Density filament and helical field line structures in three dimensional Weibel-mediated collisionless shocks

8th International Conference on Inertial Fusion Sciences and Applications

Moritaka, Toseo^1 ; Sakawa, Youichi^2 ; Kuramitsu, Yasuhiro^1 ; Morita, Taichi^3 ; Yamaura, Yuta^2 ; Ishikawa, Taishi^2 ; Takabe, Hideaki^2

Department of Physics, National Central University, Taoyuan City, Taiwan^1

Institute of Laser Engineering, Osaka University, Osaka, Japan^2

Department of Energy Engineering Science, Kyushu University, Fukuoka, Japan^3

关键词: Collisionless shocks;    Experimental demonstrations;    Helical field lines;    High intensity lasers;    Magnetic field line;    Particle-in-cell simulations;    Three-dimensional structure;    Weibel instability;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012072/pdf
DOI  :  10.1088/1742-6596/688/1/012072

来源: IOP

【 摘 要 】

Collisionless shocks mediated by Weibel instability are attracting attention for their relevance to experimental demonstrations of astrophysical shocks in high-intensity laser facilities. The three dimensional structure of Weibel-mediated shocks is investigated through a fully kinetic particle-in-cell simulation. The structures obtained are characterized by the following features: (i) helical magnetic field lines elongated in the direction upstream of the shock region, (ii) high and low density filaments inside the helical field lines. These structures originate from the interaction between counter-streaming plasma flow and magnetic vortexes caused by Weibel instability, and potentially affect the shock formation mechanism.