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Stability of global modes in advanced plasma confinement configurations

A.C. Coppi, B. Coppi1992年被引用 11Nuclear FusionIF 3出版社

Internal global modes, with the lowest wave numbers, can be excited in a magnetically confined plasma column during the process of approaching the fusion ignition regime and possibly prevent reaching this regime. The conditions under which the onset of ideal MHD modes of this kind (m0=1, n0=1) can be suppressed are analysed numerically in terms of plasma pressure and current density profiles that are consistent with those of present day experiments, for strongly shaped plasma configurations with tight aspect ratio. The severity of these conditions (considerably lower values of poloidal beta than previously assumed) may force ignition experiments to adopt, in effect, smaller plasma currents than presently planned, in order to reduce the size of the region affected by the considered mode. This is in contrast with the requirement of very high plasma currents to prevent an excessive enhancement of the plasma thermal energy transport due to microscopic processes

日本語訳

内部大域モードは、最も低い波数を持つものであるが、磁気閉じ込めプラズマ柱において核融合点火領域への接近過程で励起され得、この領域への到達を妨げる可能性がある。この種の理想MHDモード(m0=1、n0=1)の発生が抑制される条件は、現在の実験と整合するプラズマ圧力および電流密度分布に関して、強く成形されたプラズマ配位と緊密なアスペクト比を持つ構成に対して数値的に解析された。これらの条件の厳しさ(ポロイダルベータ値が従来想定よりもかなり低いこと)により、点火実験は、当該モードの影響を受ける領域の規模を縮小するために、実際には現在計画されているよりも小さなプラズマ電流を採用せざるを得ない可能性がある。これは、微視的過程によるプラズマ熱エネルギー輸送の過度な増大を防ぐために非常に高いプラズマ電流が必要であるという要求とは対照的である。

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