A welcome to Cornell and the ERL 22 workshop by the laboratory director
https://cornell.zoom.us/j/93456110989?pwd=WXVwYU1xaW51cHcrWFROSFdOcEpnQT09
Following the European Strategy process in 2019, five Roadmap Panels were set up to prepare the technologies needed for future accelerators and colliders: high-field magnets, SRF, muon colliders, plasma wakefield accelerators and Energy Recovery Linacs (ERLs). The ERL Roadmap Panel, consisting of ERL experts from around the world, first developed a comprehensive overview of current and future...
Since end of the year 2020 the energy recovery linac (ERL) project bERLinPro of Helmholtz-Zentrum Berlin (HZB) has been officially completed. But what is the status of this facility, the next scientific goals in the framework of accelerator physics at HZB, what are the perspectives? To reflect the continuation of this endeavor and the broadening of applications of this machine from high...
Institut für Kernphysik, Fachbereich Physik, Technische Universität Darmstadt
The superconducting Darmstadt linear accelerator S-DALINAC [1] is a thrice-recirculating accelerator for electrons at TU Darmstadt. Since its establishment in 1991, the S-DALINAC was mainly developed and operated by students. Besides the conventional acceleration scheme serving various nuclear-physics experiments,...
The 5-pass energy recovery project at CEBAF (ER@CEBAF) would become the first facility to have the energy reach to demonstrate ERL performance in the multi-GeV range. This increment in peak energy from the $1\,\textrm{GeV}$ CEBAF-ER demonstration to the target $\sim7\,\textrm{GeV}$ brings incoherent synchrotron radiation-induced energy loss, presents an invaluable opportunity for multi-pass...
The TRIUMF electron linear accelerator (e-Linac) was conceived to be one of the two main drivers for the upcoming Advanced Rare Isotope Facility (ARIEL). The e-Linac has been commissioned up to 10 kW of average beam power at 30 MeV, for both CW and pulsed beam. It is envisioned for this facility to eventually be upgraded to an Energy Recovery Linac (ERL), with a preliminary design having...
We present the detailed design of a compact light source named BriXSinO. BriXsinO is a dual high flux radiation source Inverse Compton Source (ICS) of X-ray and Free-Electron Laser of THz spectral range radiation conceived for medical applications and general applied research. The accelerator is a push-pull CW-SC Energy Recovery Linac (ERL) based on superconducting cavities technology and...
Any proposal for an accelerator facility based upon a multipass energy recovery linac (ERL) must possess a self-consistent match in longitudinal phase space, not just transverse phase space. We therefore present a semianalytic method to determine self-consistent longitudinal matches in any multipass ERL. We apply this method in collider scenarios (embodying an energy spread minimizing match)...
In a multi-recirculating energy-recovery LINAC (ERL), electrons are accelerated several times in the same LINAC and are decelerated afterwards in the very same LINAC just as often. Even in the case of a twice-recirculating ERL, there are challenges compared to a single-recirculating ERL: When low injector energies are used, phase slippage leads to significantly different energy gains per LINAC...
The baseline scheme for hadron beam cooling in the Electron Ion Collider (EIC) calls for Coherent electron Cooling (CeC) of the hadrons with non-magnetized electrons at high energy (150 MeV electrons), and additional cooling via conventional bunched beam cooling using a precooler system. The electron beam parameters for these concepts are at or beyond the current state of the art, with...
In a recent paper, Valery Telnov proposed a linear collider based on twin axis cavities [1]. In a subsequent presentation, Erk Jensen proposed a modification with intra-bucket energy recovery [2], which eliminates higher order mode excitation. Interestingly, this means that there is no need for large aperture SRF cavities and high-power HOM couplers. The Ghost Collider adopts these ideas, and...
https://cornell.zoom.us/j/93456110989?pwd=WXVwYU1xaW51cHcrWFROSFdOcEpnQT09
https://cornell.zoom.us/j/93456110989?pwd=WXVwYU1xaW51cHcrWFROSFdOcEpnQT09
The energy recovery linac (ERL) at Helmholtz-Zentrum Berlin (HZB) is in the final stage of assembly and follow-up commissioning of the injector beam line. This injector consists of a 1.4\lamba/2 cell SRF photo-injector and a three two cell Booster cryomodule, the latter based on a modified design of the Cornell injector cavity shape. The injector was designed for a final beam current of 100...
Extending the charge lifetime of today’s spin polarized GaAs photoelectron guns from hundreds to thousands of Coulombs is a reasonable expectation for long-duration operation at milliampere beam current. In this presentation I will describe some of the topics frequently considered to achieve this goal, and will make quantitative comments about their proven or proposed likelihood for...
Cs3Sb and related alkali antimonide compounds are high efficiency semiconductor photocathodes that can be operated with visible light and possess quantum efficiency of the order of 1-10% at green light wavelengths. Use of these photocathodes in modern linear accelerators is desirable thanks to their potential to generate high brightness electron beams. However, the ultimate brightness of a...
https://cornell.zoom.us/j/93456110989?pwd=WXVwYU1xaW51cHcrWFROSFdOcEpnQT09
In extreme ultraviolet (EUV) lithography, high volume manufacturing recently started using a laser-produced plasma (LPP) source of 250-W power at 13.5 nm. However, development of a high-power EUV light source is still very important to overcome stochastic effects with a high throughput. The required EUV power to realize the 3-nm node and beyond with a high speed of future scanners is estimated...
https://cornell.zoom.us/j/93456110989?pwd=WXVwYU1xaW51cHcrWFROSFdOcEpnQT09
Energy-frontier particle accelerators are among the most exciting, complex, challenging, and expensive research instruments performing high precision measurements confirming the fundamentals of the physics and broadening new research horizons. Currently the highest energy machines, from multi-GeV to several TeV, (ILC, FCC, CLIC) capable of searching for the most basic building blocks of matter...
At Eindhoven university a high repetition rate thermionic injector is being built. The injector is capable of supplying electron bunches at a repetition rate of 1.5 GHz, which can be used for x-ray generation.
The electron source generates a continuous beam with a high current and low emittance through thermionic emission. The continuous electron beam is then chopped into a pulsed beam by a...
The Cornell BNL ERL Test Accelerator (CBETA) is the first machine which achieved multi-pass energy recovery employing superconducting cavities. While SRF cavities operated with a narrow bandwidth reduce the overall power consumption of the main linac, maintaining stable field required for energy-recovery in the presence of microphonics detuning becomes a challenging task. We discuss the...
Higher order modes (HOMs) damping is a crucial issue for the next generation of high-current accelerators. Beam-induced HOMs can store sufficient energy in the superconducting RF (SRF) cavities giving rise to beam instabilities and increasing the heat load at cryogenic temperature. To limit these effects, the use of HOM couplers on the cutoff tubes of SRF cavities becomes crucial to absorb...
https://cornell.zoom.us/j/93456110989?pwd=WXVwYU1xaW51cHcrWFROSFdOcEpnQT09
We present a proposal related to the development of a High Brightness Beams Test Facility (HB2TF) at the INFN-LASA laboratory close to Milan (Italy).
The Test Facility will allow to carry out experiments with the high current high brightness CW electron beam in frontier areas of accelerator physics.
The Test Facility setup will comprise a high-performance laser driven DC Gun (using...
A γ-γ collider has long been considered an option for a Higgs Factory. Such colliders rely on Compton back-scattering for generating γ photons. The present proposals all choose a thick laser target for scattering. In this paper, we present a new approach for a γ-γ collider utilizing a thin laser target and energy recovery linac for driving the electron beam. This new concept eliminates useless...
We present a new concept of a compact high-power linear proton accelerator with an average power of 10 MW at a kinetic beam energy of 1 GeV. Acceleration is accomplished in several stages. In each stage, the beam is recirculated a few times through the same set of SRF cavities. The energy range, cavity type, number of cavities and number of beam recirculations of each stage are optimized to...
So far, IBS has not been observed in single pass electron accelerators because charge density orders of magnitude higher than in storage rings would be needed. We show that such density is now available at high brightness electron linacs for free-electron lasers (FELs).We report measurements of the beam energy spread in the FERMI linac in the presence of the microbunching instability, which...
The Mainz Energy-recovery Superconducting Accelerator (MESA) at the Institut für Kernphysik der Johannes Gutenberg-Universität Mainz will be commissioned in 2023. Detailed simulations of possible beam optics can be helpful to prepare for this process in order to speed up actual commissioning. The particle tracking code OPAL was chosen as a toolbox to perform these simulations as it handles...
The PAL-XFEL based on S-band normal conducting linac has demonstrated excellent timing stability and unprecedented peak brightness, outperforming other XFEL facilities since its start of user service operation in June 2017. Based on superconducting RF technology, CW XFEL will be on the horizon, increasing the average brightness by four orders of magnitude from pulsed XFEL; LCLS-II in the USA...
The PERLE collaboration is developing a high power (with a current of up to 20 mA of 500 MeV electrons) ERL machine with three acceleration and three deceleration passes through two cryo-modules. Here we present the design of the first stage of the this machine with one cryo-module that would demonstrate the six-passes operation at a high current with a maximal energy of 250 MeV. All the...
A project for a polarized electron-ion collider in China (EicC) is planned based on the high intensity heavy ion accelerator facility (HIAF), which is currently under con-struction. According to the electron beam parameters from the white-paper of EicC, two electron injectors are required, one is polarized electron beam for the collider and another one is for the energy recovery linac (ERL)...
The essence of the ERL operation implies that at least two beams (accelerated and decelerated) are co-propagating in the same vacuum vessel and each beam has its own trajectory. The existing beam position monitors measure only “average” trajectory but not that of an individual beam, unless the time separation between bunches is so large that one can resolve individual bunches.
It was...
We propose to develop an energy-recovery-linac (ERL)-based X-ray free-electron laser (FEL). Taking advantage of the demonstrated high-efficiency energy recovery of the beam power in the ERL, the proposed concept offers the following benefits: i) recirculating the electron beam through high-gradient SRF cavities shortens the linac, ii) energy recovery in the SRF linac saves the klystron power...
The VSR (Variable pulse length Storage Ring) demo module is a prototype for the superconducting upgrade of HZB’s BESSY II. The module houses two 1.5 GHz superconducting cavities operated at 1.8K in continuous wave (CW) mode. Each cavity has five water cooled Waveguide HOM Absorbers with high thermal load (450 W), which requires them to be water cooled. This setup introduces several design...
