Modeling ion interpenetration, stagnation, and thermalization in colliding plasmas

Ion interpenetration, stagnation, and energization processes are studied in colliding laser‐produced plasma configurations relevant to Trident [R. G. Watt, Rev. Sci. Instrum. 64, 1770 (1993)] experiments using four different numerical methods: one‐dimensional Monte Carlo and Lagrangian multifluid codes, and one‐ and two‐dimensional hybrid (particle ions, fluid electrons) and single‐fluid Lagrangian codes. Results from the four methodologies are compared for plasmas generated with gold and deuterated polyethylene (CD2) targets. Overall, the various codes give similar results concerning the initial expansion of the plasmas and their collisional interaction, the degree of stagnation, stagnation time, and amount of ion thermalization for gold targets, while multispecies techniques indicate a much softer stagnation for CD2 plasmas than the single‐fluid model. Variations in the results of the calculations due to somewhat different initializations and parameters, as well as to different physics in the codes, are...

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