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Asymmetric toroidal flux generation due to phase locking of internally resonant tearing modes in the RELAX reversed-field pinch

R Ikezoe, S Masamune, K Oki, A Sanpei, H Himura, T Onchi, A Hirose2013年Plasma Physics and Controlled FusionIF 2.2出版社

Self-generation and sustainment of toroidal flux via a dynamo is one of the unique characteristics of the reversed-field pinch (RFP) configuration. In a small aspect ratio RFP machine RELAX, it has been observed that a sudden dynamo usually occurs at a localized toroidal location. This localized dynamo evolves in time, causing a toroidally asymmetric flux distribution. The degree of asymmetry depends on the location and propagation of the localized dynamo. It has been observed that the position where the localized dynamo occurs coincides with the position where the phases of the internally resonant tearing modes align. The phase alignment plays an important role in triggering a localized dynamo activity and in the formation of asymmetric toroidal flux distribution especially in deep-reversal plasmas in RELAX.

日本語訳

自己生成およびダイナモによるトロイダル磁束の維持は、逆転磁場ピンチ(RFP)配位の独特な特性の一つである。小アスペクト比RFP装置RELAXにおいて、突発的なダイナモが通常、局所的なトロイダル位置で発生することが観測されている。この局所的ダイナモは時間とともに発展し、トロイダル方向に非対称な磁束分布を引き起こす。その非対称性の程度は、局所的ダイナモの位置と伝播に依存する。局所的ダイナモが発生する位置は、内部共鳴テアリングモードの位相が揃う位置と一致することが観測されている。この位相の整合は、局所的ダイナモ活動の誘発と、特にRELAXにおける深い磁場反転プラズマでの非対称トロイダル磁束分布の形成において重要な役割を果たす。

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Tearing modeReversed field pinch
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