Filamentation due to the Weibel Instability in two counterstreaming laser ablated plasmas

[摘要] Weibel-type filamentation instability was observed in the interaction of two counter streaming laser ablated plasma flows, which were supersonic, collisionless, and closely relevant to astrophysical conditions. The plasma flows were created by irradiating a pair of oppositely standing plastic (CH) foils with 1ns-pulsed laser beams of total energy of 1.7 kJ in two laser spots. With characteristics diagnosed in experiments, the calculated features of Weibel-type filaments are in good agreement with measurements.

[发布机构] School of Physics and Optoengineerings, Ludong University, Yantai; 264025, China^1;Institute of Physics, CAS, Beijing; 100190, China^2;National Astronomical Observatories, CAS, Beijing; 100012, China^3;PPPL, Princeton University, Princeton; NJ; 08543, United States^4;National Laboratory on High Power Lasers and Physics, Shanghai; 201800, China^5;Key Laboratory for Laser Plasmas (MoE), Department of Physics, Shanghai Jiao Tong University, Shanghai; 200240, China^6

[关键词] Collisionless;Filamentation;Filamentation instabilities;Laser spots;Total energy;Weibel instability