Effect of the magnetization parameter on electron acceleration during relativistic magnetic reconnection in ultra-intense laser-produced plasma  

作　　者：Qian Zhang Yongli Ping Weiming An Wei Sun Jiayong Zhong 张茜;平永利;安维明;孙伟;仲佳勇(Department of Astronomy,Beijing Normal University,Beijing 100875,China;CAS Key Laboratory of Geospace Environment,University of Science&Technology of China,Hefei 230026,China)

机构地区：[1]Department of Astronomy,Beijing Normal University,Beijing 100875,China [2]CAS Key Laboratory of Geospace Environment,University of Science&Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2022年第6期522-528,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.U1930108,12175018,12135001,12075030,and 11903006);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA25030700)。

摘　　要：Relativistic magnetic reconnection(MR)driven by two ultra-intense lasers with different spot separation distances is simulated by a three-dimensional(3D)kinetic relativistic particle-in-cell(PIC)code.We find that changing the separation distance between two laser spots can lead to different magnetization parameters of the laser plasma environment.As the separation distance becomes larger,the magnetization parameterσbecomes smaller.The electrons are accelerated in these MR processes and their energy spectra can be fitted with double power-law spectra whose index will increase with increasing separation distance.Moreover,the collisionless shocks’contribution to energetic electrons is close to the magnetic reconnection contribution withσdecreasing,which results in a steeper electron energy spectrum.Basing on the3D outflow momentum configuration,the energetic electron spectra are recounted and their spectrum index is close to 1 in these three cases because the magnetization parameterσis very high in the 3D outflow area.

关 键 词：collisionless shocks magnetic reconnection magnetization parameter electron acceleration 

分 类 号：TN248[电子电信—物理电子学] O53[理学—等离子体物理]