Author: Wu, X.W.
Paper Title Page
MOPGW047 Analysis and Simulation of the "After-Pulse" RF Breakdown 196
 
  • X. Lin, H.B. Chen, Z.N. Liu, J. Shi, H. Zha
    TUB, Beijing, People’s Republic of China
  • X.W. Wu
    CERN, Meyrin, Switzerland
  
  During the high power experiment of a single-cell standing-wave accelerating structure, it was observed that many RF breakdowns happen when the field inside cavity is decaying after the input rf pulse is off. The distribution of breakdown timing shows a peak at the moment of RF power switches off. A series of simulation was performed to study the after-pulse breakdown effect in such a standing-wave structure. A method of calculating poynting vector over time is proposed in this article to study the modified poynting vector at critical points in the cavity. Field simulation and thermal simulation were also carried out to analyse possible reasons for the after-pulse breakdown effect.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW047  
About • paper received ※ 14 May 2019       paper accepted ※ 17 May 2019       issue date ※ 21 June 2019  
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TUPRB032 The CompactLight Design Study Project 1756
 
  • G. D’Auria, S. Di Mitri, R.A. Rochow
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • M. Aicheler
    HIP, University of Helsinki, Finland
  • A.A. Aksoy
    Ankara University, Accelerator Technologies Institute, Golbasi, Turkey
  • D. Alesini, M. Bellaveglia, B. Buonomo, F. Cardelli, M. Croia, M. Diomede, M. Ferrario, A. Gallo, A. Giribono, L. Piersanti, B. Spataro, C. Vaccarezza
    INFN/LNF, Frascati, Italy
  • R. Apsimon, A. Castilla
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • J.M. Arnesano, F. Bosco, L. Ficcadenti, A. Mostacci, L. Palumbo
    Sapienza University of Rome, Rome, Italy
  • A. Bernhard, J. Gethmann
    KIT, Karlsruhe, Germany
  • G. Burt
    Lancaster University, Lancaster, United Kingdom
  • M. Calvi, T. Schmidt, K. Zhang
    PSI, Villigen PSI, Switzerland
  • H.M. Castaneda Cortes, J.A. Clarke, D.J. Dunning, N. Thompson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A.W. Cross, L. Zhang
    USTRAT/SUPA, Glasgow, United Kingdom
  • G. Dattoli, F. Nguyen, A. Petralia
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • R.T. Dowd, D. Zhu
    AS - ANSTO, Clayton, Australia
  • W.D. Fang
    SINAP, Shanghai, People’s Republic of China
  • A. Faus-Golfe, Y. Han
    LAL, Orsay, France
  • E.N. Gazis, N. Gazis
    National Technical University of Athens, Zografou, Greece
  • R. Geometrante, M. Kokole
    KYMA, Trieste, Italy
  • V.A. Goryashko, M. Jacewicz, R.J.M.Y. Ruber
    Uppsala University, Uppsala, Sweden
  • X.J.A. Janssen, J.M.A. Priem
    VDL ETG, Eindhoven, The Netherlands
  • A. Latina, X. Liu, C. Rossi, D. Schulte, S. Stapnes, X.W. Wu, W. Wuensch
    CERN, Geneva, Switzerland
  • O.J. Luiten, P.H.A. Mutsaers, X.F.D. Stragier
    TUE, Eindhoven, The Netherlands
  • J. Marcos, E. Marín, R. Muñoz Horta, F. Pérez
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  • G. Taylor
    The University of Melbourne, Melbourne, Victoria, Australia
  
  Funding: This project has received funding from the European Union’s Horizon2020 research and innovation programme under grant agreement No 777431
The H2020 CompactLight Project (www. CompactLight.eu) aims at designing the next generation of compact X-rays Free-Electron Lasers, relying on very high gradient accelerating structures (X-band, 12 GHz), the most advanced concepts for bright electron photo injectors, and innovative compact short-period undulators. Compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, and will be significantly more compact, with a smaller footprint,  as a consequence of the lower energy and the high-gradient X-band structures. In addition, the whole infrastructure will also have a lower electrical power demand as well as lower construction and running costs. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPRB032  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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WEPRB068 Ka-Band Linearizer Studies for a Compact Light Source 2976
 
  • A. Castilla, G. Burt, W.L. Millar
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • A. Latina, X. Liu, W.L. Millar, X.W. Wu, W. Wuensch
    CERN, Meyrin, Switzerland
  
  Funding: This project has received funding from the European Union’s Horizon2020 research and innovation programme under grant agreement No 777431.
The CompactLight project is currently developing the design of a next generation hard X-ray FEL facility, based on high-gradient X-band (12 GHz) structures, bright electron photo-injectors, and compact short period undulators. However, to improve the brightness limitations due to the non-linear energy spread of the electron bunches, a K-band (36 GHz) linearizer is being considered to provide a harmonic compensation during the bunch compression. In this paper, we analyze the feasibility of such linearizer. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB068  
About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)