純粋減少における磁気ミラ-からのイオン損失

概要

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An ion loss from a magnetic mirror under the effect of ambipolar potential is considered in a pure decay. An ion distribution function in velocity space at a given instant of time is estimated with results of numerical calculation of a full set of two dimensional Fokker-Planck equation. The estimated velocity distribution function is in good agreement with the results of the numerical calculation. And using this function, we obtained the ion loss-time from the two dimensional Fokker-Planck equation which is assumed that the velocity distribution of field particles is isotropic. In this calculation, it may also be explained that the longitudinal loss can not be negligible in comparison with the transverse ones on a large potential region. Finally, it is showed that the velocity shift Vs is necessary to determine the loss-time (see Fig. 10, 11).
社団法人プラズマ・核融合学会の論文