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

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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

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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