Keyword: electron
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MOVIR01 The Future Circular Collider Study collider, MMI, detector, luminosity 6
 
  • F. Zimmermann, M. Benedikt
    CERN, Meyrin, Switzerland
  • A.-S. Müller
    KIT, Eggenstein-Leopoldshafen, Germany
 
  Funding: This work was supported, in part, by the European Commission under the HORIZON2020 Research and Innovation Programme, grant agreement 951754 (FCCIS).
At the end of 2018, a large worldwide collaboration, with contributors from more than 350 institutes completed the conceptual design of the Future Circular Collider (FCC), a ~100 km accelerator infrastructure linked to the existing CERN complex, that would open up the way to the post-LHC era in particle physics. We present an overview of the two main accelerator options considered in the design study, namely the lepton collider (FCC-ee), serving as highest-luminosity Higgs and electroweak factory, and the 100-TeV energy-frontier hadron collider (FCC-hh), along with the ongoing technological R&D efforts and the planned next steps. A recently approved EU co-funded project, the FCC Innovation Study (FCCIS), will refine the design of the lepton collider and prepare the actual implementation of the FCC, in collaboration with European and global partners, and with the local authorities.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-MOVIR01  
About • paper received ※ 09 June 2020       paper accepted ※ 04 September 2020       issue date ※ 12 October 2020  
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WEVIR03 Microbunch Rotation as an Outcoupling Mechanism for Cavity-based X-Ray Free Electron Lasers FEL, quadrupole, cavity, undulator 35
 
  • R.A. Margraf, Z. Huang
    Stanford University, Stanford, California, USA
  • Z. Huang, J.P. MacArthur, G. Marcus
    SLAC, Menlo Park, California, USA
 
  Funding: This work was supported by the Department of Energy, Laboratory Directed Research and Development program at SLAC National Accelerator Laboratory, under contract DE-AC02-76SF00515.
Electron bunches in an undulator develop periodic density fluctuations, or microbunches, which enable the exponential gain of power in an X-ray free-electron laser (XFEL). For certain applications, one would like to preserve this microbunching structure of the electron bunch as it experiences a dipole kick which bends its trajectory. This process, called microbunch rotation, rotates the microbunches and aligns them perpendicular to the new direction of electron travel. Microbunch rotation was demonstrated experimentally by MacArthur et al. with soft x-rays* and additional unpublished data demonstrated microbunch rotation with hard x-rays. Further investigations into the magnetic lattice used to rotate these microbunches showed that microbunches can be rotated using an achromatic lattice with a small R56, connecting this technique to earlier studies of achromatic bends. Here, we propose and study a practical way to rotate Angstrom-level microbunching as an out-coupling mechanism for the Optical Cavity-Based X-ray FEL (CBXFEL) project at SLAC.
*J. P. MacArthur, A. A. Lutman, J. Krzywinski, and Z. Huang, "Microbunch Rotation and Coherent Undulator Radiation from a Kicked Electron Beam", Physical Review X, vol. 8, no. 4, Nov. 2018.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-WEVIR03  
About • paper received ※ 01 June 2020       paper accepted ※ 12 June 2020       issue date ※ 11 August 2020  
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WEVIR06 Hollow Electron Beams in a Photoinjector linac, simulation, cathode, laser 49
 
  • A. Halavanau, Y. Ding, C.E. Mayes
    SLAC, Menlo Park, California, USA
  • S. Baturin, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • P. Piot
    ANL, Lemont, Illinois, USA
 
  Photoinjectors have demonstrated the capability of electron beam transverse tailoring, enabled by the microlens array (MLA) setup. For instance, electron beams, transversely segmented into periodic beamlet formations, were successfully produced in several experiments at Argonne Wakefield Accelerator (AWA). In this proceeding, we discuss necessary steps to demonstrate the hollow electron beam generation, with an arbitrary diameter and width with the MLA. We also present beam dynamics simulations and highlight key features of the hollow beam transport in LCLS copper linac.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-WEVIR06  
About • paper received ※ 01 June 2020       paper accepted ※ 12 June 2020       issue date ※ 27 October 2020  
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WEVIR10 Adaptive Feedback Control and Machine Learning for Particle Accelerators FEL, controls, diagnostics, feedback 53
 
  • A. Scheinker
    LANL, Los Alamos, New Mexico, USA
 
  The precise control of charged particle beams, such as an electron beam’s longitudinal phase space as well as the maximization of the output power of a free electron laser (FEL), or the minimization of beam loss in accelerators, are challenging tasks. For example, even when all FEL parameter set points are held constant both the beam phase space and the output power have high variance because of the uncertainty and time-variation of thousands of coupled parameters and of the electron distribution coming off of the photo cathode. Similarly, all large accelerators face challenges due to time variation, leading to beam losses and changing behavior even when all accelerator parameters are held fixed. We present recent efforts towards developing machine learning methods along with automatic, model-independent feedback for automatic tuning of charge particle beams in particle accelerators. We present experimental results from the LANSCE linear accelerator at LANL, the EuXFEL, AWAKE at CERN, FACET-II and the LCLS.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-WEVIR10  
About • paper received ※ 27 May 2020       paper accepted ※ 12 June 2020       issue date ※ 14 June 2020  
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WEVIR16 A Novel Nondestructive Diagnostic Method for MeV Ultrafast Electron Diffraction experiment, detector, diagnostics, real-time 67
 
  • X. Yang, M.G. Fedurin, J.J. Li, T.V. Shaftan, V.V. Smaluk, L. Wu, L. Yu, Y. Zhu
    BNL, Upton, New York, USA
  • W. Wan
    ShanghaiTech University, Shanghai, People’s Republic of China
 
  Funding: BNL LDRD
A real-time, nondestructive, Bragg-diffracted electron beam energy, energy-spread and spatial-pointing jitter monitor is experimentally verified by encoding the electron beam energy and spatial-pointing jitter information into the mega-electron-volt ultrafast electron diffraction pattern. The shot-to-shot fluctuation of the diffraction pattern is then decomposed to two basic modes, i.e., the distance between the Bragg peaks as well as its variation (radial mode) and the overall lateral shift of the whole pattern (drift mode). Since these two modes are completely decoupled, the Bragg-diffraction method can simultaneously measure the shot-to-shot energy fluctuation from the radial mode with 2,10-4 precision and spatial-pointing jitter from the drift mode having wide measurement span covering energy jitter range from 10-4 to 10-1. The key advantage of this method is that it allows us to extract the electron beam energy spread concurrently with the ongoing experiment and enables online optimization of the electron beam especially for future high charge single-shot ultrafast electron diffraction (UED) and ultrafast electron microscopy (UEM) experiments.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-WEVIR16  
About • paper received ※ 08 June 2020       paper accepted ※ 14 June 2020       issue date ※ 07 September 2020  
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THVIR12 FLASH Radiation Therapy: Accelerator Aspects radiation, proton, linac, photon 71
 
  • A. Patriarca, L. De Marzi, V. Favaudon, S.J. Meyroneinc
    Institut Curie - Centre de Protonthérapie d’Orsay, Orsay, France
 
  One of the new paradigms in radiation therapy (RT) is the FLASH dose delivery irradiation technique. The FLASH methodology consists in delivering millisecond pulses of radiation (total beam-on time < 100-500 ms) delivered at a high mean dose-rate (> 40-100 Gy/s) and pulse amplitude (> 1E6 Gy/s), over 2000 times faster than in conventional RT. New accelerator ideas are under development or are being tested to deliver this type of beam. In this paper we will report the accelerator technology used for the pre-clinical studies and the necessary developments to deliver this novel dose RT technique.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-THVIR12  
About • paper received ※ 01 June 2020       paper accepted ※ 12 June 2020       issue date ※ 28 September 2020  
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THVIR14 Development of a Hybrid Electron Accelerator System for the Treatment of Marine Diesel Exhaust Gases radiation, MMI, operation, plasma 80
 
  • T. Torims, K. Kravalis, G. Pikurs, A. Ruse
    Riga Technical University, Riga, Latvia
  • A.G. Chmielewski, A. Pawelec, Z. Zimek
    Institute of Nuclear Chemistry and Technology, Warsaw, Poland
  • G. Mattausch
    Fraunhofer FEP, Dresden, Germany
  • M. Vretenar
    CERN, Meyrin, Switzerland
 
  Funding: This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 730871
Project seeks to tackle the shipping industry’s most pressing problem, its large-scale emissions of SOx, NO and PM, by developing a hybrid exhaust gas-cleaning technology that combines an EB accelerator with improved wet-scrubbing technology. It is unique - in a single technological system - addresses all three types of emissions simultaneously. It promises to be cheaper and more efficient than existing solutions. There are two main stages involved: 1) SO2 and NOx oxidation during irradiation of wet gases by the EB from the accelerator and 2) the pollution products absorption into aqueous solution. For the very first time, test trials in the real maritime environment where conducted and attracted interest of maritime industry, policy makers and accelerator community. Proof-of-Concept clearly confirmed potential of this accelerator technology and formed basis for the full-scale project where this hybrid system will be applied to the sea-going ferry on the regular traffic. Considering that this project is of highest relevance to the accelerator community at large, we will be happy to present it and disseminate its promising results along with the related unfolding activities.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-THVIR14  
About • paper received ※ 01 June 2020       paper accepted ※ 11 June 2020       issue date ※ 25 June 2020  
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