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Ideal and resistive interchange instabilities in negative shear tokamaks and currentless heliotron plasmas

M. Furukawa, Y. Nakamura, M. Wakatani, K. Ichiguchi1999年被引用 4Nuclear FusionIF 3出版社

For tokamaks the ideal localized interchange mode does not play a role for cases of q (safety factor) >1 over the whole plasma region, whereas in heliotron plasmas the mode becomes unstable in the edge region owing to the magnetic hill. However, for negative shear tokamaks, the resistive localized interchange mode becomes unstable where q0 is much larger than qmin, where q0 (qmin) is the central (minimum) q value. With the appropriate ellipticity and triangularity the stability against the resistive interchange mode is significantly improved. It is also shown that ideal and resistive non-resonant global interchange modes appear easily in the central region of heliotrons and in negative shear tokamaks; the modes are similar to the infernal mode in low shear tokamaks.

日本語訳

トカマクでは、理想的な局所交換モードは、プラズマ全域でq(安全係数)>1の場合には役割を果たさないが、ヘリオトロンプラズマでは、磁気井戸のために端部領域でモードが不安定になる。しかし、負のシアを有するトカマクでは、q0がqminよりもはるかに大きい場合、抵抗性局所交換モードが不安定になる。ここで、q0(qmin)は中心(最小)q値である。適切な楕円度と三角形度により、抵抗性交換モードに対する安定性は大幅に改善される。また、理想および抵抗性の非共鳴大域交換モードは、ヘリオトロンの中心領域および負のシアを有するトカマクで容易に現れることも示される。これらのモードは、低シアトカマクにおけるインフェルナルモードに類似している。

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