極低アスペクト比トカマク,ULART(Ultra Low Aspect Ratio Takamak)の魅力

概要

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The MHD characteristics of an ultra-10w aspect ratio tokamak (ULART) are reviewed. One way of attaining high beta tokamak plasmas in a cost-effective way is to construct an extremely low aspect ratio tokamak with copper based toroidal coils. It is considered a possible candidate for a neutron generating test reactor. A Iow aspect ratio tokamak can confine a high p plasma within the first stability regime through naturally large elongation at a modest poloidal beta. It is also expected to possess strong toroidicity effects, which are often responsible for MHD stability. This configuration has geometrical similarity with a spheromak or an FRC (Field Reversed Configuration) . A small current in the center conductor (compared with the plasma current) is found to significantly improve the overall MHD stability characteristics of the formed plasmas by effectively stabilizing the global tilt/shift mode. Theoretical calculations of the threshold toroidal field current required for stability and the growth rates of the n = 1(n = toroidal mode number) global modes agree well with the TS-3 data. In this mini-review, the global MHD characteristics of the ULART configuration are primarily discussed.
社団法人プラズマ・核融合学会の論文
1996-03-25