强激光与气体-固体复合靶相互作中γ射线产生的研究  

Generation of γ-rays in the interaction of an intense laser with gas-solid compound target

作　　者：亚生·尼亚孜 何洋 买买提艾力·巴克[2] YASIN Niyazi;HE Yang;MAMAT ALI Bake(Institute of Physics and Electrical Engineering,Kashi University,Kashgar Xinjiang 844000,China;School of Physics Science and Technology,Xinjiang University,Urumqi 830046,China)

机构地区：[1]喀什大学物理与电气工程学院,新疆喀什844000 [2]新疆大学物理科学与技术学院,乌鲁木齐830046

出　　处：《激光杂志》2025年第2期48-53,共6页Laser Journal

基　　金：国家自然科学基金地区项目(No.12265024);新疆少数民族科技人才特殊培养计划科研项目(No.2024D03007)。

摘　　要：通过理论和二维等离子体粒子模拟方法,研究了强激光与气体-固体复合靶相互作用中γ射线的产生。研究结果表明,向右传播的入射激光在等离子体中激发尾场并将电子加速到高能,随后被固体靶反射的激光与高能电子相互作用。向前传播的电子穿过固体靶后再与向左传播的入射激光相互作用。从而,在固体靶前后能产生具有不同长度、能量和延时的两束γ射线。研究激光偏振以及预等离子体密度对γ射线产生的影响并且讨论了其物理机制。研究结果表明,较高密度的预等离子体和圆偏振情况下可以产生更多的γ光子,并且所产生的光子具有小发散角和高通量的优点。Through the two-dimensional particle-in-cell simulations method,we investigate the generation of γ-rays in the interaction between ultraintensity lasers and gas-solid composite targets.The results show that,the laser wakefield are derived by the laser,the electrons are trapped and accelerated to high energy.The laser reflected by the solid target and interacts with the high-energy electrons.The electrons continue to propagate forward,pass through the solid target,then interacts with another incident laser propagating to the left.Consequently,two groups ofγrays with different lengths,energies and delays are generated.The effects of driving laser polarization and pre-plasma density onγrays are analyzed,and the physical mechanism is discussed.The results show that moreγphotons can be generated under the higher density pre-plasma and circularly polarized laser,and the resulting γ rays have the advantages of small divergence angle and high flux.

关 键 词：强激光脉冲 激光尾场加速 γ射线产生 等离子体粒子模拟 

分 类 号：O539[理学—等离子体物理]