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

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; WEI Long

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

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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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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.

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Received: 2005-05-10
Revised: 2005-07-11

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沈阳化工大学材料科学与工程学院沈阳 110142

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).