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Emily FramePoster
A path to producing bright electron beams consists of low mean-transverse-energy photocathodes subjected to a high electric field. Such an approach is currently being explored at the AWA facility where a proof-of-principle experiment recently demonstrated the reliable operation of an X-band radiofrequency (XRF) gun with $\sim 0.4$-GV/m electric field on the photocathode surface*. This paper...
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Gevy J. CaoPoster
Plasma accelerators for future linear lepton colliders have been considered as a potential upgrade in accelerator technology. However, in recent years, the challenge in accelerating positrons in plasma has diverted much attention to other collider options. Many new ideas emerged with the concept of modifying the plasma or the drive beam to overcome this challenge. In this contribution, we...
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Joshua MannPoster
Strong laser-field emission from metals is a growing area of study owing to its applications in high-brightness cathodes and potentially as a high harmonic generation source. Nanopatterned plasmonic cathodes localize and enhance incident laser fields, reducing the spot size and increasing current density. Experiments have demonstrated that the nanoblade structure outperforms nanotips in the...
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Dr Alberto Bacci (INFN MIlan)Poster
Currently, Energy Recovery Linacs (ERLs) are gaining popularity due to their environmentally friendly and sustainable nature.
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However, ERLs require a specialized low-energy injector, also known as a merger. The energy exiting the merger cannot be recycled and is ultimately dumped at the end of the process.
To maximize energy efficiency, it is necessary to reduce injection energy. However, a... -
James RosenzweigPoster
Space charge forces are a major contributing factor that adversely affect beam quality in an RF-injector. The laser distribution sent to the photocathode plays a crucial role in the emittance compensation process, as evidenced by slice analysis. To derive self-induced force expressions for bunches with arbitrary charge distributions, a new model of space charge forces has been proposed. The...
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Pratik Manwani (University of California, Los Angeles)Poster
Flat or transversely asymmetric beams create transversely asymmetric wakefields. These wakefields are characterized by the creation of an elliptical cavity created by the evacuated plasma electrons and remnant ions. The potential inside these elliptical cavities is quadratic and yields transverse electric fields that are linear. Particle beams inside the blowout cavity can be matched to these...
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James Jones (STFC Daresbury Laboratory)Poster
RUEDI is a proposed Relativistic Ultrafast Electron Diffraction and Imaging facility for the UK. It will deliver single-shot time-resolved imaging with MeV electrons, as well as ultrafast electron diffraction at 10 fs timescales. The few-MeV-scale imaging and microscopy line aims to deliver high charge (up to 10^8 electrons), ultra-low emittance electron bunches to a 10µm sample with minimal...
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Benjamin Hounsell (STFC Daresbury Laboratory)Poster
RUEDI is a proposed facility for ultrafast electron microscopy (UEM) and ultrafast electron diffraction (UED) which is currently being designed and would be built in the UK. It will have two beamlines, one for microscopy and one for diffraction, which share a common electron gun. The diffraction beamline will operate with a kinetic energy of 4 MeV meaning that both space charge and ballistic...
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Gilles Jacopo Silvi (Istituto Nazionale di Fisica Nucleare - Sez. Roma 1)Poster
The EuPRAXIA@SPARC_LAB RF injector provides high brightness electron beams accelerated and longitudinally manipulated in the velocity bunching regime (VB). The RF injector consists of a SPARC_LAB like S-band RF Gun (2.856 GHz) followed by four S-band TW accelerating structures with an overall length of 12.3 m. The RF injector works with the so called comb configuration, foresees a 30pC witness...
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MONIKA YADAV (University of Liverpool)Poster
Betatron radiation spectroscopy is a valuable diagnostic technique for studying the interaction between a beam and a plasma in plasma wakefield acceleration (PWFA) experiments. In this project, we investigate the effects of beam perturbations on the betatron radiation. We analyze how perturbations can result in hosing, a transverse instability that can degrade the quality of the beam. We also...
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Michael Litos (University of Colorado Boulder)Poster
We present the first analytic theoretical model describing the chromatic transverse dynamics of an electron beam in a nonlinear plasma-based accelerator that can account for the evolution of the projected, longitudinal sliced, and energy sliced emittance. Beginning with a description of single particle motion, the evolution of the beam moments and centroid position for each slice is...
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Oliver Williams (UCLA)Poster
We present the first results of commissioning of the S-Band hybrid photoinjector at the new accelerator facility at UCLA. Thorough characterization of the photoinjector is needed before installation of additional accelerating sections. These include measurements of high power RF cavity response, charge, beam energy, and bunch length. Of particular interest in this first round of studies is...
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Auralee Edelen (SLAC)Poster
Transverse beam emittance plays a key role in the performance of high brightness accelerators. Characterizing beam emittance is often done using a quadrupole scan, which fits beam matrix elements to experimental measurements using first order optics. Despite its simplicity at face value, this procedure is difficult to automate due to practical limitations. Key issues that must be addressed...
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Gevy J. CaoPoster
Most theoretical and simulation studies on plasma accelerators are performed with the assumption of cold plasma. However, with recent development in high-rep-rate acceleration in plasma, heat deposition from high-power, high-frequency beams can easily increase the ambient plasma temperature. Plasma electrons, given an initial momentum, have a locally "smeared out" distribution compared to the...
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Andrea Renato Rossi (INFN - Milan)Poster
The EuAPS project (EuPRAXIA Advanced Photon Source) aims at realizing an X-ray photon source for users applications. The photons will be produced by betatron radiation mechanism inside a laser plasma accelerator, exploiting an internal injection scheme. The source will produce short pulses of photons in the spectral range 1 - 10 keV for a wide set of applications ranging from imaging to...
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Dr Faya Wang (SLAC)Poster
Effective resonance control of superconducting radio frequency (SRF) cavities is critical for large machines like LCLS-II, as failure to achieve proper control can result in increased RF power consumption, higher cryogenic heat loads, and increased costs. To address this challenge, we have developed a machine learning (ML) model based on the dynamic mode decomposition method (DMD) to represent...
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Sophie Crisp (UCLA)Poster
We present experimental results using a tunable commercial dual grating dielectric laser accelerator (DLA). A 780 nm, 100 fs pulsed laser is used in a pulse-front-tilt configuration to maximize interaction length to an observed length of more than 750 um and energy gain of 150 keV. The two gratings are mounted independently with piezo controls, allowing structure tuning for maximal energy...
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Dr Alberto Bacci (INFN MIlan)Poster
ASTRA is a well-known tracking code able to simulate with high accuracy space charge dominated beams dynamics.
GIOTTO, on the other hand, is an AI code (based a genetic algorithm) used to optimize beam dynamics in the presence of strong nonlinear correlations, such as those introduced by space charge forces or more generally by complex collective effects.GIOTTO was designed to natively...
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Eric CroppPoster
The FAST beamline is the injector for the under-construction Gamma-Ray Electron ENhanced Source (GREENS), which promises numerous scientific advances [1]. FAST-GREENS requires high 5-D peak brightness; transverse normalized projected emittances of 3 mm-mrad and a peak current of 600 A are the minimum nominal beam requirements for the FEL to lase. In this work, studies of the low energy...
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Andrea Frazzitta (INFN)Poster
X-rays production through betatron radiation emission from electron bunches is a valuable resource for various research fields. The EuAPS (EuPRAXIA Advanced Photon Sources) project, within the framework of the EuPRAXIA project, aims to provide 1-10 keV photons (soft X-rays) using a compact plasma-based system designed to exploit self-injection processes that occur in laser-plasma interaction...
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Obed Camacho (UCLA)Poster
The present study examines an approach for calculating intrabeam scattering (IBS) effects in a high-brightness electron beams, based on a thermodynamic model that considers slice-to-slice temperature variations within the bunch. Despite advances in computing, the estimation of granular space-charge effects in photoinjectors remains largely intractible for non-trivial bunch charges without...
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Eduard Prat (Paul Scherrer Institut)Poster
We present measurements of the slice energy spread of the electron beam using two methods. The first and more standard way consists in measuring the slice beam size of the electrons in a dispersive location. The second method is based on the optical klystron mechanism, where the radiation produced in undulator modules is enhanced with magnetic chicanes between the modules. In this approach,...
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Simona Borrelli (Eindhoven University of Uechnology)Poster
Measuring the fermion statistics of free electrons has been a considerable experimental challenge of fundamental interest for many years. The attempts up to now, such as by Tonomura, have remained inconclusive because of the limited temporal resolution of the available detectors. The fermion statistics experimentally show up as electron anti-bunching - i.e., as a changed coincidence rate on a...
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Yiming Li (UCLA)Poster
Field electron emission, or electron tunneling through a potential barrier under a strong electrostatic field, is of broad interest to the accelerator physics community. For example, it is the source of undesirable dark currents in resonant cavities, providing a limit to high-field operation. The classical approach to field electron emission is the Fowler-Nordheim framework, which incorporates...
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Dr Sanae Samsam (INFN Milano)Poster
High order modes (HOM) in linear accelerators (Linacs) can negatively affect the quality and stability of the electron beam, which is essential for Free Electron Lasers (FELs). To address this issue, the Compact HOMEN (High Order Mode Evolution based on Energy budget) model has been developed to accurately predict and analyze HOM effects on beam dynamics in superconducting cavities. This model...
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Brendan O'Shea (SLAC National Accelerator Laboratory)Poster
Challenges for future accelerators include characterization of high current beams and the need for continual drift correction while delivering beams with non-trivial phase space correlations. Concomitantly, there is potential for Artificial Intelligence/Machine Learning to improve beam quality, increase delivery time to users and enable exotic beam configurations. Non-invasive diagnostics...
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Daniele Francescone (Sapienza)Poster
The relativistic interaction of short pulsed lasers or electrons with plasma has recently led to the birth of a new generation of femtosecond X-ray sources. Radiations with properties similar to those that can be observed from a wiggler or undulator, can be generated by the oscillations induced in the exited plasma by electrons (PWFA) or by lasers (LWFA), making plasma an interesting medium...
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Emily FramePoster
Bright electron beams have played a critical role in many recent advancements in accelerator technology, including free electron lasers and ultrafast electron diffraction/microscopy. Producing such beams via photoemission is ultimately limited by the maximum accelerating field that can be applied to a photocathode surface without degrading the beam brightness and the minimum achievable mean...
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Emily FramePoster
The Argonne Wakefield Accelerator's main beamline -- the drive-beam beamline -- utilizes a $1 +\frac{1}{2}$-cell radiofrequency photoinjector at 1.3 GHz to produce high-charge bunches. This contribution discusses an experiment to investigate photoemission from the RF gun over a wide range of operation parameters spanning different emission regimes. It especially demonstrates the generation of...
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Fabio Bosco (University of California, Los Angeles)Poster
Particle driven plasma wakefield acceleration (PWFA) exploits the intense wakefields excited in a plasma by a high brightness driver beam in order to accelerate a trailing, properly delayed witness beam. Moreover, multi-pulse driver beams with suitable spacing resonantly excite the plasma which enhances the amplitude of the accelerating field. However, before the injection into the plasma...
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Lily Berman (University of Strathclyde)Poster
Plasma photocathode injection in plasma wakefield acceleration (PWFA) has the potential to produce ultrahigh brightness beams with normalized emittance down to 10s of nm-rad and kA peak currents. Electron beams in PWFA may develop a large energy chirp due to the high accelerating gradient, which can be detrimental to beam quality preservation and prevent use in demanding applications such as...
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Dr Bruno Spataro (INFN - LNF)Poster
One of the most demanding development of the accelerating technologies is the manufacture of reliable RF devices suitable to withstand the highest accelerating gradients required by the design and the construction of the future accelerators [1]. Actually, RF cavities working at gradients of 100 MV/m or higher could be successfully used for the next generation of linear accelerators planned for...
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Thorsten Kamps (Helmholtz-Zentrum Berlin / Humboldt-Universität zu Berlin)Poster
The SEALab accelerator test facility is currently commissioning the superconducting radio-frequency photoelectron injector (SRF photoinjector), which has the potential to cover a wide range of beam parameters. With the ability to accelerate electron bunches from femtoseconds to picoseconds in length, with a charge range from femtocoulombs to nanocoulombs, the SRF photoinjector can produce beam...
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Dr Sven Reiche (Paul Scherrer Institut)Poster
We present simulation results of a scheme to generate high-power and short FEL pulses using an electron beam with irregularly spaced current peaks. Such an electron beam produces a train of short pulses with low power in the first undulator section. In the next sections, the electron beam is delayed in a way that only one of the short pulses is continuously amplified to a very high power. The...
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Gerard Andonian (UCLA/Radiabeam)Poster
The Trojan Horse experiment demonstrated the concept of a laser initiated plasma photocathode within a plasma wakefield bubble. In a similar concept, the plasma photocathode is located within a dielectric wakefield accelerator. Although the fields in the dielectric are not as high as that of a plasma, GV/m fields are still attainable, and due to operation at lower frequency, timing...
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Dr Bruno Spataro (INFN - LNF)Poster
New high-gradient accelerating RF cavities are nowadays developed in several national laboratories for high-energy physics applications. Ultra high gradients, up to the order of GV/m, can be achieved by using ultra compact accelerating structures up to the sub THz regime. Nevertheless, the experimental setup for measuring the main RF parameters for such compact structures is not trivial and...
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Dr Amir Weinberg (Ariel university )Poster
Following first light measurement at the Israeli THz Superradiant waveguide FEL we developed theoretical analysis corresponding to the concept scheme. We use analytical expressions to calculate the spectrum and energy emited into the rectangular waveguide LSM (Longitudinal Sector Magnetic) modes. The results compare well with numerical simulations using UCLA GPTFEL and are consisted with the...
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Maximilian Lenz (UCLA-PBPL)Poster
Longitudinal phase space measurements of high-brightness beams are limited by the streaking field strength and frequency of the RF source. Single cycle THz pulses generated through optical rectification have been proven to generate strong electric fields, offering significant improvement in field gradients while maintaining compactness for beam manipulation. We present experimental designs to...
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