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2004•Materials science forumOpen access

The Slow Positron Beam Based on Beijing Electron-Positron Collider

Bao Yi Wang, Xingzhong Cao, Runsheng Yu, Cun Feng Wei, Zhiming Zhang, Chuang Xin, Tian Chang, Guo Xi Pei, Jianchun Li, Lin Zheng, Long Wei, Tian Min Wang, HE Yuan-jin, Wei Yu, Sheng Yun Zhu

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Abstract

Abstract. A slow positron beam line based on the 1.3 GeV linac of Beijing Electron-Positron Collider (BEPC) has been designed and constructed aiming to produce intense slow positron beam. By measuring the integral voltage of 0.511 MeV radiations using a home-made Pilot-U scintillation detector, a slow positron beam with intensity of 6×10 5 e /s and energy spread of less than 10 eV (FWHM) was identified before the penning trap section. With the finish of BEPC improvement project, the positron beam intensity could reach 10 8 e /s and the pulsing system for positron lifetime measurement is under construction.

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What this paper is about

Abstract. A slow positron beam line based on the 1.3 GeV linac of Beijing Electron-Positron Collider (BEPC) has been designed and constructed aiming to produce intense slow positron beam. By measuring the integral voltage of 0.511 MeV radiations using a home-made Pilot-U scintillation detector, a slow positron beam with intensity of 6×10 5 e /s and energy spread of less than 10 eV (FWHM) was identified before the penning trap section. With the finish of BEPC improvement project, the positron beam intensity could reach 10 8 e /s and the pulsing system for positron lifetime measurement is under construction.

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Available abstract

Abstract. A slow positron beam line based on the 1.3 GeV linac of Beijing Electron-Positron Collider (BEPC) has been designed and constructed aiming to produce intense slow positron beam. By measuring the integral voltage of 0.511 MeV radiations using a home-made Pilot-U scintillation detector, a slow positron beam with intensity of 6×10 5 e /s and energy spread of less than 10 eV (FWHM) was identified before the penning trap section. With the finish of BEPC improvement project, the positron beam intensity could reach 10 8 e /s and the pulsing system for positron lifetime measurement is under construction.

Key concepts: Positron, Materials science, Collider, Beijing, Electron, Nuclear physics, Beam (structure), Cathode ray

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