Author: Li, X.P.
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MOPH26 CEPC Linac Design and Error Study 89
 
  • C. Meng, Y.L. Chi, X.P. Li, G. Pei, S. Pei, D. Wang, J.R. Zhang
    IHEP, Beijing, People's Republic of China
  
  Circular Electron-Positron Collider (CEPC) is a 100 km ring e+ e− collider for a Higgs factory, including the double ring for collider and the injector. The injector is composed of the linac and booster. The linac of CEPC is a normal conducting S-band linac with frequency in 2856.75 MHz and provide electron and positron beam at an energy up to 10 GeV with bunch charge in 1.0 nC and repetition frequency in 100 Hz. The linac scheme will be detailed discussed. The beam dynamic results with short-range Wakefields and detailed error study including misalignment errors and field errors also be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH26  
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MOPH28
 Design of a 1.3 GHz CW Room Temperature Buncher for the PAPS Project  
 
  • S. Shu
    Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
  • X.P. Li, S. Pei
    IHEP, Beijing, People's Republic of China
  
  A 1.3 GHz CW room temperature buncher is located between the DC gun and the superconducting accelerator modules in the PAPS project. A brief beam dynamic study of the buncher system will be presented in this paper. According to the beam dynamic study, the effective cavity voltage should be more than 120 kV. The designed cavity has a unload Q of 23000 and a shunt impedance of 5.3 MΩ. 3-D electromagnetic simulation codes CST MWS and HFSS are used to optimize the inner dimensions of the buncher cavity. The multi-physics analysis is carried out to determine the cooling scheme and the mechanical sizes of the metal body. The RF coupler design and HOM analysis will also be presented in this paper.  
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WEAH4 Bunch Length Measurement System for 500 kV Photocathode DC Gun at IHEP 172
 
  • O. Xiao
    Institute of High Energy Physics (IHEP), People's Republic of China
  • X.P. Li, D.R. Sun, X. Wang, J.R. Zhang
    IHEP, Beijing, People's Republic of China
  
  In September of 2011, a 500 kV photocathode DC gun was proposed for FEL-ERL two purpose facility at Insti-tute of High Energy Physics(IHEP). So far, the whole system has been installed and the preliminary high voltage conditioning has been carried out. Since the photocathode response time influence the beam quality, the bunch length measurement system is required, which consist of a solenoid, a 1.3 GHz standing wave deflecting cavity, a slit and a YAG screen. In this paper, the design of a deflecting cavity with TM210 mode is presented. In addition, the beam dynamics study of the bunch measurement system is performed using ASTRA and the layout of the bunch measurement system is determined. The bunch length in simulation is in good agreement with theoretical calculation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-WEAH4  
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