X線レーザー源用超高密度プラズマの膨張:第1報, クーロン衝突の影響

概要

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Particle-in-cell simulation is carried out for the expansion of a multi-charged dense plasma for X-ray laser systems. All Coulomb collisions among charged particles are taken into consideration by using Nanbu's theory of Coulomb collisions[Phys, Rev.E55(1997)4642], together with our recent extension to the case when the weight assigned to a simulated particle varies from particle to particle [Trans.Jpn.Soc.Mech.Eng.64, B(1998), 2512]. The effect of Coulomb collisions on the expanding plasma is found to very large, e.g.the splitting of temperature components during the expansion is large reduced. The elecvtron temperature is nearly spatially uniform, and it decreases with time. The charge neutrality condition is broken near the ion front, and the electric field reaches its peak at the ion front. In the expanding region, the ion density decreases exponentially with radius γ, and the ion flow velocity increases linearly. These features of ions agree well with the self-similar hydrbyonamic solution for the planar expansion.
一般社団法人日本機械学会の論文
2000-01-25