4.相対論的レザ・プラズマ相互作用(2)(相対論的プラズマ物理学)

概要

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We start reviewing the relativistic effects when ultra-intense lasers are irradiated on low-density plasmas or solids. The strong current accompanied by laser propagation generates strong quasi-static magnetic fields, consequently confining the laser beam to form "super-channel". We review next the physical mechanism of production of relativistic high-energy electrons by focusing mainly on three different physical processes. Then, we proceed to explain the Weibel instability accompanied by magnetic field, when extremely high current over 100 MA by such high-energy electrons penetrates into over-dense region. The instability gets into nonlinear phase in a short time to break up the beam into many filaments and these beams tend to coalescence. The coalescence proceeds to form self-organized filaments in which the high-energy electrons are collimated in the core and the return current with thin sheath surrounding the core. One such filament can carry only the Alfven limit current. Consequent critical issue on the fast ignition is also summarized.
社団法人プラズマ・核融合学会の論文
2002-05-25