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脉冲慢正电子束流的直流化装置
引用本文:魏存峰,王宝义,王平,曹兴忠,章志明,马雁云,薛德胜,魏龙.脉冲慢正电子束流的直流化装置[J].中国物理 C,2006,30(10):1010-1013.
作者姓名:魏存峰  王宝义  王平  曹兴忠  章志明  马雁云  薛德胜  魏龙
作者单位:[1]兰州大学磁学与磁性材料教育部重点实验室,兰州730000 [2]中国科学院高能物理研究所核分析技术重点实验室,北京100049
摘    要:在基于加速器的北京慢正电子强束流装置上, 用Penning-Trap技术实现了脉冲慢正电子束流的存储和直流化. 实验表明, 系统的真空度对正电子的存储效率有严重影响, 脉冲正电子的释放方式决定了直流化后束流的能量分散; 改变释放级信号波形以及释放方式可以得到能量分散小于1eV的准直流化慢正电子束流.

关 键 词:彭宁离子阱  直流化  慢正电子束流  正电子湮没
收稿时间:2006-01-07
修稿时间:2006-01-07

A Device Used in Pulsed Slow Positron Beam's Stretching
WEI Cun-Feng,WANG Bao-Yi,WANG Ping,CAO Xing-Zhong,ZHANG Zhi-Ming,MA Yan-Yun,XUE De-Sheng,WEI Long.A Device Used in Pulsed Slow Positron Beam''''s Stretching[J].High Energy Physics and Nuclear Physics,2006,30(10):1010-1013.
Authors:WEI Cun-Feng  WANG Bao-Yi  WANG Ping  CAO Xing-Zhong  ZHANG Zhi-Ming  MA Yan-Yun  XUE De-Sheng  WEI Long
Institution:1.Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education of Lanzhou University, Lanzhou 730000, China 2.Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, CAS, Beijing 100049, China
Abstract:A slow positron beam's stretching device has been designed and constructed on Beijing Slow Positron Beam, which based on a 1.3GeV linac. Positron was storage and stretching use Penning-Trap technique. Measurements show that the positron storage time strongly depends on the vacuum level in Penning Trap tube. Two modes was used to release the positrons from storage part, lowering VC while VB kept constant and rising VB while VC kept constant. This technique makes the pulsed positron beam to a quasi-continuous beam. The energy spread of positrons depend on in release mode. In the latter mode, we observe that the energy spread was reduced to a value less than 1.0eV. The time profile in user-defined waveform is more uniform. It is beneficial to reduce the probability of amplifier pileup especially in the case of measurement with high counting rate.
Keywords:Penning-Trap  stretching  slow positron beam  positron annihilation
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