Plasma particle-in-cell simulations with QED reactions for pair production experiments using a high-Z solid target

24th IUPAP Conference on Computational Physics

物理学;计算机科学

Moritaka, Toseo^1 ; Baiotti, Luca^1,2 ; Lin, An^1,2 ; Weiwu, Li^1,2 ; Sakawa, Youichi^1,2 ; Kuramitsu, Yasuhiro^1 ; Morita, Taichi^1 ; Takabe, Hideaki^1,2

Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, Japan^1

Graduate School of Science, Osaka University, Machikaneyama, Toyonaka, Osaka, Japan^2

关键词: Electron acceleration;    High energy plasmas;    High intensity lasers;    Laser-plasma interactions;    Monte carlo schemes;    Positron acceleration;    Relativistic plasmas;    Semi-Lagrangian scheme;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/454/1/012016/pdf
DOI  :  10.1088/1742-6596/454/1/012016

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

A new simulation scheme has been developed to investigate high-energy plasma phenomena including pair production and Bremsstrahlung in a high-Z nuclear field. The simulation scheme consists of (1) a Particle-in-Cell scheme for relativistic plasma dynamics, (2) a conservative semi-Lagrangian scheme for hard photon transport and (3) a Monte-Carlo scheme for the considered QED reactions. The developed scheme is applied to a test simulation relevant to recent experiments of positron production from a thin gold target irradiated by a high intensity laser. The simulation results successfully show a basic process leading to the positron ejection from the target. The process involves electron acceleration due to laser-plasma interaction at the target front, hard photon emission and pair production inside the target, and electrostatic positron acceleration at the target rear side.