FRC緩和におけるイオン運動論効果の実験的検証

概要

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The ion kinetic or skin depth effect on the relaxation of merging spheromaks to a field-reversed configuration (FRC) was investigated experimentally using varied S^* (the average number of the ion skin depth) from 0.5 to 10. The merging spheromaks relax either to an FRC (λ_p〜0) or to another spheromak (λ_p〜λ_<Taylor>), depending on whether their initial poloidal eigen value λ_p was smaller or larger than the threshold value λ_0. The up-scaled TS-4 experiment under varied skin depths with several ion species revealed that the threshold value λ_0 for the relaxation to an FRC increased inversely with the S^* value. The decrease in S^* promoted the relaxation to an FRC, annihilating the magnetic helicity, in sharp contrast with the conventional Taylor relaxation. The low S^* relaxation to an FRC was observed to suppress the all low-n modes with the fast rotation of those modes.
社団法人プラズマ・核融合学会の論文
2004-07-25