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Stabilization by resistive walls and q-limit disruptions in tokamaks

A. Bondeson, M. Persson1988年被引用 39Nuclear FusionIF 3出版社

Stabilization of the m = 2/n = 1 tearing mode by resistive walls is effective in tokamaks at low-q operation, 2 < q ⪅ 2.6, when the mode rotates quickly compared with the time constant of the wall and with resistive growth times. A sharp stability limit at qa ≈ 2 results from the loss of wall stabilization when the q = 2 surface moves out of the conducting plasma. This stability limit correlates well with the experimentally observed disruptive limit in plasma current. Simulations of wall locking initiating a disruption at the qa = 2 limit show very short precursors in comparison with density limit disruptions at high qa.

日本語訳

抵抗性壁によるm = 2/n = 1テアリングモードの安定化は、低q運転時(2 < q ⪅ 2.6)のトカマクにおいて、モードが壁の時定数および抵抗性成長時間と比較して速く回転する場合に有効である。q = 2面が導電性プラズマの外側へ移動すると、壁安定化が失われることにより、qa ≈ 2で急峻な安定性限界が生じる。この安定性限界は、実験的に観測されるプラズマ電流の破壊限界とよく一致する。qa = 2限界における破壊を開始する壁ロッキングのシミュレーションでは、高qaでの密度限界破壊と比較して、非常に短い前駆現象が示される。

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