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Active feedback stabilization of axisymmetric modes in highly elongated tokamak plasmas

D.J. Ward, F. Hofmann1994年被引用 21Nuclear FusionIF 3出版社

Active feedback stabilization of the vertical instability is studied for highly elongated tokamak plasmas (2 ⩽ κ ⩽ 3) and evaluated in particular for the TCV configuration. It is shown that the feedback can strongly affect the form of the eigenfunction for these highly elongated equilibria, and this can have detrimental effects on the ability of the feedback system to detect properly and stabilize the plasma. A calculation of the vertical displacement that uses poloidal flux measurements, poloidal magnetic field measurements, and corrections for the vessel eddy currents and active feedback currents was found to be effective even in the cases with the worst deformations of the eigenfunction. These deformations are also examined to determine how they affect equilibria with various degrees of shaping, and it is seen that the magnitude of the deformation of the eigenfunction is a strong function of the plasma elongation

日本語訳

高細長トカマクプラズマ(2 ⩽ κ ⩽ 3)における垂直不安定性のフィードバック安定化を研究し、特にTCV配位について評価する。フィードバックがこれらの高細長平衡における固有関数の形状に強く影響を及ぼし得ること、またこれがフィードバック系の正確な検出およびプラズマ安定化能力に悪影響を及ぼし得ることが示される。ポロイダル磁束測定、ポロイダル磁場測定、ならびに容器渦電流およびフィードバック電流に対する補正を用いた垂直変位の計算は、固有関数の最悪の変形を伴う場合においても有効であることが判明した。これらの変形が様々な形状の平衡にどのように影響するかも調べられ、固有関数の変形の大きさがプラズマ伸長度の強い関数であることが確認される。

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