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Fluctuation-driven mean flows and their effect on the dynamo mechanism in the reversed-field pinch

J P Wainwright, M G Haines, C G Gimblett1995年Plasma Physics and Controlled FusionIF 2.2出版社

A computer simulation of a reversed-field pinch (RFP) has been used to model the phenomena of relaxation and sustained reversal. It is found that axisymmetric plasma flows are generated by the non-linear interaction of the dynamo modes and that these flows adjust the phases of the MHD resistive modes and act to increase the efficiency of the dynamo effect. However, these flows were not found to be essential to a functioning RFP. The quasi-linear description of the RFP is found to be inadequate and the dynamo modes were found to be highly correlated and possess a time-averaged component. The viscous damping of the dynamo modes is found to be related to the dynamo activity, consistent with this being the mechanism responsible for the observed anomalous ion heating.

日本語訳

反転磁場ピンチ(RFP)の数値シミュレーションを用いて、緩和と持続反転の現象をモデル化した。軸対称流はダイナモモードの非線形相互作用によって生成され、これらの流れがMHD抵抗性モードの位相を調整し、ダイナモ効果の効率を高めることが見出された。しかしながら、これらの流れは機能するRFPにとって必須ではないことも判明した。RFPの準線形記述は不十分であり、ダイナモモードは高度に相関し、時間平均成分を有することが見出された。ダイナモモードの粘性減衰はダイナモ活動と関連しており、これは観測された異常イオン加熱の機構と整合的である。

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Reversed field pinch
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