Dense pair plasma generation by two laser pulses colliding in a cylinder channel  

作　　者：刘建勋 马燕云 余同普 赵军 杨晓虎 邹德滨 张国博 赵媛 杨靖康 李汉臻 卓红斌 邵福球 Shigeo Kawata 

机构地区：[1]College of Science, National University of Defense Technology, Changsha 410073, China [2]College of Electronic Engineering, Wuhan 430019, China [3]IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China [4]Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621000, China [5]Center for Optical Research and Education, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yohtoh, Utsunomiya 321-8585, Japan

出　　处：《Chinese Physics B》2017年第3期361-368,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation(Grant Nos.11475260,11305264,11622547,11375265,and 11474360);the National Basic Research Program of China(Grant No.2013CBA01504);the Research Project of National University of Defense Technology,China(Contract No.JC14-02-02);the Science Challenge Program,China(Grant No.JCKY2016212A505)

摘　　要：An all-optical scheme for high-density pair plasmas generation is proposed by two laser pulses colliding in a cylinder channel. Two dimensional particle-in-cell simulations show that, when the first laser pulse propagates in the cylinder, electrons are extracted out of the cylinder inner wall and accelerated to high energies. These energetic electrons later run into the second counter-propagating laser pulse, radiating a large amount of high-energy gamma photons via the Compton back-scattering process. The emitted gamma photons then collide with the second laser pulse to initiate the Breit-Wheeler process for pairs production. Due to the strong self-generated fields in the cylinder, positrons are confined in the channel to form dense pair plasmas. Totally, the maximum density of pair plasmas can be 4.60 × 10^27 m%-3, for lasers with an intensity of 4 × 10^22 W.cm^-2. Both the positron yield and density are tunable by changing the cylinder radius and the laser parameters. The generated dense pair plasmas can further facilitate investigations related to astrophysics and particle physics.An all-optical scheme for high-density pair plasmas generation is proposed by two laser pulses colliding in a cylinder channel. Two dimensional particle-in-cell simulations show that, when the first laser pulse propagates in the cylinder, electrons are extracted out of the cylinder inner wall and accelerated to high energies. These energetic electrons later run into the second counter-propagating laser pulse, radiating a large amount of high-energy gamma photons via the Compton back-scattering process. The emitted gamma photons then collide with the second laser pulse to initiate the Breit-Wheeler process for pairs production. Due to the strong self-generated fields in the cylinder, positrons are confined in the channel to form dense pair plasmas. Totally, the maximum density of pair plasmas can be 4.60 × 10^27 m%-3, for lasers with an intensity of 4 × 10^22 W.cm^-2. Both the positron yield and density are tunable by changing the cylinder radius and the laser parameters. The generated dense pair plasmas can further facilitate investigations related to astrophysics and particle physics.

关 键 词：pair plasma laser pulse simulation 

分 类 号：O53[理学—等离子体物理]