| 基于北京慢正电子强束流的微脉冲化系统设计 |
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| 引用本文： | 马雁云,裴士伦,曹兴忠,王平,魏存峰,马创新,章志明,王书鸿,王宝义,魏龙.基于北京慢正电子强束流的微脉冲化系统设计[J].中国物理 C,2006,30(2):166-170. |
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| 作者姓名： | 马雁云 裴士伦 曹兴忠 王平 魏存峰 马创新 章志明 王书鸿 王宝义 魏龙 |
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| 作者单位： | [1]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 [2]中国科学院高能物理研究所加速器中心,北京100049 [3]中国科学院研究生院,北京100049 |
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| 基金项目： | 中国科学院资助项目
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中国科学院仪器研制与改造项目 |
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| 摘 要： | 慢正电子湮没寿命测量是研究材料表面微观缺陷的重要分析方法．束团化系统是实现慢正电子湮没寿命测量的核心部件, 主要由斩波、聚束两部分组成, 它可以将随时间连续分布的束流束团化, 从而获得正电子湮没寿命测量的时间起点及满足时间分辨率要求的束团．本文以粒子动力学计算为基础, 完成了束团化系统的物理设计, 其时间分辨率设计值为150ps(FWHM)．
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| 关 键 词： | 慢正电子湮没寿命测量 束团化 斩波 聚束 时间分辨率 能散 |
| 收稿时间： | 2005-05-10 |
| 修稿时间： | 2005-05-10 |
Design of a Pulsing System for 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-Xin,ZHANG Zhi-Ming,WANG Shu-Hong,WANG Bao-Yi,WEI Long.Design of a Pulsing System for Beijing Intense Slow Positron Beam[J].High Energy Physics and Nuclear Physics,2006,30(2):166-170. |
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| Authors: | MA Yan-Yun PEI Shi-Lun CAO Xing-Zhong WANG Ping WEI Cun-Feng MA Chuang-Xin ZHANG Zhi-Ming WANG Shu-Hong WANG Bao-Yi WEI Long |
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| Affiliation: | 1 .Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, CAS, Beijing 100049, China; 2 .Accelerator Center, Institute of High Energy Physics, CAS, Beijing 100049, China; 3 .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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| Keywords: | slow positron annihilation lifetime measurement pulsing system chopper buncher time resolution energy spread |
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