Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (3): 30103-030103.doi: 10.11889/j.0253-3219.2018.hjs.41.030103


Experimental study on phase space reconstruction of high-brightness electron beam

YU Qinglin1,2, ZHANG Meng1, GU Duan1, ZHAO Minghua1   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-09-27 Revised:2017-10-12 Online:2018-03-10 Published:2018-03-14

Abstract: [Background] Phase space is an important parameter to describe the beam transmission, and it is of great importance to measure the phase space distribution experimentally in linear accelerator (LINAC) commissioning. Computer tomography technology has been used in many accelerators to characterize the phase space of an electron beam in recent years. [Purpose] This study aims to measure two-dimensional distribution of phase space by reconstruction technology for high-brightness electron beam. [Methods] Maximum entropy (MENT) algorithm and filtered back projection (FBP) algorithm were combined with computer tomography technology and normalized phase space theory to reconstruct the normalized phase space of the beam. Then transformed the normalized phase space to real phase space with experimental verification at special beam insertion (BI1) of Shanghai Soft X-ray Free Electron Laser facility (SXFEL). [Results] The results from FBP algorithm and MENT algorithm were compared, and the latter showed better performance than the former. The emittance and Twiss parameters calculated by reconstructed phase space were very close to the values obtained by quadrupole scan method. [Conclusion] The experimental results show that computer tomography technology with MENT algorithm can reconstruct the beam phase space exactly.

Key words: Normalized phase space, Phase space reconstruction, MENT algorithm, SXFEL

CLC Number: 

  • TL271