强激光与粒子束2012，Vol.24Issue(6)：1396-1400,5.DOI:10.3788/HPLPB20122406.1396
超短超强激光产生正电子的蒙特卡罗模拟
Monte Carlo simulation on positron production by ultrashort ultraintense laser
摘要
Abstract
The Monte Carlo model and simulation code based on Geant4 for positron production in the interactions of ultra-intense laser and solid target are set up by theoretically analyses. The influence of the temperature of hot electrons and target parameters for positron production is investigated. Simulation results show that the gold target is the optimal choice among the six targets of different materials under investigation. The best thickness of the target for generating abundant positrons exists for a certain temperature of hot electrons. The positron yield will increase when the temperature of hot electrons increases. The positron angular distributions and energy spectra are presented. Most positrons are ejected in the normal direction at the back of the target and the positron energy spectra show quasi-Maxwell distributions. Finally, the dependence of the positron temperature on the temperature of hot electrons is presented.关键词
超短超强激光/超热电子/正电子/Geant4程序Key words
ultrashort ultraintense laser/ hot electron/positron/Geant4 code分类
数理科学引用本文复制引用
闫永宏,范伟,魏来,余金清,赵宗清,吴玉迟,谷渝秋,曹磊峰,姚泽恩,滕建,董克攻,刘东晓..超短超强激光产生正电子的蒙特卡罗模拟[J].强激光与粒子束,2012,24(6):1396-1400,5.基金项目
国家自然科学基金项目(10975121,10902051,10905051,11174259) （10975121,10902051,10905051,11174259）
中国工程物理研究院发展基金项目(2011B0102021,2009A0102003) （2011B0102021,2009A0102003）
等离子体物理重点实验室基金项目(9140C6802041004) （9140C6802041004）
