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Weibel instability induced by kinetic stimulated Raman scattering in unmagnetized and magnetized plasmas

Y Z Zhou, C Y Zheng, Z J Liu, L H Cao2022年Plasma Physics and Controlled FusionIF 2.2出版社

The kinetic stimulated Raman scattering (SRS) is found to result in significant Weibel-generated magnetic fields via 2D particle-in-cell simulations. During the high-intensity laser pulse, the daughter electron plasma waves of SRS heat the electrons effectively and lead to anisotropy in the velocity space. This anisotropy results in the development of a quasi-static magnetic field near the laser speckle, and the growth rate has been discussed. The results show that the kinetic SRS can lead to an averaged magnetic field of more than 10 T, which can be an important magnetic field source in laser-plasma experiments. Besides, the energy of the Weibel-field undergoes an oscillatory rise with the SRS bursts and can be stable after cutting off the laser. Moreover, in the magnetized plasmas, the application of a longitudinal magnetic field enhances the SRS, but interestingly, it significantly reduces the growth rate of Weibel instability. Simulation results also indicate that a small transverse magnetic field can evidently change the motion of the hot electrons, which dramatically destroys the symmetry of the SRS and the Weibel-generated magnetic fields.

日本語訳

運動論的誘導ラマン散乱(SRS)は、2次元粒子セルシミュレーションにより、有意なワイベル生成磁場をもたらすことが見出された。高強度レーザーパルス中、SRSの娘電子プラズマ波は電子を効果的に加熱し、速度空間における異方性を導く。この異方性は、レーザースペックル近傍での準静磁場の発生をもたらし、その成長率について議論がなされた。結果は、運動論的SRSが10Tを超える平均磁場を生じ得ることを示しており、これはレーザープラズマ実験において重要な磁場源となり得る。さらに、ワイベル磁場のエネルギーはSRSのバーストに伴って振動的に増加し、レーザーを切った後は安定化し得る。また、磁化プラズマにおいて、縦方向磁場の印加はSRSを増強するが、興味深いことにワイベル不安定性の成長率を有意に低減する。シミュレーション結果はさらに、小さな横方向磁場が高温電子の運動を明確に変化させ得ることを示しており、これによりSRSおよびワイベル生成磁場の対称性が劇的に破壊される。

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Magnetized plasmaRaman scatteringStimulated Raman scatteringWeibel instability
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