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Magnetic and thermal relaxation in the reversed field pinch

P Martin1999年Plasma Physics and Controlled FusionIF 2.2出版社

The paper is devoted to a tutorial review of the relaxation process in reversed field pinch (RFP) plasmas. Both magnetic and thermal aspects of the relaxation process are discussed and the main models proposed to explain it in the framework of nonlinear magnetohydrodynamics are reviewed. Particular attention is paid to the bifurcation between single helicity and multiple helicity states which is present in the phase space of a quasirelaxed RFP. Experimental evidence of transitions between bifurcated states, observed in many experiments and leading to enhanced confinement regimes, are discussed and a possible explanation for them is proposed. The role of Prandtl number in controlling transitions is discussed.

日本語訳

本論文は、反転磁場ピンチ(RFP)プラズマにおける緩和過程に関するチュートリアル的総説である。緩和過程の磁気的側面と熱的側面の両方について議論し、非線形電磁流体力学の枠組みにおいてそれを説明するために提案された主要なモデルを概説する。特に、準緩和RFPの位相空間に存在する単一ヘリシティ状態と多重ヘリシティ状態の間の分岐に注目する。多くの実験で観測され、閉じ込め改善領域をもたらす分岐状態間の遷移について議論し、それに対する可能な説明を提案する。また、遷移を制御する上でのプランドル数の役割についても議論する。

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Reversed field pinch
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