「固体水素ペレット入射によるプラズマ粒子補給の数値計算」

概要

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Density increase by pellet injection into magnetically confined plasmas is an interesting subject from the point of view of the transport problem. Ablation process of the pellet is analyzed by the shielded neutral ablation model developed by Milora and Foster. A self-limiting ablation process is also taken into account to find a particle deposition profile. It is shown that optimization of both the pellet size and velocity according to plasma parameters of the target plasma is required to increase density efficiently.<BR>The particle deposition profile is coupled with the numerical code to study the transport process in a tokamak and a heliotron. The pellet injection into an ohmically heated plasma of ISX-B tokamak is studied by our code and good agreement between the numerical results and the experimental data is obtained.<BR>Pelet injection into a currentless NBI heated plasma of Heliotron E is studied and time evolutions of density, temperature and pressure profiles are demonstrated. When beta value increases by the pellet injection, MHD stability against the pressure-driven mode becomes an important criterion to determine the pellet size and velocity. In other words the pressure profile can be controlled by the pellet injection.
社団法人プラズマ・核融合学会の論文