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Plasma circuit instability and density limit in Tokamaks

E Minardi1984年Plasma Physics and Controlled FusionIF 2.2出版社

The coupled system of the Ohm-Maxwell and transport equations is solved applying a 1-D code to the case of a one-fluid plasma in a cylindrical Tokamak. A situation is considered such that the current channel is surrounded by a large and cold boundary region with high thermal conductivity simulating the effect of strong cooling processes in the boundary zone. Introducing suitable boundary conditions on the interface a resistive instability exists (in addition to the thermal instability related to local overheating) which is related to marginal modes of the equation for the perturbed poloidal flux (plasma-circuit instability). The current shrinks and collapses on the axis on the time scale depending on the resistivity of the cold zone and on its width. If tau E approximately na2R the nonlinear evolution of the profiles is controlled by the parameter nqRU/B (U is the loop voltage) and a very steep gradient is developed at high density.

日本語訳

オーム・マクスウェル連立方程式と輸送方程式を、円筒トカマクにおける単一流体プラズマの場合に1次元コードを適用して解いた。電流チャネルが、強い冷却過程の効果を模擬する高い熱伝導率を持つ大きな低温境界領域に囲まれた状況を考える。界面に適切な境界条件を課すと、局所的な過熱に関連する熱的不安定性に加えて、摂動ポロイダル磁束の方程式の臨界モードに関連する抵抗性不安定性(プラズマ・回路不安定性)が存在する。電流は、低温領域の抵抗率とその幅に依存する時間スケールで収縮し、軸上で崩壊する。τ ≈ na²の場合、非線形発展のプロファイルはパラメータnqRU/B(Uはループ電圧)によって支配され、高密度では非常に急峻な勾配が形成される。

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Density limit
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