Design of BEPCⅡ Positron Source

  • The positron yield is a very important parameter for positron source,and directly symbolizes the quality of an e+ accelerator. Now BEPC is planned to be upgraded into BEPCⅡ,many parameters of positron source should be greatly improved to meet the requirements of intense e+ beam injection. We will optimize each section of the positron source to get the highest yield. EGS4 and PARMELA codes are used for positron source design. We use EGS4 code to simulate the electron-gamma shower of high-energy electrons in a medium,optimize target thickness,and analyze positron distributions in phase space. We discuss the positron yield's dependence on some system parameters. Then we use PARMELA code to track and simulate particle motion in the matching,focusing and accelerating systems,discuss how to choose capture section RF phase. Finally we get a reasonable positron yield at the end of positron source.
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  • [1] YAO Chung-Guo. Electron Linear Accelerator. Beijing: Science Publisher, 1996. 491-497(in Chinese)(姚充国. 电子直线加速器北京: 科学出版社, 1986. 491-497)2 Chehab R. Positron Sources. CERN Accelerator School, Fifth General Accelerator Physics Course, 1994, 23 Nelson W R. The EGS4 Code System. SLAC-265, UC-32, 19854 XU Shu-Yan. User Manual of EGS4 Softerware Package. Beijing, China Institute of Atomic Energy, 1994 (in Chinese)(许淑艳. EGS4通用软件包用户使用指南. 北京, 中国原子能研究院, 1994)5 Neal R B et al. The Stanford Two-Mile Accelerator. New York, 1968. 556-5596 Young L M. PARMELA. Los Alamos National Laboratory Electron linac Design Codes, PC Version. 1998
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GOU Wei-Ping and PEI Guo-Xi. Design of BEPCⅡ Positron Source[J]. Chinese Physics C, 2002, 26(3): 279-285.
GOU Wei-Ping and PEI Guo-Xi. Design of BEPCⅡ Positron Source[J]. Chinese Physics C, 2002, 26(3): 279-285. shu
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Received: 2001-04-10
Revised: 1900-01-01
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Design of BEPCⅡ Positron Source

    Corresponding author: GOU Wei-Ping,
  • Institute of High Energy Physics,CAS,Beijing 100039,China

Abstract: The positron yield is a very important parameter for positron source,and directly symbolizes the quality of an e+ accelerator. Now BEPC is planned to be upgraded into BEPCⅡ,many parameters of positron source should be greatly improved to meet the requirements of intense e+ beam injection. We will optimize each section of the positron source to get the highest yield. EGS4 and PARMELA codes are used for positron source design. We use EGS4 code to simulate the electron-gamma shower of high-energy electrons in a medium,optimize target thickness,and analyze positron distributions in phase space. We discuss the positron yield's dependence on some system parameters. Then we use PARMELA code to track and simulate particle motion in the matching,focusing and accelerating systems,discuss how to choose capture section RF phase. Finally we get a reasonable positron yield at the end of positron source.

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