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Chinese Physics C> 2006, Vol. 30> Issue(2) : 166-170 

Design of a Pulsed Low Energy Positron System Based on Beijing Intense Slow Positron Beam

  •  Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, CAS, Beijing 100049, China2 Accelerator Center, Institute of High Energy Physics, CAS, Beijing 100049, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

  • The design of a pulsing system for an intense slow positron beam is described in this paper. Slow positron annihilation lifetime measurement is an important method to study the depth-dependent characteristics of the surface and near surface. The start signal for slow positron lifetime measurement can be obtained from the pulsing system, which consists of a reflection type chopper, a prebuncher and a buncher. On the basis of the simulation of dynamics process by Parmela, the frequency of the buncher and the positron energy have been chosen to be 150MHz and 330eV respectively. The designed time resolution of this system is about 150ps (FWHM).
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    [1] . Schdlbauer D, Speer P, Triftshuser W. Nucl. Instrum.Methods, 1988, B34: 2582. Lynn K G, Frieze W E, Schultz P J. Phys. Rev. Lett., 1984,52: 11373. Stanislaw S, Mihail P P, Kelvin G L. Review of Scientific Instruments, 2002, 73: 1474. Suzuki R, Kobayashi Y, Mikado T et al. Japanese Journal of Applied Physics, 1991, 30(3B): L5325. WANG Bao-Yi, CAO Xing-Zhong, WEI Long et al. Materials Science Forum, 2004, 445-446: 5136. CAO Xing-Zhong, WANG Bao-Yi, WEI Long et al. Nuclear Techniques, 2004, 27: 4357. YU Run-Sheng, WANG Bao-Yi, MA Chuang-Xin et al.High Energy Phys. Nucl. Phys., 2001, 25(Supp.): 135(in Chinese)(于润生,王宝义,马创新等.高能物理与核物理,2001,25(增刊):135)8. Iijima H, Asonuma T, Hirose T et al. Nuclear Instruments and Methods in Physics Research, 2002, A483: 6419. Willutzki P, Strmer J, Kgel G et al. Materials Science Forum, 1995, 175-178: 23710. L Jian-Qin, QUAN Sheng-Wen. Atomic Energy Science and Technology, 1995, 29(2): 102(in Chinese)(吕建钦,全胜文.原子能科学技术,1995, 29(2): 102)11. ZU Xiu-Lan, YANG Hai-Su, LOU Ben-Chao et al. High Power Laser and Particle Beams, 2004, 16(7): 950(in Chinese)(祖秀兰,杨海索,娄本超等.强激光与粒f束,2004, 16(7):950)12. Branch C M. I. R. E. Trans ED-8., 1961, 19313. Young L M et al. LA-UR-96-1835, Los Alamos National Laboratory, Revised July 30, 200214. James H B, Lloyd M Y. Possion Super sh: A-UR-96-1834.Los Alamos National Laboratory

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MA Yan-Yun, PEI Shi-Lun, CAO Xing-Zhong, WANG Ping, WEI Cun-Feng, MA Chuang-Xing, ZHANG Zhi-Ming, WANG Shu-Hong, WANG Bao-Yi and WEI Long. Design of a Pulsed Low Energy Positron System Based on Beijing Intense Slow Positron Beam[J]. Chinese Physics C, 2006, 30(2): 166-170.
MA Yan-Yun, PEI Shi-Lun, CAO Xing-Zhong, WANG Ping, WEI Cun-Feng, MA Chuang-Xing, ZHANG Zhi-Ming, WANG Shu-Hong, WANG Bao-Yi and WEI Long. Design of a Pulsed Low Energy Positron System Based on Beijing Intense Slow Positron Beam[J]. Chinese Physics C, 2006, 30(2): 166-170. shu
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Received: 2005-05-10
Revised: 2005-07-11
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Design of a Pulsed Low Energy Positron System Based on Beijing Intense Slow Positron Beam

    Corresponding author: MA Yan-Yun,
  • Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, CAS, Beijing 100049, China2 Accelerator Center, Institute of High Energy Physics, CAS, Beijing 100049, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received Date: 2005-05-10
  • Accepted Date: 2005-07-11
  • Available Online: 2006-02-05

Abstract: The design of a pulsing system for an intense slow positron beam is described in this paper. Slow positron annihilation lifetime measurement is an important method to study the depth-dependent characteristics of the surface and near surface. The start signal for slow positron lifetime measurement can be obtained from the pulsing system, which consists of a reflection type chopper, a prebuncher and a buncher. On the basis of the simulation of dynamics process by Parmela, the frequency of the buncher and the positron energy have been chosen to be 150MHz and 330eV respectively. The designed time resolution of this system is about 150ps (FWHM).

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