低一周抵抗化したトカマク装置HT-2におけるディスラプション時のプラズマ電流減衰特性

概要

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Experiments with two different vacuum vessel loop resistances Ω_V were carried out to examine the characteristics of disruptive plasma current decay in the HT-2 tokamak. The resistance Ω_V was originally high (14mΩ), but Ω_V was modified to have a low Ω_V of 0.3mΩ, which was less than the plasma loop resistance calculated at electron temperature 5eV. The disruptive plasma current decay can be divided into two phases. During the first phase, the plasma has a magnetic axis and closed flux surfaces. Modification of the resistance does not affect disruptive characteristics in this phase. During the second phase, the plasma has no closed flux surface and a rapid thermal energy loss occurs from the plasma. Consequently the plasma loop resistance becomes larger than the modified Ω_V and replacement of the toroidal current from the plasma to the vacuum vessel occurs at the start of this phase. The Ω_V modification does not affect the total force on the plasma, but it does change the spatial distribution and local force direction. The main toroidal vessel current component is a uniform component in the poloidal distribution.
社団法人プラズマ・核融合学会の論文
1995-07-25