators due to RF breakdowns, by confining an intense wakefield in short RF pulses. Based on the extensive research in...
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Axel Huebl (Lawrence Berkeley National Laboratory)11/8/22, 11:00 AM
Research of plasma-based accelerators has achieved significant milestones over the last decade. Highlights include achieving nearly 8 GeV electrons in a single-stage source, demonstrating plasma-based FELs, reaching stable proton acceleration of ultra-short, nC-class pulses that enable studies into ultrahigh dose rate radiotherapy. As the exploratory aspect of the field benefits significantly...
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Stepan Bulanov (LBNL)11/8/22, 11:30 AM
Abstract: One of the main applications of high power laser facilities is particle acceleration. It is due to the fact that ultrashort laser pulses in plasma are able to generate electromagnetic fields exceeding those typical for the conventional accelerators by many orders of magnitude. Laser ion acceleration is of particular interest due to unique beam properties and its potential application...
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Sergey Kuzikov (Euclid Techlabs, LLC)11/8/22, 1:30 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
High brightness beams for XFELs and UEM essentially imply a high current and a low emittance. To obtain such beams we propose to raise the accelerating voltage in the gun mitigating repealing Coulomb forces. An ultra-high gradient is achieved utilizing a short-pulse technology. A successful experiment with an X-band photoinjector has been recently carried out at Argonne Wakefield Accelerator...
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Jaron Shrock (University of Maryland)11/8/22, 1:30 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
Recent experiments [1] have demonstrated acceleration of electron bunches up to 5 GeV in long (20 cm) low density (~10^17 cm^-3) ionization-injected plasma waveguides [2]. The spectra of the recorded electron bunches showed multiple quasi-monoenergetic peaks with resolution limited energy spreads ~15%. For eventual development of a 10 GeV laser wakefield acceleration (LWFA) module for a staged...
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Doug Storey (SLAC National Accelerator Laboratory)11/8/22, 1:30 PM
The E300 experiment at FACET-II aims to demonstrate energy doubling of a witness bunch to 20 GeV through beam-driven plasma wakefield acceleration (PWFA) while preserving emittance and narrow energy spread. This talk will describe the status of the experimental setup including the current and expected accelerator parameters, the plasma source and associated differential pumping system, and...
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Miguel Pardal (GoLP/IPFN, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal)11/8/22, 1:30 PM
Radiation emission plasmas is often a result of collective effects associated with the dynamics of relativistic charged particles. A common numerical approach to model their motion involves the Particle-In-Cell scheme which solves the full set of Maxwell's equations and the relativistic Lorentz force for the charged particles.
The Radiation Diagnostic for OSIRIS (RaDiO) can retrieve the...
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Yanwen Jing (University of Michigan)11/8/22, 1:30 PMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
Practical use of laser plasma accelerators will require drivers with high peak power and high repetition rate. Spatially and temporally coherently combined fiber laser arrays offer one of the most promising pathways to such drivers. Temporal combining of ~100 stretched pulses, implemented as a coherent pulse stacking amplification (CPSA) technique [1], enables near-complete extraction of...
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Chaojie Zhang (UCLA)11/8/22, 1:45 PM
FACET-II is a new 10 GeV electron beam facility hosted by the SLAC National Accelerator Laboratory and E300 is the flagship experiment aiming at demonstrating high-quality two-bunch PWFA [1, 2]. An important goal of E300 is to demonstrate efficient (40%) energy transfer from the drive to the trailing bunch [1]. This number in turn is the product of the drive beam to the wake (80%) and from the...
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Pablo San Miguel (Laboratoire d'Optique Appliquée / Instituto Superior Técnico)11/8/22, 1:50 PM
It has been recently shown that a high-current ultrarelativistic electron beam can undergo strong self-focusing due to the Near-Field Coherent Transition Radiation (NF-CTR) emitted when interacting with multiple submicrometer-thick conducting foils [A. Sampath et al., Phys. Rev. Lett. 126, 064801 (2021)]. Particle-In-Cell simulations show that this self-focusing phenomenon is accompanied by...
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Tayari Coleman11/8/22, 1:50 PMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
Laser-wakefield plasma accelerators (LWFA) promise compact sources of highly energetic electrons and photons, but for their practical use they need efficient and high repetition rate laser drivers. The current standard is the Ti:sapphire CPA system, which can produce multi-J pulses with bandwidths supporting ~30 fs pulses, but it has low wall plug efficiency (WPE) and ~Hz repetition rates....
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Aimee Ross (University of Oxford)11/8/22, 1:50 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
The multi-pulse laser wakefield acceleration (MP-LWFA) scheme [1] provides a route for GeV-scale accelerators operating at kilohertz-repetition-rates driven by picosecond-duration laser pulses such as those available from thin-disk lasers. We recently published theoretical work proposing a new scheme of GeV accelerator based on MP-LWFA, which we call the Plasma-Modulated, Plasma Accelerator...
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Gongxiaohui Chen (Argonne National Laboratory)11/8/22, 1:50 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
A program to develop a sub-GV/m rf photocathode gun is underway at Argonne Wakefield Accelerator (AWA) facility as a pathway towards producing brighter electron bunches. The X-band rf gun is powered by high-power, short rf pulses (9-ns FWHM), which, in turn, are generated by AWA’s high-current drive beam. In a previous proof-of-principle experiment, an unprecedented gradient of 400 MV/m on the...
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Zan Nie (UCLA)11/8/22, 2:00 PM
FACET-II, a new 10 GeV electron beam facility at SLAC National Accelerator Laboratory for R&D on beam physics and novel acceleration techniques [1, 2], has been commissioned this year. One major research effort is on further development of the Plasma Wakefield Acceleration scheme (E300). The experimental results from the first run of the E300 experiment at FACET-II has shown evidence of...
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Lauren Cooper11/8/22, 2:10 PMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
A laser-plasma accelerator (LPA) could reach high energies with an accelerating length orders-of-magnitude shorter than in conventional RF accelerators. Compact LPAs will enable high-impact applications in science, medicine, security, and industry. As LPA applications will require new driver lasers with kHz to 10s kHz repetition-rates at high energy and efficiency [1], one promising laser...
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Afnan Al Marzouk11/8/22, 2:10 PM
We present first-principle simulations of coherent synchrotron radiation (CSR) using the large-scale LW3D code [Ryne, R. D., et al. "Large scale simulation of synchrotron radiation using a Lienard-Wiechert approach." Proc. IPAC 46 (2012).] which computes the Lienard-Wiechert fields in 3D from the total number of particles in the bunch. We have applied a straightforward adaptation in the LW3D...
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Roman Walczak (University of Oxford)11/8/22, 2:10 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
The energy required to drive a large-amplitude plasma wave can be delivered over many plasma periods, rather than in a single period, if the driving pulse is modulated. This approach opens up plasma accelerators to novel laser technologies which can provide the required energy at high pulse repetition rates, and with high wall-plug efficiency. We recently proposed [PRL 127, 184801 (2021)] that...
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Pietro Musumeci11/8/22, 2:10 PM
We present the design of an experiment aiming at the generation of a moderate energy (4 MeV) single sub-fs electron beam from an RF photoinjector for application in UED and injection in advanced accelerators. The design is based on an envelope equation-based approach to obtain analytical scaling laws for the shortest pulse length achievable using radiofrequency (RF) based bunch compression....
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Livio Verra (CERN)11/8/22, 2:15 PM
In this contribution we show, with experimental and numerical simulation results, that a long, relativistic proton bunch can be focused to an equilibrium transverse size, when traveling in underdense plasma.
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In the presence of the space-charge field of the bunch, the plasma electrons move towards the axis of propagation of the beam, generating a focusing force for the protons.
We observe... -
Jacob Pierce (UCLA)11/8/22, 2:30 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
Spatiotemporal control refers to a class of optical techniques for structuring a laser pulse with space-time dependent properties, including moving focal points, dynamic spot sizes, and evolving orbital angular momentum. These structured pulses have the potential to enhance a number of laser-plasma applications, including laser wakefield acceleration (LWFA) [1,2]. Here we introduce the concept...
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Felipe Peña (DESY/UHH)11/8/22, 2:30 PM
Beam-driven plasma-wakefield acceleration has the potential to reduce the size and construction cost of large-scale accelerator facilities, by providing accelerating fields orders of magnitude greater than that of conventional accelerating structures. To keep the running costs affordable, high energy-transfer efficiency from the wall-plug to the accelerated bunch has to be demonstrated. For...
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QIAN QIAN11/8/22, 2:30 PM
With the rapid development of high-power petawatt class lasers worldwide, exploring the physics in the strong field QED regime will become one of the frontiers for laser-plasma interaction research. Particle-in-cell codes including quantum emission processes are powerful tools for predicting and analyzing future experiments, where the physics of relativistic plasma is strongly affected by...
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Siyun Chen (Lawrence Berkeley National Lab)11/8/22, 2:30 PMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
Laser-plasma accelerators (LPA) can significantly reduce the large sizes of conventional accelerators, showing great potential, but they are challenged by today’s low operation repetition-rates (Hertz class). Achieving kilohertz repetition-rates is necessary to enable high impact applications in science, security, and medicine [DOE Basic Research Needs Workshop report, 2019].
One recognized...
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Yipeng Wu (UCLA)11/8/22, 2:45 PM
High-brightness electron beams are crucial for tremendous scientific applications, such as linear colliders, free-electron lasers (FEL) and accelerator-based coherent terahertz (THz) radiation sources. For these applications, precise manipulation of the beam longitudinal phase space (LPS), namely shaping the beam temporal and energy profiles, is of great importance. Here we present a novel...
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Jonas Björklund Svensson (DESY)11/8/22, 3:30 PM
Plasma lenses are of much interest to the plasma-accelerator community as their cylindrically symmetric and large focusing gradients facilitate beam-optics control of the highly divergent beams usually associated with plasma accelerators. However, a fundamental difference between plasma-based and conventional accelerators/focusing devices is that in the former the beams propagate through...
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Chunguang Jing11/8/22, 3:30 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
Multipactor discharges in dielectric accelerating structures are a major limitation on the performance of this otherwise very promising technology for future high energy physics machines and other applications. Multipactor occurs when the Secondary Emission Yield (SEY) of the dielectric material used in accelerating structures is significantly higher than 1. In this work, we evaluated the...
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Jihoon Kim (Cornell University)11/8/22, 3:30 PM
Relativistic ion beams have wide applications ranging from proton therapy, neutron beam/warm dense matter generation, and fast ignition of fusion pellets. In particular, generating a monoenergetic high energy flux ion beam is of great interest, since fast-ignition scheme of fusion targets require energy fluxes of ~GJ/cm^2. We show that a foam-based target with parabolically shaped front...
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Carlo Maria Lazzarini (ELI Beamlines)11/8/22, 3:30 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
The extremely high electric fields sustainable by a plasma make the Laser Wakefield Acceleration (LWFA) the most compact technique to generate very highly relativistic electron beams up to the GeV regime. The limited repetition rate and low efficiency of this technology has, to date, prevented to unleash its full potential as a unique source for basic research, biomedical applications and high...
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Claudio Emma11/8/22, 3:30 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
Plasma-driven light source development has recently made significant progress with multiple demonstrations of plasma-FEL gain [1-2] and the ongoing work of various facilities dedicated to plasma-FEL development [3]. In this contribution, we report on the status and prospects for one-such plasma-driven light source effort, the Plasma-driven Attosecond X-ray (PAX) experiment at FACET-II [4]....
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Dr Dan Abell (RadiaSoft LLC)11/8/22, 3:30 PM
Detailed thermal modeling of crystal amplifiers is a prerequisite for rapid improvement—higher pulse quality, higher average power at maximum achievable peak intensity, better repeatability, etc.—of high-intensity lasers ($100~\mathrm{TW}$ to multi-PW) with ultra-short pulse lengths ($< 100~\mathrm{fs}$). In recent work [1], we used the open-source, finite-element code FEniCS [2] to solve the...
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Seongyeol Kim (Argonne National Laboratory)11/8/22, 3:48 PM
Longitudinal bunch shaping based on transverse deflecting cavities (TDCs) was first proposed in Tech. Rep. No. LBNL-2670E, 2009 and further elaborated in Phys. Rev. Accel. Beams 23, 072803, 2020. Bunch shaping takes place in a straight beamline configuration of TDCs and a shaping mask. Two potential advantages of TDC-based shaping, over other shaping methods, is that it does not use dipole...
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Dr Rafal Zgadzaj (The University of Texas at Austin)11/8/22, 3:50 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
To date only solid-state laser pulses of wavelength 𝜆 ~ 1 micron have been powerful enough to drive laser wakefield accelerators (LWFAs). Chirped-pulse-amplified multi-terawatt, ~1 ps laser pulses of 𝜆 ~ 10 µm are now emerging from mixed-isotope, high-pressure CO$_2$ laser technology [1]. Such pulses open new opportunities to drive large ($R_b \sim 300$ µm) bubbles in low-density ($n_e <...
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176. Efficient propagation of electromagnetic pulses through high-power solid state laser amplifiersDr David Bruhwiler (RadiaSoft LLC)11/8/22, 3:50 PM
There is currently a lack of broadly available modeling software that self-consistently captures the required physics of gain, thermal loading and lensing, spectral shaping, and other effects required to simulate and optimize high-intensity lasers (100 TW to multi-PW) with ultra-short pulse lengths (< 100 fs) [1]. In recent work [2], we showed that low-resolution wavefront sensor (WFS) images...
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Jessica Shaw (University of Rochester Laboratory for Laser Energetics)11/8/22, 3:50 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
Contact and projection electron radiography using a laser-plasma electron accelerator driven by the OMEGA-EP laser are shown for static targets. Initial electron radiographs of laser-driven foils are shown along with a discussion of future experiments and applications. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award...
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Martin Rehwald (HZDR)11/8/22, 3:50 PM
Laser plasma-based particle accelerators attract great interest in fields where conventional accelerators reach limits based on size, cost or beam parameters. However, despite the fact that first principles simulations have predicted several advantageous ion acceleration schemes, laser accelerators have not yet reached their full potential in producing simultaneous high-radiation doses at high...
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Sergey Kuzikov (Euclid Techlabs, LLC)11/8/22, 4:00 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
RF breakdown and pulse heating are the greatest obstacles to increasing the accelerating gradient. Numerous experiments have shown that the RF breakdown and pulse heating thresholds depend on the exposure time of the structure to the RF fields. The idea described here is to accelerate particles by short (nanosecond or subnanosecond) duration wakefields in a structure assembled of individually...
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Michael Litos (University of Colorado Boulder)11/8/22, 4:06 PM
We present the progress made toward a plasma wakefield accelerator using a laser-ionized, unconfined gas plasma source for the E301 experiment at FACET-II. One advantage of this plasma source is that the density profile can be semi-arbitrarily defined via controlled focusing of a terawatt class laser pulse, allowing for the creation of entrance and exit ramps that can match the beam into and...
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Roopendra Singh Rajawat (Cornell University)11/8/22, 4:10 PM
Recently, a novel concept of Laser-Ion Lensing and Acceleration (LILA) [1] has been introduced for highly-efficient generation of monoenergetic low-emittance ion beams. The LILA scheme is based on the illumination of a solid-density target with radially-dependent thickness by an intense circularly polarized (CP) laser pulse, resulting in simultaneous acceleration and focusing of proton beams...
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Isabella Pagano (UT Austin/LLNL)11/8/22, 4:10 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
We aim to develop a diagnostic capable of high spatio-temporal resolution, specifically to be used in High Energy Density Science (HEDS) experiments. A Self-Modulated laser wakefield acceleration (SM-LWFA) driven broadband X-ray source was observed at the Titan target area, Jupiter Laser Facility. The spectral range was between 10 KeV to > 1 MeV, and took advantage of Betatron, Inverse Compton...
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Arohi Jain (Stony Brook University)11/8/22, 4:10 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
The study of laser wakefield acceleration (LWFA) using long wavelength infrared laser drivers is a promising path for future laser-driven electron accelerators when compared to traditional near-infrared laser drivers operating at $0.8-1$ $\mu\rm{m}$ central wavelength [1,2]. For a fixed laser intensity I, lasers with longer wavelengths $\lambda$ have larger ponderomotive potential ($\propto$...
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Christopher Doss (University of Colorado Boulder)11/8/22, 4:24 PM
With the commissioning of the 10 GeV FACET-II accelerator underway, early experimental shifts of the plasma lens have been taken. These shifts use a single electron bunch propagating through a laser-ionized elongated gas jet, with an electron beam imaging spectrometer set up to disperse the beam in energy for one transverse axis and image the beam directly in the other. Currently, a laser...
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Matthias Fuchs (University of Nebraska–Lincoln)11/8/22, 4:30 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
Laser-plasma accelerators (LPAs) operating in the bubble regime require driver lasers with relativistic intensities and pulse durations that are significantly shorter than the plasma wavelengths. This severely limits the laser technology that can be used to drive LPAs and with that their wide spread and the currently achievable LPA parameters, such as repetition rate. Here, we report a widely...
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Tanner Simpson (Laboratory for Laser Energetics, University of Rochester)11/8/22, 4:30 PMWG7 Oral: Radiation Generation and Advanced ConceptsContributed Oral
A laser pulse composed of a fundamental and properly phased second harmonic exhibits an asymmetric electric field that can drive a time-dependent current of photoionized electrons. The current produces a near-single-cycle burst of terahertz (THz) radiation. Experiments using ~1-TW ultrashort laser pulses observe optimal THz energies (~10-uJ) when the “two-color” pulse undergoes filamentary...
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Alexander Knetsch11/8/22, 4:30 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
Fields arising during the propagation of highly intense electron beams in structured targets of nanometer scale such as carbon-nanotubes can contain accelerating gradients of up to 10 TV/m with similarly strong focusing fields. Studies of beam-nanotarget interaction are therefore of interest as they may lead to an acceleration method with extremely high single-stage energy gains for electron...
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Rafal Zgadzaj (UT at Austin)11/8/22, 4:42 PM
The goal of the E-324 experiment ("Optical visualization of e-beam-driven wakes") at SLAC's 2nd-generation Facility for Advanced Accelerator Science and Experimental Tests (FACET-II) is to observe and understand electron- and ion-density structures that arise during, and at delays up to ~ms after, e-beam-driven production of strongly nonlinear plasma wakefields. The current set-up...
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Rafi Hessami (SLAC National Accelerator Laboratory)11/8/22, 5:00 PM
We investigate electrostatic traps as a novel source of positron beams for accelerator physics applications. The electrostatic trap is a simple device that accumulates and cools positrons produced by a radioactive source. Using well-established techniques, the positron beam is cooled down to or below room temperature. The thermal beam emittance is an order of magnitude smaller than beams...
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Nainoa Nambu (UCLA)11/8/22, 5:00 PMWG3 Poster: Laser and High-Gradient Structure-Based AccelerationStudent Poster
The generation and acceleration of an electron beam with a high degree of spin polarization is desirable for future plasma-based high-energy colliders. Our recent theoretical and simulations work [1,2] has shown that spin polarized electrons can be produced from photoionization of 4f14 electrons of Yb III ions by a circularly polarized laser, and then accelerated to multi-GeV energies while...
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Adam Higuet (University of Nebraska - Lincoln)11/8/22, 5:00 PM
The discretization of electromagnetic equations of motion can lead to changes in the dispersion relations such that particle velocities can meet or exceed the effective speed of light, even in vacuum. Numerical Cherenkov Radiation results from a resonance response between the electromagnetic potentials and superluminal charge. To assess the effects of numerical Cherenkov radiation on...
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Curtis Berger (Lawrence Berkeley National Laboratory)11/8/22, 5:00 PM
Laser plasma accelerators have the ability to produce high-quality electron beams in compact, all-optical-driven configurations, with the electron beams uniquely suited for a wide variety of accelerator-based applications. However, fluctuations and drifts in the laser delivery to the mm-scale plasma target (the electron beam source) will translate into electron beam source variations that can...
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Junzhi Wang (University of Nebraska-Lincoln)11/8/22, 5:00 PM
Ultrafast high-brightness X-ray pulses have proven invaluable for a broad range of research. Such pulses are typically generated via synchrotron emission from relativistic electron bunches using large-scale facilities. Recently, significantly more compact X-ray sources based on laser-wakefield accelerated (LWFA) electron beams have been demonstrated. In particular, laser-driven betatron...
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Marc Osenberg (Heinrich-Heine-Universität Düsseldorf, Institut für Laser- und Plasmaphysik)11/8/22, 5:00 PM
We present a novel all-optical streak camera (AOSC) based on the Kerr-effect which measures the relative temporal position of a laser pulse and a second short pulse of arbitrary constituents (e.g. electrons, protons, light, or x-rays) in a single shot. Many modern accelerator concepts rely on the coupling of an electron beam with a laser beam, which must overlap with ultra-high temporal...
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Nicholas Ernst (University of Michigan)11/8/22, 5:00 PM
We introduce a novel method of controlled electron injection for Laser Wakefield Acceleration (LWFA) operating in the high-intensity "bubble" regime. In this scheme, a fraction of a high-intensity "driver" pulse is diverted and compressed into a low power, few-cycle "satellite" pulse co-propagating alongside the driver. This satellite is tightly focused off-axis where it acts to perturb bubble...
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Sarah Schröder11/8/22, 5:00 PM
Beam-driven plasma-wakefield acceleration has the potential to significantly reduce the footprint of future linear colliders and free-electron lasers. Such applications place stringent demands on beam quality and stability. While great strides have been made towards the preservation of incoming transverse and longitudinal beam quality, first applications now require demonstration of useful...
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José Alejandro Franco Altamirano (The University of Texas at Austin)11/8/22, 5:00 PM
We reconstruct the spectral cut-off of bremsstrahlung x-rays generated by GeV laser-wakefield-accelerated electrons with 10% accuracy using a compact, modular x-ray stack calorimeter. Unfolded cut-off energies range from 1GeV to 3GeV and increase in accuracy with increasing energy, opposite to the trend for conventional magnetic spectrometers. Consequently, bremsstrahlung cut-off calorimetry...
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Irina Petrushina (Stony Brook University)11/8/22, 5:00 PM
The CO$_2$ laser at the Accelerator Test Facility of Brookhaven National Laboratory is a unique source generating 2 ps-long, multi-TW pulses in the mid-IR regime. This rapidly evolving system opens an opportunity for generation of large bubbles in low density plasmas (~10$^{16}$ cm$^{-3}$) that are ideal for acceleration of externally injected electron beams. A new generation of diagnostic...
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Mr André Antoine (University of Michigan)11/8/22, 5:00 PM
In the interaction of high-intensity lasers with over-dense plasmas, the hot electron population dictates system dynamics, driving ion acceleration and x-ray generation, and fast ignition, for example. The primary method for modeling these systems are particle-in-cell simulations (PIC), where macroparticles approximate the kinetics of a distribution of particles. A problem shared with...
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Lauren Cooper11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesStudent Poster
Coherently combined fiber lasers are considered to be among the most promising pathways towards developing power and energy scalable drivers for laser plasma accelerators (LPA) and other applications of high-intensity laser-matter interactions. Coherent pulse stacking amplification (CPSA) technique is a time-domain coherent combining using Gires-Tournois Interferometers (GTI) of multiple...
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Joshua Stackhouse (UC Berkeley)11/8/22, 5:00 PM
Since its installation in 2012, the petawatt (PW) facility at the Berkeley Lab Laser Accelerator (BELLA) Center primarily focused on the optimization of single-stage GeV-energy laser-plasma accelerators (LPAs). Recently, the PW facility completed an upgrade to install a new second beamline (2BL) and experimental target chamber. The installation of the second beamline enables BELLA PW to...
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193. Compact high-resolution multi-GeV electron spectrometer for PW-laser-driven plasma acceleratorsXiantao Cheng (University of Texas at Austin)11/8/22, 5:00 PM
With the availability of petawatt lasers, the space required to generate beams of electrons to GeV-levels by laser-plasma acceleration has reduced to that of the university laboratory [1]. However, measuring these electrons in the relatively compact space of a vacuum chamber that can be supported by the typical university laboratory is challenging, as it typically requires large magnets (peak...
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Jared De Chant (Michigan State University)11/8/22, 5:00 PM
Laser-driven (LD) ion acceleration has been explored in a newly constructed short focal length beamline at the BELLA petawatt facility (interaction point 2, iP2). For applications utilizing such LD ion beams, a beam transport system is required, which for reasons of compactness be ideally contained within 3 m. The large divergence and energy spread of LD ion beams present a unique challenge to...
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Mohamed Othman (SLAC NATIONAL ACCELERATOR LABORATORY)11/8/22, 5:00 PMWG3 Poster: Laser and High-Gradient Structure-Based AccelerationContributed Poster
Future colliders, such as the Electron Ion Collider (EIC) will require injector linacs to accelerate large electron bunches over a wide range of energies. Current designs are typically based around long travelling wave structures, where power is coupled on axis between cavities. We propose the use of a 1 m distributed coupling design as an efficient means of achieving high gradient...
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Pavle Juranic (Paul Scherrer Institut)11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesContributed Poster
This presentation will showcase the newest work to add to the SwissFEL light generation capabilities. Two sets of modulators within which an overlap between an optical laser and relativistic electron beam are being installed and tested to produce new soft x-ray pulse structures and seeded beams. The results from the installation and commissioning of the first structure, put into operation in...
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Jan Pucek (Max-Planck Institute for Physics)11/8/22, 5:00 PM
We study the propagation of an electron bunch travelling within a proton bunch through a plasma density ramp. The proton bunch charge density in the ramp is higher than the plasma density. In this nonlinear regime the bunch generates a high density, on-axis plasma electron filament. The filament is defocusing the externally injected electron witness bunch that can therefore be lost along the...
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Yuxuan Cao (University of Texas at Austin)11/8/22, 5:00 PM
We explore the possibility of self-guided CO2-laser driven wakefield accelerator with external injection from a linear accelerator. Since long-wavelength CO$_{2}$ laser pulse enables a lower power threshold for self-guiding, nonlinear LWFA at a lower plasma density with larger wakefield size can be achieved, making longer acceleration and external injection easier. We aim to find the optimal...
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Joshua Latham (University of Michigan)11/8/22, 5:00 PM
Measurements of Radio Frequency (RF) emission may be a useful diagnostic for electron dynamics in laser-plasma interactions. Such radiation can also be detrimental as a significant source of noise for other diagnostics. EMP measurements were made during interactions of high-power short-pulse lasers with gaseous density targets at the University of Michigan. In a nitrogen-doped helium target...
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Sophie Crisp (UCLA)11/8/22, 5:00 PMWG3 Poster: Laser and High-Gradient Structure-Based AccelerationStudent Poster
We present the latest experimental results using a dual grating dielectric laser accelerator (DLA) to modulate 6 MeV electrons. The structure is composed of two commercially available gratings, mounted independently with variable gap size controlled by 3 piezo motors. A 780 nm laser is used to drive the 800 nm periodic structure with gap size on the order of 1 um. These gratings are 4 mm long,...
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Adam Hughes (Imperial College London)11/8/22, 5:00 PM
Due to the oscillation and subsequent emission of synchrotron radiation of electrons accelerated to GeV-order energies over centimetre scales, laser wakefield accelerators (LWFAs) have produced x-ray beams with a peak spectral flux up to 104 photons/pulse/mrad$^{2}$/0.1% BW. In a recent experiment performed by Wood, J. et al., an f/40 parabolic mirror was used to focus a 100 TW laser pulse...
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Dr Viviana Vladutescu (NYCCT/ELI-NP)11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesContributed Poster
Laboratory working conditions and unproperly set experimental designs highly impact the instruments’ performance and shortens their life. Several studies have been conducted on the performance of optical components in ultrafast high-power lasers and metrology equipment. The work presented is a study of different types of damages observed on stretcher and compressor diffraction gratings used in...
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Valentina Lee (University of Colorado, Boulder)11/8/22, 5:00 PM
The stability of the drive electron beam in plasma wakefield acceleration (PWFA) is critical for the realization of many applications. The growing instability of a drive electron beam can couple into the plasma wake and further impact the transverse dynamics of the witness beam, rendering the emittance and energy spread to grow. Applications like positron acceleration in an electron-driven...
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Michael Downer (The University of Texas at Austin)11/8/22, 5:00 PM
X-ray induced Acoustic Computed Tomography (XACT) is an imaging modality that combines the high absorption contrast and penetration depth of x-rays with the 3D propagation advantages provided by high-resolution ultrasound waves. Absorbed x-rays in a sample cause a localized heating ($<$mK) and thermoelastic expansion inducing a detectable ultrasonic emission. Effective generation of sound...
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Pratik Manwani (University of California, Los Angeles)11/8/22, 5:00 PM
Particle beams with highly asymmetric emittance ratios are employed at accelerator facilities and are expected at the interaction point of high energy colliders. These asymmetric beams can be used to drive wakefields in dielectric structures and can be used to drive high gradient wakefields in plasmas. In plasma, the high aspect ratio of the drive beam can create a transversely elliptical...
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Thamine Dalichaouch (UCLA)11/8/22, 5:00 PM
Plasma-based acceleration (PBA) is a promising approach for generating high quality ultrarelativistic beams to drive next-generation x-ray light sources and particle collider experiments. Over the years, research has largely focused on injection methods that use a density down ramp or field ionization to generate such beams. Recently, we proposed and demonstrated new methods of controllable...
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James Allen (SLAC National Accelerator Laboratory)11/8/22, 5:00 PM
Positron acceleration in plasma is a topic of interest for future applications of plasma-based linear colliders. At FACET, we investigated the acceleration of positrons in plasma under a variety of regimes including linear, non-linear, and hollow channel configurations. Over the course of these experiments, we observed the acceleration of plasma electrons captured in a positron beam-driven...
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Muhammed Zuboraj (Los Alamos National Laboratory)11/8/22, 5:00 PMWG3 Poster: Laser and High-Gradient Structure-Based AccelerationContributed Poster
This presentation will report results of high gradient testing of two C-band accelerating cavities fabricated at Los Alamos National Laboratory (LANL). LANL has successfully commissioned a C-band Engineering Research Facility of New Mexico (CERF-NM) which now serves for testing accelerating cavities at C-band. The test stand is powered by a 50 MW, 5.712 GHz Canon klystron and offers a unique...
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Jon Murphy (University of Michigan)11/8/22, 5:00 PM
Potential applications for laser-driven x-ray sources benefit from operation at high repetition-rate. Here, 15 mJ CPA pulses are generated at 480 Hz repetition-rate and tightly focused onto a gas target for the generation of K$_\alpha$ x-rays from a number of noble gases. The continuously-flowing nature of the gas jet meant that the target density was below the threshold for clustering and...
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Isabella Pagano (UT Austin/LLNL)11/8/22, 5:00 PM
We aim to develop a diagnostic capable of high spatio-temporal resolution, specifically to be used in High Energy Density Science (HEDS) experiments. A Self-Modulated laser wakefield acceleration (SM-LWFA) driven broadband X-ray source was observed at the Titan target area, Jupiter Laser Facility. The spectral range was between 10 KeV to > 1 MeV, and took advantage of Betatron, Inverse Compton...
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Joseph Natal11/8/22, 5:00 PM
Producing stable particle beams with Laser Plasma Accelerators depends upon the stability of the driving laser (for example, in pointing). Vibrations from various sources (HVAC systems, chillers, motorized stages, among others) introduce laser pointing fluctuations which couple to the particle beam production, and degrade shot-to-shot stability. Luckily, active stabilization is an option, even...
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Jason Brooks11/8/22, 5:00 PM
Plasma waveguides improve shot-to-shot consistency of laser wakefield accelerators (LWFAs) and extend acceleration length to multiple Rayleigh ranges. Recent work [1] has explored the use of waveguides down to low 1e17cm$^{-3}$ densities and accelerated electron energies up to 5 GeV. Both experimentally and through simulations we will combine waveguide generation techniques with a separate...
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Bo Miao (University of Maryland, College Park)11/8/22, 5:00 PM
Laser plasma accelerators can generate acceleration gradients of 10~100 GeV/m and have delivered multi-GeV electron beams. In a recent experiment, we demonstrated electron acceleration up to 5 GeV in a 20-cm plasma waveguide, formed via self-waveguiding pulses in a low density hydrogen gas jet [1,2]. The long optical guiding of multi-100 TW pulses causes complex evolution of the laser driver...
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Heather Andrews (Los Alamos National Laboratory)11/8/22, 5:00 PM
There is increasing interest in developing accelerator technologies for space missions, particularly for fundamental science. In order to meet these mission needs, key accelerator technologies must be redesigned to be able to function in a remote and harsh environment. In this work we focus on a modest electron injector system, specifically the traditional thermionic cathode. Typically such...
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Jiayang Yan (Stony Brook University)11/8/22, 5:00 PM
Plasma wakefield accelerators (PWFA) have demonstrated acceleration gradients of tens of GeV per meter. For injecting high-quality electron beams, a method called beam-induced ionization injection (B-III) is proposed. In this method, the drive beam field increases as its slice envelope oscillates to its minimum value due to the betatron oscillation and releases impurity plasma electrons that...
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Mohamed Othman (SLAC NATIONAL ACCELERATOR LABORATORY)11/8/22, 5:00 PMWG3 Poster: Laser and High-Gradient Structure-Based AccelerationContributed Poster
THz-frequency accelerating structures could provide the accelerating gradients needed for next generation particle accelerators with compact, GV/m-scale devices. Current THz accelerators are limited by significant losses during transport of THz radiation from the THz source to the acceleration structure. In addition, the broadband spectral properties of high-field laser-driven THz sources make...
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Michael Zepp (University of Wisconsin - Madison)11/8/22, 5:00 PM
A moderately high plasma density (>$10^{20}$ m$^{-3}$) with very high axial uniformity is needed to achieve wakefield acceleration of electrons in the GV/m range in AWAKE plasmas. While helicon plasmas are capable of reaching sufficient densities at the beginning of a 5 ms pulse, it is not known if they meet the strict uniformity requirement of 0.25% for use in AWAKE. Laser induced...
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Felipe Peña (DESY/UHH)11/8/22, 5:00 PM
Beam-driven plasma-wakefield acceleration has the potential to reduce the size and construction cost of large-scale accelerator facilities, by providing accelerating fields orders of magnitude greater than that of conventional accelerating structures. To keep the running costs affordable, high energy-transfer efficiency from the wall-plug to the accelerated bunch has to be demonstrated. For...
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Hao Ding (LBNL)11/8/22, 5:00 PM
Few-cycle laser pulse generation [1] is an enabling technology for making the most compact laser-plasma accelerators. Few-cycle pulses are usually generated by spectral broadening and subsequent compression of originally 30-40 fs long laser pulses. One common spectral broadening approach is via self-phase modulation in a noble gas-filled hollow-core fiber. Using this technique, we have...
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Grace Kim (Stony Brook University)11/8/22, 5:00 PM
Meter scale plasma channels are a crucial component of plasma wakefield accelerators. Creating a meter-scale plasma requires distributing the energy of the laser over that length while maintaining a high local intensity along the channel. One method for generating such a channel is by using a method known as the “flying focus”. Flying focus uses a diffractive optic on a chirped laser pulse, so...
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Maxwell LaBerge11/8/22, 5:00 PM
Electron beams exiting laser wakefield accelerators (LWFAs) can have complicated substructures based on injection and interactions with the laser and accelerating cavity. Such structures could effectively pre-bunch the beam for a free electron laser (FEL). This would not only shorten the undulator length necessary for self-amplified spontaneous emission, but also improve the longitudinal...
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Patric Muggli (Max-Planck-Institut for physics)11/8/22, 5:00 PM
Measuring the amplitude of plasma wakefields is challenging. It is however essential for AWAKE [1], since the proposed self-modulation mechanism suggested to drive large amplitude wakefields [2] with a long particle bunch must be seeded to be reproducible in phase [3,4] and in amplitude. Also, the amplitude of the wakefields evolves significantly during the growth of the self-modulation...
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Audrey Farrell (UCLA)11/8/22, 5:00 PM
Optical Thomson scattering is now a mature diagnostic tool for precisely measuring local plasma density and temperature. These measurements typically take advantage of a simplified analytical model of the scattered spectrum, which is built upon the assumption that each plasma species is in equilibrium and Maxwellian. However, this assumption fails for plasmas produced using high field...
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Rafi Hessami (SLAC National Accelerator Laboratory)11/8/22, 5:00 PM
The ongoing Plasma-driven Attosecond X-ray source experiment (PAX) at FACET-II aims to produce coherent soft x-ray pulses of attosecond duration using a Plasma Wakefield Accelerator [1]. These kinds of X-ray pulses can be used to study chemical processes where attosecond-scale electron motion is important. As a future upgrade to this concept, we investigate scaling to shorter soft X-ray...
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Spencer Kelham (Northern Illinois University Graduate Student)11/8/22, 5:00 PM
The measurement and recording of terahertz (THz) electric fields is of special interest to beam physics, as the electric fields of temporally short relativistic electron bunches have frequency components that extend into the THz range. These frequency components are challenging to measure using conventional methods, as this range of frequencies are too high for electronic systems, and are too...
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Walter Lynn (UCLA)11/8/22, 5:00 PM
Relativistic charged-particle beams which generate intense longitudinal fields in accelerating structures also inherently couple to transverse modes. The effects of this coupling may lead to beam break-up instability, and thus must be countered to preserve beam quality in applications such as linear colliders. Beams with highly asymmetric transverse sizes (flat-beams) have been shown to...
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Dr Michael Stumpf (Heinrich-Heine-Universität Düsseldorf, Institut für Laser- und Plasmaphysik)11/8/22, 5:00 PM
We present different possible ionization volumes/shapes inside a Plasma Wakefield to realize the Trojan Horse Injection method. Our all-optical setup uses tailoring of the laser near field to produce an adjusted laser focus profile and therefore an optimized ionization volume and state. Different initial beam profiles show different behaviors in our simulations hence we showcase various...
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Finn Kohrell (LBNL)11/8/22, 5:00 PM
The mission to achieve free electron lasing using electron bunches generated from an LPA source calls not only for exceptionally high quality and stability in electron beam properties, but also tunability of the laser-plasma interaction and therefore the particle beam parameters. As an alternative to self-trapping, utilizing a density down-ramp in the gas jet density profile has gained a lot...
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Liam Pocher (University of Maryland)11/8/22, 5:00 PM
One of the Grand Challenges identified by the Office of High Energy Physic relates to the use of virtual particle accelerators for beam prediction and optimization. Useful virtual accelerators rely on efficient and effective methodologies grounded in theory, simulation, and experiment. Typically, virtual accelerators are created using either computationally expensive simulations or black box...
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Jihoon Kim (School of Applied and Engineering Physics, Cornell University)11/8/22, 5:00 PM
An intense laser pulse propagating inside a plasma can generate a plasma bubble that can trap, accelerate, and focus electrons. These plasma bubbles undulate transversely according to its Carrier-Envelope-Phase (CEP) when (1) it is a near-single-cycle (NSC) pulse or (2) it undergoes steepening and forms a shock-like front. We demonstrate how this effect can be harnessed to control injection...
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Daniel Younis (University of Rochester, Department of Physics & Astronomy)11/8/22, 5:00 PM
We investigate the photoelectron spin characteristics when hydrogenic ions are centro-symmetrically irradiated with converging vector waves — a non-paraxial form of structured light. A photon with given total angular momentum $j$ and azimuthal mode number $m$ generates photoelectrons with both helicities, in contrast to the fixed helicity produced by left- or right circularly polarized light....
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Jacob Pierce (UCLA)11/8/22, 5:00 PM
Furthering our understanding of many processes in plasma physics, including laser-wakefield acceleration and laser-driven ion acceleration, requires large-scale kinetic simulations using particle-in-cell (PIC) codes. However, these simulations are extremely demanding, requiring that contemporary PIC codes be designed to efficiently use a new fleet of exascale computing architectures, which are...
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Daniel Matteo (UCLA Department of Electrical Engineering)11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesStudent Poster
High-power long-wavelength infrared lasers (e.g. CO$_{2}$ laser) are of great interest for acceleration of electrons and ions. For LWFA, pulses as short as 300-500fs are required to drive relativistic plasma wakes at 10$^{16}$-10$^{17}$ cm$^{-3}$ densities. The shortest pulse length demonstrated so far in CO$_{2}$ lasers is 2ps; these multiterawatt pulses are generated using a multistage MOPA...
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Manfred Virgil Ambat (University of Rochester, Laboratory for Laser Energetics)11/8/22, 5:00 PM
In a laser wakefield accelerator, the ponderomotive force of an intense laser pulse propagating through a plasma excites a large amplitude plasma wakefield that can trap and accelerate electrons to relativistic energies. To prevent the electrons from outrunning the accelerating phase of the wakefield, spatiotemporal pulse shaping can be used to propagate the laser intensity at the vacuum speed...
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Mohamed Othman (SLAC NATIONAL ACCELERATOR LABORATORY)11/8/22, 5:00 PMWG3 Poster: Laser and High-Gradient Structure-Based AccelerationContributed Poster
We present on the fabrication and testing of a 16-cell distributed coupling accelerator operating at 95 GHz. The π-mode standing wave cavities are designed with a side-coupled aperture that enables flexible optimization of the beampipe iris between cells. Simulations of the optimized cavity geometry predict a room temperature shunt impedance exceeding 400 MOhm/m. We also discuss techniques for...
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264. QPAD: Highly efficient quasi-static particle-in-cell algorithm based on azimuthal decompositionThamine Dalichaouch (UCLA)11/8/22, 5:00 PM
High fidelity modeling of plasma based accelerators (PBA) requires the use of 3D, fully nonlinear, and kinetic descriptions based on particle-in-cell (PIC) method. Compared to the computationally intensive full 3D explicit PIC code, the quasi-static PIC codes are able to speed up the simulations by orders of magnitude, which allows for modeling the physical problems requiring massive computing...
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Rafi Hessami (SLAC National Accelerator Laboratory)11/8/22, 5:00 PM
The ongoing Plasma-driven Attosecond X-ray source experiment (PAX) at FACET-II aims to produce soft x-ray pulses of attosecond duration with TW peak power using a Plasma Wakefield Accelerator [1]. These X-ray pulses can be used to study chemical processes where attosecond-scale electron motion is very important.
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For this first stage of the experiment, PAX plans to demonstrate that sub 100 nm... -
Qianqian Su11/8/22, 5:00 PM
QuickPIC has been an open source code since 2017 [1]. As a 3D parallel quasi-static PIC code, QuickPIC has been widely used for efficiently modeling the plasma based accelerator problems. Recently, a new field ionization module has been merged into the open source QuickPIC. Instead of the mesh ionization method, the new module is developed based on the particle ionization method, which can...
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Roland Hesse (University of Nebraska-Lincoln)11/8/22, 5:00 PM
Introducing a minimal numerical framework capable of simulating intense laser-plasma kinetic interactions. The Vlasov-Maxwell Hamiltonian system is naturally constrained to simulate driving-laser ponderomotive effects on electron and ion kinetics along the direction of laser propagation, without discarding the impact of the relativistic transverse momentum on longitudinal dynamics. Structural...
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Livio Verra (CERN)11/8/22, 5:00 PM
When a long relativistic charged particle bunch travels in plasma, it undergoes the self-modulation instability. The bunch is converted into a train of microbunches that can resonantly drive large amplitude wakefields.
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The Advanced WAKefield Experiment (AWAKE) at CERN has proven that the instability can be seeded using a relativistic ionization front copropagating within the proton bunch or... -
Jason Brooks11/8/22, 5:00 PM
At the SLAC National Accelerator Laboratory we are focusing on probing particle driven wakes on both short (100s of ps) and long (100+ $\mu$s) timescales utilizing the 10 GeV electron beamline at SLAC’s FACET II facility. Plasma shapes on the short timescales have potential applications in future positron accelerators [1] and on long timescales studies into the relaxation time of the...
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Ela Rockafellow (University of Maryland College Park)11/8/22, 5:00 PM
Recent experiments [1] have demonstrated laser wakefield acceleration (LWFA) of quasi-monoenergetic electron bunches with energy up to 5 GeV, bunch charge up to tens of picocoulombs, and beam divergence down to milliradians using 20 cm long, low density ionization-injected plasma waveguides [2] using 240 TW peak power laser drive pulses. We present 3D particle-in-cell simulation results that...
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Marco Garten (HZDR, LBNL)11/8/22, 5:00 PM
Controlling the spatio-temporal coupling of laser energy into plasma electrons is crucial for achieving predictable beam parameters of ions accelerated from ultra-high intensity (UHI) laser-driven solid density plasmas. Especially for highest maximum energies, the most promising and readily available targets are foils of a few ten to hundred nanometers thickness. When working with targets of...
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Sarah Weatherly (Illinois Institute of Technology, Argonne National Laboratory)11/8/22, 5:00 PMWG3 Poster: Laser and High-Gradient Structure-Based AccelerationStudent Poster
A method of decreasing the required footprint of linear electron accelerators and to improve their energy efficiency is utilizing short RF pulses (~9 ns) with Dielectric Disk Accelerators (DDA). A DDA is an accelerating structure that utilizes dielectric disks in its design to improve the shunt impedance. Two DDA structures have been designed and tested at the Argonne Wakefield Accelerator. ...
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Kathryn Wolfinger11/8/22, 5:00 PM
Numerical simulations of laser-plasma interactions demonstrate the generation of axially polarized electromagnetic pulses (EMPs) that radiate away energy in an initial transition state and a later steady state. This is confirmed by full 2D electromagnetic particle-in-cell simulations, as well as by a ponderomotively-driven reduced model that captures the EMP generation essentials and allows...
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49. Simultaneous Laser Temporal Shaping and Nonlinear Conversion for Driving Electron PhotoinjectorsRandy Lemons (SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Rd, Menlo Park, CA 94025, USA)11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesStudent Poster
The optimal performance of XFEL photoinjectors requires laser pulses, typically in the ultraviolet (UV), with non-Gaussian temporal intensity profiles and durations on the order of 10s of ps at photon energies higher than common ultrafast laser systems[1]. Achieving temporal shaping at these durations is non-trivial due to the limited spectral content for transform-limited (TL) pulses and a...
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Kyle Jensen (UNL, LBNL)11/8/22, 5:00 PM
Laser plasma accelerator (LPA) electron beams need to be controllably transported and focused for applications requiring coupling of high-brightness charge beams into small apertured structures, such as free-electron lasers (FEL) or high-gradient wakefield structures. A critical challenge faced by LPAs is the intrinsic shot-to-shot fluctuations in generated electron beam pointing, transverse...
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Dr Qi Tang (LANL)11/8/22, 5:00 PM
Large scale particle accelerator facilities play essential roles in advancing the frontier of particle & nuclear physics, photon science and material research. The existing software for modeling the dynamics of these particle beam that can achieve fast turn-around time is either limited to linear analysis or only provides the preliminary lattice design evaluation, while first-principle codes...
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Mr Christopher Pasquale (Univeristy of Michigan )11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesStudent Poster
Spatio-temporally synchronized light sources form the backbone of various laser plasma acceleration (LPA) experimental diagnostic tools including transverse shadowgraphy, schlieren imaging and interferometry. In common practice, electronic pulse picking or physical beam splitting are used to derive sources of synchronized ultrashort probe light from the high-power drive laser. Practical cavity...
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Mahek Logantha (Lawrence Berkeley National Lab, University of California, Berkeley)11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesStudent Poster
High-impact laser plasma accelerators (LPA) applications such as scientific discovery, medical radiation therapy, industrial and security screening require LPAs operating at kilohertz repetition rates or higher while today’s LPAs are limited to a few Hertz repetition rates. We propose coherently combining short pulse fibers to achieve highly stabilized high energy ultrashort pulses at high...
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Hongmei Tang (University of Michigan)11/8/22, 5:00 PM
Direct laser acceleration (DLA) is capable of generating super-ponderomotive energy electrons to hundreds of MeV, as well as secondary particles and radiation from high-intensity picosecond laser pulses interacting with underdense plasma. The dynamic and complex process of DLA is strongly dependent on a combination of plasma and laser parameters. Experiments performed on the OMEGA EP facility...
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Claire Hansel (University of Colorado Boulder)11/8/22, 5:00 PM
The ion channel laser (ICL) is an alternative to the free electron laser (FEL) that uses the electric fields in an ion channel rather than the magnetic fields in an undulator to transversely oscillate a relativistic electron beam and produce coherent radiation. The strong focusing force of the ion channel leads to a Pierce parameter more than an order of magnitude larger than the typical...
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Liona Fan-Chiang11/8/22, 5:00 PM
Laser plasma accelerators (LPAs) have promise to be the next generation accelerator for colliders, as well as drive a number of basic science, industry, security and medical applications. Many applications require high brightness electron beams enabled by low emittance. One proposal to achieve ultra-low emittance from an LPA is a two color laser configuration, where a long wavelength laser,...
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Ross Rudzinsky (The University of Texas at Austin)11/8/22, 5:00 PM
Smith-Purcell Radiation (SPR) is a special case of diffraction radiation produced when a charged particle passes just over the top of a grating surface. The wavelength of emitted radiation is dispersed as a function of angle and order. Laser Wakefield Accelerators (LWFAs) produce highly-energetic, temporally-short electron bunches that could provide an unusually strong, coherent, superradiant...
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Lucas Railing (University of Maryland College Park)11/8/22, 5:00 PMWG7 Poster: Radiation Generation and Advanced ConceptsContributed Poster
In previous work [1] we found that circularly polarized few-cycle pulses were more effective at accelerating low divergence, quasi-monoenergetic electron beams than their linearly polarized counterparts. These pulses were generated by sending initially elliptically polarized pulses which evolve to circular after propagation through a hollow core fiber differentially pumped with Helium and...
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David Feng (Lawrence Livermore National Laboratory)11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesContributed Poster
The application of ultrafast, high-peak power lasers for laser-driven plasma acceleration (LPA) can lead to more compact accelerators reaching sufficiently high-acceleration gradients and high particle beam energies. However, such accelerators often require tremendous electrical resources and modern commercial lasers often operate on wall-plug efficiencies less-than-30%. Coherently combined...
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Lily Berman (University of Strathclyde)11/8/22, 5:00 PM
A barrier to realizing a plasma-based XFEL is the energy chirp of the accelerated electron bunch. If such a chirp is not removed prior to extraction it is difficult to maintain bunch qualities during transport to the undulator stage, and the FEL performance will be degraded or inhibited entirely. The Trojan Horse (TH) injection method uses a plasma photocathode approach to release and trap...
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Mikhail Fedurin (Brookhaven National Laboratory)11/8/22, 5:00 PMWG8 Poster: Advanced Laser and Beam Technology and FacilitiesContributed Poster
Brookhaven Laboratory Accelerator Test Facility has a long history as a training site for graduate and undergraduate students. Young professionals are working on experiment setup during the active phases of the user program and assist engineers in design, build and repair of equipment during shutdowns.
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Stony Brook University Center for Accelerator Science and Education and City University of... -
Walter Lynn (UCLA)11/8/22, 5:00 PM
Dielectric Wakefield Acceleration (DWA) as a practical means of realizing next-generation accelerators is predicated on the ability to sustain the beam-structure interaction over experimentally meaningful length scales. This goal is complicated by the fact that the beams in question inherently couple to transverse modes in addition to the desired longitudinal modes which, if left unaccounted...
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Christopher Doss (University of Colorado Boulder)11/8/22, 5:00 PM
With the commissioning of the 10 GeV FACET-II accelerator underway, early experimental shifts of the plasma lens have been taken. These shifts use a single electron bunch propagating through a laser-ionized elongated gas jet, with an electron beam imaging spectrometer set up to disperse the beam in energy for one transverse axis and image the beam directly in the other. Currently, a laser...
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Mitchell Sinclair11/8/22, 5:00 PM
We are demonstrating an X-ray source driven by a self-modulated laser wakefield accelerator (SM-LWFA) platform to generate bright, (10^10 photon/keV/sr), high energy (10 keV - 1 MeV) X-rays for use in high energy density science (HEDS) experiments. Over the years, this X-ray platform has been developed on Titan, Omega EP, and ARC lasers. An intense picosecond laser pulse propagates into a gas...
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Tor Raubenheimer (SLAC National Accelerator Laboratory)11/9/22, 8:30 AM
Snowmass is the name for a decadal planning exercise by the US high particle physics community. It provides an opportunity for the entire particle physics community to come together to identify and document a scientific vision for the future of particle physics in the U.S. and its international partners. The Snowmass exercise takes roughly a year (2 years including the impact of Covid) and...
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Cameron Geddes (Lawrence Berkeley National Laboratory)11/9/22, 8:50 AM
Snowmass Accelerator Frontier topical group # 6, Advanced Accelerator Concepts (https://doi.org/10.48550/arXiv.2208.13279), covered new R\&D concepts for particle acceleration, generation, and focusing at ultra high acceleration gradients (GeV/m and beyond). Leveraging these to efficiently harness the interaction of charged particles with extremely high electromagnetic fields at very high...
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LK Len (DOE (retired))11/9/22, 9:10 AM
Understanding the history and evolution of a program can often provide valuable information and a foundation on which to plan a strategy for future successes. It is with this view in mind that a retrospective discussion of the General Accelerator Research and Development (GARD) program at the Office of High Energy Physics, U.S. Department of Energy, of which the Advanced Accelerator Concepts...
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11/9/22, 9:30 AM
Discussion of the AAC Vision and Future
Panel: Tor Raubenheimer, Vladimir Shiltsev, Cameron Geddes, Pietro Musumeci, Mark Hogan, and LK Len
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Siddharth Karkare11/9/22, 10:30 AM
Brightness of electron beams is directly proportional to the accelerating electric field at the cathode and inversely proportional to the mean transverse energy (MTE) of electrons emitted from photocathodes. Thus, maximizing the brightness of electron beams requires the use of lowest possible MTE photocathodes in the highest possible electric fields. While the maximum electric field is limited...
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Dan Wang (LBNL)11/9/22, 11:00 AM
One of the most promising technical paths to high-average-power, high-peak-power, ultrafast lasers is coherent combination of fiber lasers, which could produce Joule/kHz laser pulses to drive next-generation laser-plasma accelerators (LPA), e.g. kBELLA (kilohertz Berkeley Lab Laser Accelerator). Advanced controls are essential for many-beam, many-pulse coherent combination, and to optimize the...
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Dr Sergey Kutsaev (RadiaBeam Technologies, LLC)11/9/22, 11:30 AM
The advanced accelerator community is well familiar with high-risk initiatives, which has led to multi-decade development programs before concepts are realized. What is less obvious is that building an accelerator company requires continuous development on a similar time scale, and is not entirely dissimilar in nature. RadiaBeam was spun off in 2004 from UCLA's advanced accelerator laboratory,...
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Robbie Watt (SLAC)11/9/22, 1:30 PM
Accelerators are moving towards higher repetition rates with extremely high current and brightness beams.
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Advanced control techniques using machine learning are required for the optimisation and operation of such accelerators.
These techniques greatly benefit from having single-shot beam measurements.
However, high intensity beams present an issue for conventional diagnostics as they will... -
Alexander Knetsch11/9/22, 1:30 PM
Relativistic streaming plasma instabilities and their growth rates are subject of research for the description of jet-like astrophysical plasmas due to their strong influence on energy transfer between plasma-constituent, electromagnetic fields and photons. Therefore, these instabilities are of relevance in the description of highly energetic astrophysical phenomena such as e.g. the formation...
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Carlo Benedetti (LBNL)11/9/22, 1:30 PM
The viability of next generation plasma-based linear colliders relies on the possibility of accelerating high-charge and low-emittance bunches to high energies over short distances with high efficiency, while keeping a small relative energy spread. Laser-plasma accelerators (LPAs) can operate in different regimes, namely, linear (or mildly nonlinear) stages, where laser guiding is achieved by...
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Karoly Osvay (National Laser-Initiated Transmutation Laboratory, University of Szeged, Hungary)11/9/22, 1:30 PM
Most of the ion acceleration experiments have been carried out with multi-cycle, Joule-class lasers in the TNSA and RPA regime. The recent developments of few-cycle laser systems with 100 W average power created the technological basis for the generation of ion current of tens of microA consisting of ultrashort particle bunches– something that many applications dream of. Here we present an...
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Pavle Juranic (Paul Scherrer Institut)11/9/22, 1:30 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
The presentation will discuss advancements and new concepts on the topic of THz generation by 3-d printed structures in relativistic electron beams. A new concept has been developed that would greatly increase the efficiency of THz light generation, as well as allow for greater possibilities for control of the properties of the so generated Thz light. Wavelength, collimation and possibly pulse...
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Claudio Emma11/9/22, 1:45 PM
This contribution addresses recent progress in machine learning based diagnostics and optimization at the FACET-II facility at SLAC National Accelerator Laboratory. We focus the discussion around three examples: longitudinal phase space diagnostics [1-2], new algorithms for 20x speedup in optimization of beam emittance, and automated sextupole tuning to reduce minimum spot sizes in the FACET...
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Pablo San Miguel (Laboratoire d'Optique Appliquée / Instituto Superior Técnico)11/9/22, 1:50 PM
The upgraded Facility for Advanced Accelerator Experimental Tests (FACET-II) at SLAC has started delivering the first electron beams for the initial phase of several experimental campaigns hosted at the facility. During these first runs, the users have been able to test and commission different elements of their set-up, but also to obtain preliminary data to characterise the experimental...
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Sahel Hakimi (Lawrence Berkeley National Laboratory)11/9/22, 1:50 PM
The newly commissioned short focal length, high intensity beamline, named iP2, at the BELLA Center enables frontier experiments in high energy density science. This 1 Hz system provides a focused beam profile of <3 micron in FWHM, resulting in an on-target peak intensity greater than 5e21 W/cm^2 , and a pointing fluctuation on the order of 1 micron. A temporal contrast ratio of <1e-14 on the...
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Alexander Sävert (Helmholtz Institute Jena)11/9/22, 1:50 PM
We report on experiments investigating the influence of spatio-temporal couplings (STCs) in the laser focus on stimulated Raman Side Scattering. We find a discrepancy between measured scattered angles and classical theory. At the same time, the angle changes with propagation of the driving laser pulse. This mismatch can be resolved if the pulse front tilt (PFT) of the laser pulse is taken into...
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Willi Kuropka (Deutsches Elektronen-Synchrotron DESY)11/9/22, 2:00 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
ARES is a linear particle accelerator at Deutsches Elektronen-Synchrotron DESY capable of producing high-quality, low-emittance electron beams dedicated to accelerator research and development. As an introduction we will present the achieved and projected performance of the ARES linac. An overview of the research activities on ultra-short electron bunch diagnostic methods, electron imaging and...
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Ryan Roussel (SLAC National Accelerator Laboratory)11/9/22, 2:00 PM
Characterizing the phase space distribution of particle beams in accelerators is a central part of accelerator understanding and performance optimization. However, conventional reconstruction-based techniques either use simplifying assumptions or require specialized diagnostics to infer high-dimensional (> 2D) beam properties. In this work, we introduce a general-purpose algorithm that...
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Nathan Majernik11/9/22, 2:10 PM
Advanced acceleration methods based on wakefields generated by high energy electron bunches passing through dielectric-based structures have demonstrated >GV/m fields, paving the first steps on a path to applications such as future compact linear colliders. For a collider scenario, it is desirable that, in contrast to plasmas, wakefields in dielectrics do not behave differently for positron...
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Igor Pogorelsky (BNL)11/9/22, 2:10 PM
Long-wave infra-red lasers, like the TW CO2 laser at the Accelerator Test Facility (ATF), offer a number of benefits in studying laser-driven ion acceleration, including favorable scaling of the critical density, and the ability to access relativistic regimes at lower intensities. We present recent work studying hole-boring radiation pressure acceleration (HB-RPA) and collisionless shock...
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Csaba Toth (Lawrence Berkeley National Laboratory)11/9/22, 2:10 PM
After a decade-long successful operations [1] and producing new results in the field of Laser Plasma Acceleration (LPA) research [2-4] by the Berkeley Lab Laser Accelerator (BELLA), the PW laser system’s recent upgrades were completed in 2022. The first is the “Second Beamline” (PW-2BL), where the fully amplified, stretched pulses are split before compression, enabling two independently...
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Thomas Antonsen11/9/22, 2:15 PM
Design of circular lattices involves optimizing figures of merit (FoMs) characterizing the beam properties subject to the constraint that the beam distribution function be approximately periodic in trips around the lattice. We are developing an algorithm that accomplishes this with minimal computational effort. The algorithm takes advantage of recent developments in adjoint techniques that...
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Sophie Crisp (UCLA)11/9/22, 2:30 PMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
We present the latest experimental results using a dual grating dielectric laser accelerator (DLA) to modulate 6 MeV electrons. The structure is composed of two commercially available gratings, mounted independently with variable gap size controlled by 3 piezo motors. A 780 nm laser is used to drive the 800 nm periodic structure with gap size on the order of 1 um. These gratings are 4 mm long,...
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Doug Storey (SLAC National Accelerator Laboratory)11/9/22, 2:30 PM
The Near-Field Coherent Transition Radiation (NF-CTR) generated in the passage of an intense, highly compressed electron beam through a foil produces surface fields that can provide a strong self-focusing force back on the beam itself, and the intense emission of gamma-rays by the beam. This self-focusing effect can be enhanced by passing the beam through multiple foils of order micrometer...
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Dr David Bruhwiler (RadiaSoft LLC)11/9/22, 2:30 PM
High-brightness electron photoinjectors and electron linacs are fundamental to many advanced accelerator concepts and associated applications (see e.g., Ref. [1] and references therein). The industrial, medical and homeland security markets for low-to-moderate energy electron linacs are growing rapidly. To meet the design challenges for these divergent applications, with modest software...
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Alex Picksley (Lawrence Berkeley National Laboratory)11/9/22, 2:30 PM
The petawatt (PW) facility at Berkeley Lab Laser Accelerator (BELLA Center) has successfully performed several experiments since its installation in 2012 [1], primarily focusing on optimization of single stage, high energy gain laser-plasma accelerators (LPAs) [2,3]. Recently, the facility has undergone two significant upgrades: i) a new second beamline (2BL) delivered into the existing...
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James Cowley (John Adams Institute for Accelerator Science and Department of Physics, University of Oxford)11/10/22, 8:30 AMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
Many potential applications of plasma accelerators - such as light sources and future particle colliders - require the stable generation of multi-GeV electron bunches at high (>kHz) repetition rate. A consequent goal for current research into laser-driven plasma accelerators involves the development of waveguides capable of operating at densities of ~1017 cm-3, over...
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Pietro Musumeci11/10/22, 8:30 AM
In this paper we discuss the design of polarized positron source for an e+e- linear collider based on polarization transfer from circularly polarized gamma-ray photons in a conversion target. A very high flux of gamma-ray photons can be obtained via inverse compton scattering a high current ultra-relativistic electron beam with an intense laser pulse circulating in an optical cavity. In order...
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Prof. Aakash Sahai (University of Colorado Denver)11/10/22, 8:30 AM
PV/m plasmonics model pioneers extreme plasmons where the free electron Fermi gas constituted by the conduction band electrons in condensed matter is excited to its ultimate limits. Here we discuss novel physical mechanisms that begin to dominate the physics of extreme plasmons. For instance, relativistically induced ballistic electron transport helps explain earlier beam-metal interaction...
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Evgenya Simakov (LANL)11/10/22, 8:30 AMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
This talk will report on the status C-band high gradient research program at Los Alamos National Laboratory (LANL). The program is being built around two test facilities: C-band Engineering Research Facility in New Mexico (CERF-NM), and Cathodes And Radio-frequency Interactions in Extremes (CARIE). Modern applications such as X-ray sources require accelerators with optimized cost of...
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Pablo San Miguel (Laboratoire d'Optique Appliquée / Instituto Superior Técnico)11/10/22, 8:45 AM
Relativistic beam-plasma instabilities play a crucial role in high-energy astrophysical sources, such as gamma-ray bursts or blazars, in particular to create the electromagnetic turbulence responsible for the synchrotron emission of accelerated particles in these sources. These instabilities are also important in certain experimental concepts of particle accelerators or ultra-intense photonic...
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Davide Terzani (LBNL)11/10/22, 8:50 AM
Development of compact, Laser Plasma Acceleration (LPA)-based sources for positrons is a key step in the R&D effort towards development of a TeV collider. The conventional production and collection schemes of positron beams cannot be easily transferred to an LPA setup. This is mainly due to the large distance required to transport particles from the production to the acceleration point and the...
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Katinka von Grafenstein (LMU Munich)11/10/22, 8:50 AMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
For the creation of matter-antimatter pairs from the quantum vacuum via the Breit-Wheeler effect, an intense laser and energetic γ-rays need to interact with each other. At the Stanford Linear Accelerator Center the Breit-Wheeler experiment in the perturbative regime has been accomplished in 1997 but was not yet implemented in the non-perturbative regime, where the laser strength parameter...
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R Lawrence Ives (Calabazas Creek Research, Inc.)11/10/22, 9:00 AMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
Several new, high efficiency, RF sources are available or in development at frequencies from 325 MHz to 1.3 GHz and higher. If successfully developed, these new devices will represent lower cost alternatives to conventional RF sources. The primary focus is RF power production at higher efficiency and lower cost than currently available from conventional vacuum electron devices and solid-state...
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Thamine Dalichaouch (UCLA)11/10/22, 9:00 AM
The goals of plasma-based acceleration (PBA) are high gradient, high efficient acceleration and high quality beam generation. Various synchronized injection schemes utilizing PBA have been proposed and investigated to generate beams capable of driving a compact x-ray free electron laser (XFEL). In each of these ideas, the main challenge is how to maximize the energy transfer to the injected...
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159. GeV electron bunches in low-density plasma channels by all-optical density transition injectionAlex Picksley (University of Oxford)11/10/22, 9:10 AMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
Hydrodynamic [1,2] and conditioned hydrodynamic [3,4] optical-field-ionised plasma channels are promising candidates to support low-density, high repetition-rate multi-GeV laser wakefield accelerator (LWFA) stages. They are generated by focusing an ultrashort pulse into neutral gas, forming a hot column of plasma via optical field ionization, which expands hydrodynamically to form a plasma...
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164. High intensity laser driven sources of gammas and positrons using BELLA PW Laser Dual BeamlinesStepan Bulanov (LBNL)11/10/22, 9:10 AM
Recent commissioning of the second laser pulse transport line at the BELLA PW facility enables strong-field quantum electrodynamics (SF-QED) experiments where an intense laser pulse collides with a GeV-class laser-wakefield-accelerated electron beam. An overview of the upgraded BELLA PW facility with a SF-QED experimental layout is presented. According to the simulation results these...
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Qianqian Su11/10/22, 9:15 AM
Plasma-based acceleration has emerged as a promising candidate as an accelerator technology for a future linear collider or a next-generation light source. We consider the plasma wakefield accelerator (PWFA) concept where a plasma wave wake is excited by a particle beam and a trailing beam surfs on the wake. For a linear collider, the energy transfer from the drive beam to the wake and from...
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Ben Freemire (Euclid Beamlabs)11/10/22, 9:30 AMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
The future of high energy colliders beyond the high luminosity upgrade to the LHC is presently unclear. Physics and economics arguments are being made for hadrons vs. leptons and circular vs. linear machines. A muon collider is now being considered in Europe as a potential Future Circular Collider at CERN. Among the technological challenges inherent to a muon accelerator are beam cooling...
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Manh Le (University of Maryland)11/10/22, 9:30 AMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
We study the generation of spatiotemporal optical vortices (STOVs) from self-focusing processes in plasma and their role in mediating intrapulse energy transport in intense, self-guided laser pulses using fully three-dimensional, particle-in-cell simulations.
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In previous work, STOVs were observed both in experiment and in simulation to emerge from self-focusing collapse arrest from... -
Lance Hildebrand (University of California, Los Angeles)11/10/22, 9:30 AM
Beam driven plasma wakefield acceleration (PWFA) has shown the ability to accelerate electron beams with high acceleration gradients ~50 GeV/m, high efficiency, and low energy spread. This has inspired future linear collider (LC) designs where witness beams are accelerated over a series of plasma stages. In the LC regime, the witness beam emittance is ~100 nm and the charge is ~1 nC. With...
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Jorge Rocca (Colorado State University)11/10/22, 10:30 AMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
The petawatt-class multi-Hz Ti:Sa laser ALEPH developed at Colorado State University has recently enable major advances in laser wakefield acceleration [1]. However, progress on laser driven-particle accelerators for applications depends on the development of compact, more efficient lasers capable of producing of high energy ultrashort laser pulses at greatly increased high repetition rate. A...
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Robert Ariniello (SLAC National Accelerator Laboratory)11/10/22, 10:30 AM
Preserving the emittance of an electron bunch as it is accelerated by a plasma wakefield accelerator is one of the major challenges that needs to be overcome for these accelerators to replace conventional techniques. Energy spread in the bunch primarily drives the emittance growth through the process of chromatic phase spreading. The chromatic effects are complicated by the acceleration...
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Sergei Tochitsky (UCLA)11/10/22, 10:30 AM
Laser-produced ion beams from 1 um laser-plasma interactions have been a focus of high-energy density physics studies for several decades. Traditionally, these beams have been accelerated via the target normal sheath acceleration (TNSA) mechanism, which has a rootlike scaling of the maximum kinetic energy of protons Ep∞√I, where I is the laser intensity. To enhance TNSA via increase in...
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Yuri Batygin (Los Alamos National Laboratory)11/10/22, 10:30 AMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
Increasing the proton beam energy from the present 800 MeV to 3 GeV will improve the resolution of the Proton Radiography Facility at the Los Alamos Neutron Science Center (LANSCE) by a factor of 10. It will bridge the gap between the existing facilities, which covers large length scales for thick objects, and future high-brightness light sources, which can provide the finest resolution....
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Dr Alexander Debus (Helmholtz-Zentrum Dresden - Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany)11/10/22, 10:30 AM
Exascale computing is close to becoming a reality. As technology progresses, it has become clear that heterogeneous computing is going to stay and adapting to new hardware is an ongoing challenge. Since 2015 PIConGPU has paved the way to accelerating plasma simulations across compute platforms using the Alpaka framework. This has enabled early adaption to new compute hardware and readiness for...
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Carl Schroeder (LBNL)11/10/22, 10:30 AM
Plasma-based accelerators enable compact acceleration of beams to high energy and are considered a potential technology for future linear colliders. Conventional linear colliders require damping rings to generate the required beam emittance for high-energy physics applications. We propose and discuss a plasma-based linear radiation damping system that allows cooling of ultrashort bunches...
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Kook-Jin Moon (Ulsan National Institute of Science and Technology)11/10/22, 10:45 AM
The phase and growth rate of the self-modulation of a long proton bunch in over-dense plasma can be controlled by a preceding charged particle bunch. In order to selectively seed the growth of the proton bunch self-field, the dominance of seed over any undesired imperfections of the proton bunch is important. In this work, we investigate analytically and numerically the phase and growth rate...
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Severin Diederichs (DESY / LBNL)11/10/22, 10:45 AM
Modeling plasma wakefield accelerators is computationally challenging. Using the quasi-static approximation allows for efficient modeling of demanding plasma wakefield accelerator scenarios. Here, the latest highlights of the performance-portable, 3D quasi-static particle-in-cell (PIC) code HiPACE++ are presented. HiPACE++ demonstrates orders of magnitude speed-up on modern GPU-equipped...
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Austin Dick (Northern Illinois University)11/10/22, 10:50 AM
Stochastic Cooling is a feedback system for cooling particle beams in storage rings which uses radiation produced by the beam to correct the average deviation of temporal slices with a duration inversely proportional to the bandwidth. Optical Stochastic Cooling (OSC) uses optical wavelengths which decreases the duration of each slice and, therefore, reduces the incoherent noise each individual...
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Leily Kiani (LLNL)11/10/22, 10:50 AMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
High peak power laser systems with architectures that are scalable in average power are essential to drive the next generation of advanced, compact electron accelerators. For this purpose, the Big Aperture Thulium (BAT) laser concept is designed to simultaneously operate at PW-class peak powers and multi-100kW average powers through the use of an energy extraction regime that scales in...
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Emmanuel d'Humieres (CELIA, Univ. Bordeaux)11/10/22, 10:50 AM
Several setups have recently been proposed to generate ultra-short laser pulses in the 10-100 as range with high energies (0.1-10 J) and a wavelength in the EUV-X range (1-100 nm), either by broadening the spectrum of near-infrared laser pulses to obtain single-cycle pulses that can be converted to single cycle attosecond pulses by a plasma mirror, or by directly using Doppler-boosted...
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Gerard Andonian (UCLA/Radiabeam)11/10/22, 11:00 AM
The Trojan Horse experiment has recently demonstrated the plasma photocathode concept at SLAC FACET, with a two-gas mixture where on species is ionized for wakefield generation and the other for precision witness beam generation within the plasma bubble. In an experimentally similar approach called the 'Dielectric Trojan Horse', the plasma accelerator component is replaced with a solid-state...
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Sergey Kurennoy (Los Alamos National Laboratory)11/10/22, 11:00 AMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
Increasing energy of proton beam at the Los Alamos Neutron Science Center (LANSCE) from 800 MeV to 3 GeV will improve radiography resolution ~10 times. This energy boost can be achieved with a compact cost-effective linac based on normal conducting high-gradient (HG) RF accelerating structures. Such an unusual proton booster is feasible for proton radiography (pRad), which operates with short...
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Jean-Luc Vay (Lawrence Berkeley National Laboratory)11/10/22, 11:00 AM
The electromagnetic Particle-In-Cell (PIC) code WarpX has been developed within the the U.S. Department of Energy’s Exascale Computing Project toward the modeling of plasma accelerators for future high-energy physics colliders on Exascale Supercomputers. We will present the latest multi-GPU capable physics features, such as a Coulomb collision module and a QED module. We will also report on...
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Maxwell LaBerge11/10/22, 11:10 AM
Recent breakthroughs in laser wakefield accelerator (LWFA) technology have allowed them to drive free-electron lasers (FELs) [1]. This is made more impressive by the relative lack of phase-space control in plasma accelerators when compared to conventional linear accelerators. However, the complicated phase spaces and microstructures in LWFA beams could be harnessed to accelerate the...
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Igor Pogorelsky (BNL)11/10/22, 11:10 AM
Ultra-intense lasers are the driving force of the advanced accelerator research (AAR). Extension of their spectral reach from the presently achievable near-IR into the long-wave IR (LWIR) domain opens opportunities to explore new regimes of particle acceleration, gaining deeper insight into laser-plasma interactions, and improve laser accelerator parameters. Longer laser wavelength facilitates...
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William Li (Brookhaven National Laboratory)11/10/22, 11:10 AMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
The long wavelength of long-wave infrared (LWIR) lasers suit them to applications relying on ponderomotive interactions, such as laser wakefield acceleration and high harmonic generation. The workhorse source of such wavelengths is the CO2 amplifier, providing the ability to reach TW peak powers and sub-ps pulse lengths. Two pathways to improve the performance of these amplifiers are to...
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Qianqian Su11/10/22, 11:15 AM
The PWFA has emerged as a promising candidate for the accelerator technology used to build a future linear collider and/or light source. In this scheme witness beams are accelerated in the plasma wakefield created by a driver beam. The three-dimensional (3D) quasi-static (QS) particle-in-cell (PIC) approach, e.g., using QuickPIC, has been shown to provide high fidelity simulation capability...
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Prof. Aakash Sahai (University of Colorado Denver)11/10/22, 11:15 AM
A new paradigm of extreme plasmonics unearthed by our work opens the unprecedented possibility of PetaVolts per meter fields that make it possible to access 1,000,000 times the acceleration gradient in RF accelerators. Plasmonic accelerators and light-sources put forth in our work rely on these extreme plasmons over timescales where the ionic-lattice remains largely unperturbed. A specific...
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Prof. Gaetano Fiore (INFN, Sezione di Napoli, and Università Federico II, Napoli)11/10/22, 11:30 AM
Adopting a recently developed simplified model of the impact of a very short and intense laser pulse onto an inhomogeneous diluted plasma, we analitycally derive preliminary conditions on the input data (initial plasma density $\widetilde{n_0}$ and pulse profile) allowing to control the wave-breaking of the laser-driven plasma wakefield and to maximize the energy transfer to small bunches of...
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Mr Jeroen Van Tilborg (Lawrence Berkeley National Laboratory)11/10/22, 11:30 AM
Laser plasma accelerators (LPAs) are capable of producing electron bunches as short as a few femtoseconds at percent-level energy spread. However, measuring the bunch length is not straightforward, let alone unraveling source correlations between the longitudinal position and momentum distribution. Here we present the theoretical framework and preliminary experimental demonstration of a...
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Tom Katsouleas (U of Ct)11/10/22, 11:30 AMWG3 Oral: Laser and High-Gradient Structure-Based AccelerationContributed Oral
The possibility of exciting wakefields in a semi-conducting structure is discussed. The fundamental limitation of short mean free paths of electrons in the semi-conductor can be overcome above a threshold beam or laser driver intensity when the electrons are driven to sufficient velocities that their Coulomb collision cross-section drops precipitously. The wakes differ from those in either a...
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Dr Sergei Tochitsky11/10/22, 11:30 AMWG8 Oral: Advanced Laser and Beam Technology and FacilitiesContributed Oral
Multiple advanced accelerator concepts such as electron and ion acceleration from plasmas, inverse FEL’s, and Compton sources would benefit from the development of high-repetition-rate and short-pulse but high-energy mid-IR lasers. However, this intense-field mid-IR is still extremely difficult to access, since solid-state laser sources in this spectral region are limited in power. CO2 lasers...
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Pietro Musumeci11/10/22, 11:30 AM
Advanced accelerator techniques based on collinear wakefield accelerations have demonstrated the capability of achieving very high accelerating fields. These schemes are based on passing a high charge driver electron beam in a plasma or near field structure which results in high rate energy extraction. In this process a strong wakefield is left behind that can be used for high gradient...
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Valentina Lee (University of Colorado, Boulder)11/10/22, 11:45 AM
The stability of the drive electron beam in plasma wakefield acceleration (PWFA) is critical for the realization of many applications. The growing instability of a drive electron beam can couple into the plasma wake and further impact the transverse dynamics of the witness beam, rendering the emittance and energy spread to grow. Applications like positron acceleration in an electron-driven...
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Prof. B. A. Shadwick (Univ of Nebraska - Lincoln)11/10/22, 1:30 PMWG2 Oral: Computation for Accelerator PhysicsContributed Oral
An Eulerian finite-difference method solving the Vlasov equation is developed with a static, non-uniform momentum grid. The computational cost of this transformation differs negligibly from the uniform case with the same number of grid points. A general grid parametrization is tested against classic instabilities and driven cases and is found to provide significant efficiencies over the...
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Alexander Knetsch11/10/22, 1:30 PM
Owing to the provision of GV/m accelerating fields, beam-driven plasma accelerators are a promising technology for the miniaturization of particle accelerators. Energy gains of GeV or even tens of GeV are already achievable so to extend this range to 0.1 - 1 TeV, a sequence of multiple plasma stages is being considered.
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While plasma-accelerator stages itself are sufficiently small,... -
Dr Jay Hirshfield (Omega-P R&D, Inc.)11/10/22, 1:30 PM
A new concept for a high-power L-band RF amplifier is described, namely a Two-Stage Multi Beam Klystron (TS-MBK) operating with 12 hollow beamlets. This configuration allows for a remarkably high RF electronic efficiency of up to 90%, with a compact electro-mechanical layout. We present a conceptual design for a 1.0 GHz, 20 MW peak-power TS-MBK; its predicted performance was determined using...
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Andrew Sutherland (University of Strathclyde)11/10/22, 1:30 PMWG5 Oral: Beam Sources, Monitoring, and ControlContributed Oral
Reliable and versatile diagnostic methods are essential for modern accelerator facilities to successfully experiment with energetic particle bunches. Conventionally, an expansive network of tools is implemented in and around interaction points for optimization of experimental conditions; this is true for plasma-based accelerator experiments, with added restrictions to intercepting diagnostics...
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Yong Ma (University of Michigan)11/10/22, 1:30 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
We report on a single-shot longitudinal phase-space reconstruction diagnostic for an electron beam in a laser wakefield accelerator via the experimental observation of distinct periodic modulations in the angularly resolved spectrum. Such modulated angular spectra arise as a result of the direct interaction between the ultra-relativistic electron beam and the laser driver in the presence of...
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Kathleen Weichman (University of Rochester Laboratory for Laser Energetics)11/10/22, 1:45 PMWG2 Oral: Computation for Accelerator PhysicsContributed Oral
Numerical modeling of electromagnetic waves is a critical component of particle-in-cell simulation of laser–plasma interactions. Traditionally, laser pulses have been either launched from simulated antennas or initialized in their entirety in the computational domain. Relying on the electromagnetic field update to advance the laser pulse, however, imposes needless computational expense and...
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Yujian Zhao11/10/22, 1:48 PM
Plasma based acceleration (PBA) is being considered as a building block for a future linear collider (LC). In PBA a short pulse laser or particle beam creates a wakefield and a witness particle beam is accelerated in the wakefield. As the witness beam is accelerated its energy spread must be small and its emittance must be preserved. In some designs the witness beam parameters required by a...
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Mr André Antoine (University of Michigan)11/10/22, 1:50 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
Laser Wakefield Acceleration (LWFA) is a process by which high gradient plasma waves are excited by a laser leading to the acceleration of electrons. The process is highly nonlinear leading to difficulties in developing 3 dimensional models for a priori, and/or ab initio prediction.
Recent experiments at the Rutherford Appleton Laboratory’s (RAL) Central Laser Facility (CLF) in the United...
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Dr Jay Hirshfield (Particle Accelerator Research Foundation and Omega-R&D, Inc.)11/10/22, 1:50 PM
Solutions of the single-particle equations of motion for electrons in the fields of an idealized TE111 microwave cavity in an external magnetic field near cyclotron resonance show acceleration rates that substantially exceed the limits for the CARA interaction. We have dubbed this new accelerator “eCRA.” Here, results are presented for realistic TE111 eCRA cavity geometry and finite...
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Nathan Majernik11/10/22, 1:50 PMWG5 Oral: Beam Sources, Monitoring, and ControlContributed Oral
A method to reconstruct the transverse self-wakefields acting on a beam, based only on screen images, is introduced. By employing derivative-free optimization, the relatively high-dimensional parameter space can be efficiently explored to determine the multipole components up to the desired order. This technique complements simulations, which are able to directly infer the wakefield...
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Dr Daniel Gordon (U.S. Naval Research Laboratory)11/10/22, 2:00 PMWG2 Oral: Computation for Accelerator PhysicsContributed Oral
By using the spinor representation of four-vectors, it is possible to write a simple expression for the momentum change of a charged particle in an arbitrary crossed field. It can be evaluated exactly if transcendental function evaluations are tolerable, or in an invariant-preserving expansion otherwise. We discuss progress in incorporating this approach into a particle-in-cell framework.
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Pratik Manwani (University of California, Los Angeles)11/10/22, 2:06 PM
Particle beams with highly asymmetric emittance ratios are employed at accelerator facilities and are expected at the interaction point of high energy colliders. These asymmetric beams can be used to drive wakefields in dielectric structures and can be used to drive high gradient wakefields in plasmas. In plasma, the high aspect ratio of the drive beam can create a transversely elliptical...
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Mikhail Polyanskiy (Brookhaven National Laboratory)11/10/22, 2:10 PM
The ATF's long-wave infrared (LWIR) laser produces optical pulses that enable substantially different acceleration regimes compared to near-infrared lasers. A 2 ps pulse duration and 5 TW peak power at 9.2 μm are presently the best demonstrated performance of this laser. This is achieved via chirped-pulse amplification of a microjoule seed pulse in a series of two high-pressure, mixed-isotope...
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Andreas Seidel (Friedrich-Schiller-University Jena)11/10/22, 2:10 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
We have conducted experiments at the JeTi-200 laser facility ($\lambda_0=800nm$, spotsize $w_0=22\mu m$, pulse length $\tau=23 fs$, $a_0 = 2.4$) to investigate the contribution of laser polarization and carrier envelop phase (CEP) -fluctuations on the electron beam pointing jitter in laser wakefield accelerators(LWFAs). Furthermore, we developed a theory describing the transverse dynamics of...
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Aiqi Cheng (Stony Brook University)11/10/22, 2:15 PMWG2 Oral: Computation for Accelerator PhysicsContributed Oral
An efficient numerical algorithm for multi-level ionization of high-atomic-number gases has been developed. It is based on analytical solutions to the system of differential equations describing evolution of ionization states. The algorithm fully resolves multiple time scales associated with ionization processes coupled to electromagnetic processes of laser-plasma interaction. The effects of...
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Prof. Gennady Shvets (Cornell University)11/10/22, 2:24 PM
Plasma wakefields produced by high-charge electron bunches are attractive for lepton colliders because they combine high-gradient acceleration and, in the regime of full electron blowout, emittance preserving linear focusing of the accelerated electrons by the remaining positively charged ions. Achieving the same for positrons is more challenging because it requires producing a uniform...
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Dr Klaus Steiniger (Helmholtz-Zentrum Dresden-Rossendorf)11/10/22, 2:30 PMWG2 Oral: Computation for Accelerator PhysicsContributed Oral
We present EZ, a novel Current Deposition algorithm for particle-in-cell simulations, which calculates the current density on the grid due to macro-particle motion within a time step by solving the electrodynamic continuity equation. Being a charge conserving hybridization of Esirkepov’s method and ZigZag, we refer to it as “EZ” as shorthand for “Esirkepov meets ZigZag”.
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The talk will detail... -
Igor Pogorelsky (BNL)11/10/22, 2:30 PM
Over last three decades, BNL Accelerator Test Facility (ATF) pioneered the concept of a proposal-based user facility for lasers and electron beam-driven advanced accelerator research (AAR). This has made ATF, operating as an Office of Science National User Facility and a flagship DOE facility in Accelerator R&D Stewardship, an internationally recognized destination for researchers who benefit...
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Qiang Chen (Lawrence Berkeley National Laboratory)11/10/22, 2:30 PMWG1 Oral: Laser-Plasma Wakefield AccelerationContributed Oral
Colliding pulse injection of electron beams into a laser plasma accelerator (LPA), thus producing compact, stable, and monoenergetic electron beams, has important applications for narrow bandwidth Thomson gamma ray sources and novel x-ray free-electron lasers. The colliding laser pulses are independently optimized in terms of energy, beam size, and pulse compression. The spatiotemporal...
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Spencer Gessner (SLAC)11/10/22, 2:42 PM
The AAC community proposed linear collider concepts with energies extending to 15 TeV center-of-mass and luminosities up to 50E34 cm^-2 s^-1 as part of the Snowmass process. The beam power required to reach these energies and luminosities is prohibitive. We discuss the results of initial investigations of strategies to increase luminosity per beam power, a key figure-of-merit for linear colliders.
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Mohamed Othman (SLAC NATIONAL ACCELERATOR LABORATORY)11/11/22, 8:30 AM
C3 – the Cool Copper Collider – is a concept for a e+e− Higgs factory at 250 GeV center of mass, with a potential upgrade to 550 GeV in the same footprint. C3 leverages novel advancements in high-gradient cryogenic copper accelerator structures which operate with high rf to beam efficiency. The C3 main linac requires significant R&D effort for the rf and cryogenic systems, beam delivery, and...
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Liling Xiao (SLAC)11/11/22, 9:00 AM
ACE3P is a comprehensive set of parallel finite-element codes for multi-physics modeling of particle accelerators. Running on massively parallel computer platforms for high fidelity and high accuracy simulation, ACE3P enables rapid virtual prototyping of accelerator rf component design, optimization, and analysis. Recent advances of ACE3P have been achieved through the implementation of...
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Dr Agostino Marinelli (SLAC National Accelerator Laboratory)11/11/22, 9:30 AM
Attosecond science has emerged as a major research direction in X-ray free-electron laser science. X-ray free-electron lasers can routinely generate attosecond pulses with a peak power in the tens to hundreds of GW and are employed for time-resolved experiments with sub-fs resolution.
Plasma-based injectors have the potential revolutionize ultrafast science thanks to their ability to...
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11/11/22, 10:30 AM
Announcement of Student Poster Award Winners
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11/11/22, 10:35 AM
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11/11/22, 10:45 AM
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11/11/22, 10:55 AM
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11/11/22, 11:05 AM
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11/11/22, 11:15 AM
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11/11/22, 11:25 AM
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11/11/22, 11:35 AM
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11/11/22, 11:45 AM
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Yong Ma (University of Michigan), Marlene Turner (LBNL), Irina Petrushina (Stony Brook University)11/11/22, 1:00 PMContributed Oral
Laser-Plasma Wakefield Acceleration
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David Bruhwiler (RadiaSoft LLC), Alexey Arefiev (UC San Diego)11/11/22, 1:25 PMContributed Oral
Computation for Accelerator Physics
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Sergey Belomestnykh (Fermilab), Xueying Lu (NIU / ANL)11/11/22, 1:50 PMContributed Oral
Laser and High-Gradient Structure-Based Acceleration
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Jens Osterhoff (DESY), Spencer Gessner (SLAC)11/11/22, 2:15 PM
Beam-Driven Acceleration
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Yine Sun (Argonne National Laboratory), Dr Samuel Barber (Lawrence Berkeley National Laboratory)11/11/22, 3:00 PMContributed Oral
Beam Sources, Monitoring, and Control
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Dr Lieselotte Obst-Huebl (Lawrence Berkeley National Lab), Dr Igor Pogorelsky (BNL), Mamiko Nishiuchi (QST)11/11/22, 3:25 PMContributed Oral
Laser-Plasma Acceleration of Ions
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John Palastro (University of Rochester, Laboratory for Laser Energetics), Julia Mikhailova11/11/22, 3:50 PMContributed Oral
Radiation Generation and Advanced Concepts
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Stephen Milton, Mr Marcus Babzien (BNL)11/11/22, 4:15 PMContributed Oral
Advanced Laser and Beam Technology and Facilities
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11/11/22, 4:40 PM
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Mark Palmer (Brookhaven National Laboratory)11/11/22, 4:50 PM
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Jon Murphy (University of Michigan)
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