Author: Gu, Q.
Paper Title Page
TUPAB119 Beam Loss Study for the Implementation of Dechirper at the European XFEL 1670
 
  • J.J. Guo
    University of Chinese Academy of Sciences, Beijing, People’s Republic of China
  • W. Decking, M.W. Guetg, J.J. Guo, S. Liu, W. Qin, I. Zagorodnov
    DESY, Hamburg, Germany
  • Q. Gu, J.J. Guo
    SINAP, Shanghai, People’s Republic of China
  • Q. Gu
    Shanghai Advanced Research Institute, Pudong, Shanghai, People’s Republic of China
 
  The European XFEL is a free-electron laser facility based on superconducting linac with high repetition rate up to 4.5 MHz. Wakefield structure (also called dechirper module) is planned to be installed in front of the SASE beam line at the European FEL, which can be used as a kicker for two-color scheme or a dechirper to control the bandwidth of SASE radiation. When the beam pass through the dechirper module, strong longitudinal and transverse wakefields can be excited to introduce a correlated energy chirp and a kick along the bunch. However, due to the relatively small gap of dechirper, beam halo particles hitting the dechirper module can lead to energy deposition and generate additional radiation, which can cause serious damage to the downstream undulators. For this reason, simulations have been performed using BDSIM to define the maximum acceptable beam halo, and the results are presented in this paper.  
poster icon Poster TUPAB119 [1.489 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB119  
About • paper received ※ 16 May 2021       paper accepted ※ 15 June 2021       issue date ※ 12 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPAB119 Many-Objective Beam Dynamics Optimization for High-Repetition-Rate XFEL Photoinjector 3991
 
  • Z.H. Zhu, J.W. Yan
    SINAP, Shanghai, People’s Republic of China
  • D. Gu
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • Q. Gu
    Shanghai Advanced Research Institute, Pudong, Shanghai, People’s Republic of China
 
  SHINE, as the first hard x-ray free-electron-laser (FEL) facility in China, is design to provide high-brightness FEL lasing under high-repetition-rate operation. In order to drive x-ray FEL pulses with high qualities, the photoinjector section is deployed to provide the specified electron beam with low transverse emittance and high brightness. Normally the multi-objective optimization algorithm is employed in the injector beam dynamics design. In this paper, the many-objective optimization algorithm NSGA-III is introduced to the injector physical design for optimizing the 4 detailed beam quality properties using 17 variables for the first time. The results of the optimization are presented and the correlations are analyzed. This approach can provide guidance for further physical research as well as improve the beam dynamics optimization efficiency.  
poster icon Poster THPAB119 [0.936 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB119  
About • paper received ※ 17 May 2021       paper accepted ※ 07 July 2021       issue date ※ 22 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)