Author: Fang, W.
Paper Title Page
MOPFI044 VHF Gun Research at SINAP 380
  • Q. Gu, L. Chen, W. Fang, G.Q. Lin
    SINAP, Shanghai, People's Republic of China
  The R&D work on the high power THz based on energy recovery linac (ERL) has been carried out in Shanghai Institute of Applied Physics (SINAP). One of the key components for the ERL is the high brightness electron source. The low frequency gun technology has been adopted, by comparing with the SRF gun and DC gun. In this paper, the design and cold test of a 250MHz gun will be presented.  
MOPFI045 Studying of Multipacting in Micro-pulse Electron Gun 383
  • L. Liao, W. Fang, Q. Gu, M. Zhang, M.H. Zhao
    SINAP, Shanghai, People's Republic of China
  Depending on the complexity of multipacting phenomenon, more works are focused on the occurrence of multipacting in the micro-pulse electron gun. In this paper, the multipacting resonance condition is determined in a reentrant cavity model of the gun. The resonance parameters work as the input for VORPAL simulations in order to achieve a steady state saturation in the cavity. The simulation results showed that the gun can give rise to electrons beam with high currents and short pulses.  
TUPEA043 Linac Design for Nuclear Data Measurement Facility 1229
  • M. Zhang, W. Fang, Q. Gu, X. Li
    SINAP, Shanghai, People's Republic of China
  Pulsed neutrons based on an electron linear accelerator (linac) are effective for measuring energy dependent cross-sections with high resolution by using the time-of-flight (TOF) technique. In this paper, we describe the 15-MeV linac design for the Nuclear Data project in Shanghai Institute of Applied Physics (SINAP). The linac has three operating modes and the maximum average power is 7.5kW. We describe the characteristics of the linac and the study of the beam dynamics is also presented.  
WEPFI038 R&D of New C-band Accelerating Structure for SXFEL Facility 2785
  • W. Fang, Q. Gu, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  • L. Chen, X. Sheng
    BVERI, Beijing, People's Republic of China
  • D.C. Tong
    TUB, Beijing, People's Republic of China
  C-band high gradient accelerating structure is crucial technology for Shanghai Soft X-ray FEL facility. Based on the prototype, the optimized C-band accelerating structure is proposed, and the experimental model is ready for high power test. In this paper, optimization design and some experiment results are presented, also design, fabrication and cold test of experimental model are introduced.  
WEPFI039 New X-band Deflecting Cavity Design for Ultra-short Bunch Length Measure of FEL at SINAP 2788
  • J.H. Tan, W. Fang, Q. Gu, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  For the development of Free Electron Lasers (FEL) at SINAP, ultra-short bunch is the crucial requirement for excellent lasing performance. It’s big challenge for deflecting cavity to measure the length of ultra-short bunch, and higher deflecting gradient is required for higher measurement resolution. X-band travelling wave deflecting structure has features of higher deflecting voltage and compact structure, which is good performance at ultra-short bunch length measuring. In this paper, a new X-band deflecting structure was designed, operated at HEM11- 2π/3 mode. For suppressing the polarization of deflection plane of the HEM11 mode, two symmetrical caves are added on the cavity wall to separate two polarized modes. More details of design and simulation results are presented in this paper.  
WEPFI040 R&D of C-band Pulse Compression for Soft X-ray FEL at SINAP 2791
  • C.P. Wang, W. Fang, Q. Gu, W.C. Wang, Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  A compact Soft X-ray Free Electron Lasers facility is presently being constructed at SINAP, and 8 C-band accelerating structure unit are required for third-stage including 4 pulse compressors. The field mode of C-band SLED is TE0.1.15 with high quality factor Q, and the coupling coefficient is 8.5. Based on the design, the power pulse of klystron is compressed from 2.5μs to 0.5μs, and finally the power gain is about 3.1. In this paper, the details and simulation of 3-dB coupler, mode convertors and the resonant cavities are presented, meanwhile some cold test results of cavity are also analyzed at the end of this paper.