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Simulation study of the self-reversal process in the reversed-field pinch based on a non-linearly driven reconnection model

K. Kusano, T. Sato1986年被引用 48Nuclear FusionIF 3出版社

The self-reversal process in the reversed-field pinch is studied in detail by means of a resistive magnetohydrodynamic simulation. It is confirmed that self-reversal can be caused by non-linearly driven reconnection resulting from the m = 1 global kink instability, as was previously proposed by the authors. The dependence of the degree of field reversal on the pinch parameter θ and on the instability mode (resonant and non-resonant) is examined. The results are consistent with theoretical predictions. Taylor's conjecture that the total helicity is a better conserved quantity than the total magnetic energy during the relaxation process is numerically confirmed. It is found that this conjecture can be consistently explained by the non-linearly driven reconnection model. It is also found that the single helicity relaxation process has a definite energy offset from Taylor's minimum energy state. Hence, a totally relaxed state cannot be achieved through the single helicity relaxation process. Finally, the dependence of the reversal process on the resistivity is examined

日本語訳

反転磁場ピンチにおける自己反転過程を、抵抗性磁気流体力学シミュレーションにより詳細に調べた。自己反転は、著者らが以前に提案したように、m = 1 の大域的キンク不安定性に起因する非線形駆動リコネクションによって引き起こされ得ることを確認した。磁場反転の程度のピンチパラメータ θ および不安定性モード(共鳴および非共鳴)への依存性を調べた。結果は理論的予測と一致する。緩和過程の間、全磁気エネルギーよりも全ヘリシティの方がより良く保存される量であるという Taylor の予想を数値的に確認した。この予想は非線形駆動リコネクションモデルによって一貫して説明できることが分かった。また、単一ヘリシティ緩和過程は Taylor の最小エネルギー状態から明確なエネルギーオフセットを持つことも分かった。したがって、完全に緩和した状態は単一ヘリシティ緩和過程を通じては達成され得ない。最後に、反転過程の抵抗率への依存性を調べた。

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Reversed field pinchMagnetic reconnection
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