南华大学学报（自然科学版）Issue(2)：14-19,6.
激光等离子体加速电子与固体靶相互作用产生相对论正电子的模拟计算
Positron Beam Generation by Simulation from Laser Plasma Accelerated Electron-Target Interaction
摘要
Abstract
Using theoretical analysis,a physical model and the resulting Geant4 simulation code were set up for producing relativistic positron beam from the interactions between laser-plasma-accelerated electrons and solid target. Using the 100 MeV-class electrons accelerated by laser interacting plasma as an input,the main characteristics of positron beam such as the positron yield,spectral and angular distributions were investigated by Monte Carlo simulation for different target materials and thicknesses. Simulation results show that gold and tantalum targets could be regarded as a good electron-positron converter. For metal targets with con-stant areal density,the positron yield was proportional to the fourth power of the atomic num-ber Z and varies inversely with the square of atomic mass A,i. e. Ne+∝(Z2/A)2. For differ-ent target materials,the positron yield has Ne+∝d2 ,and d is the target thickness,but exists an optimized target thickness. Compared to the scheme using hot electron interacting with solid target,the proposed scheme is beneficial for producing relativistic positrons with higher energy and smaller angular distribution,whose intensity approaches 107/shot.关键词
激光等离子体加速电子/相对论正电子/金属靶材/Geant4模拟程序Key words
laser plasma accelerated electron/relativistic positron beam/metallic material target/Geant4 code分类
数理科学引用本文复制引用
唐甜,罗文,周剑良,宋英明,朱志超,马燕云..激光等离子体加速电子与固体靶相互作用产生相对论正电子的模拟计算[J].南华大学学报（自然科学版）,2015,(2):14-19,6.基金项目
国家自然科学基金资助项目(11347028 （）
11405083) （）
湖南省自然科学基金资助项目(13JJ4074) （13JJ4074）
湖南省教育厅重点基金资助项目(13A080) （13A080）
南华大学博士启动基金资助项目(2012XQD57) （2012XQD57）
南华大学研究生创新课题基金资助项目(2014XCX17) （2014XCX17）
