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Plasma flux expansion control on the DIII-D tokamak

H Anand, D Humphreys, D Eldon, A Leonard, A Hyatt, B Sammuli, A Welander2021年Plasma Physics and Controlled FusionIF 2.2出版社

A new controller has been developed with help of the flexible divertor poloidal-field coil set of the DIII-D tokamak, to aid in the precise control of the flux expansion in the scrape-off layer. The single-input multiple-output architecture ensures flexibility through a complementary set of orthogonal actuator direction to guarantee minimum effect on existing controlled variables, e.g. radial and vertical position control of the X-point. A non-linear free-boundary simulation code (GSevolve) is used for simulating the closed-loop response and for verifying the implementation of the control algorithm on the DIII-D plasma control system. First results of the experimental commissioning of the new controller during 2020 DIII-D campaign are also presented.

日本語訳

DIII-Dトカマクのフレキシブルなダイバータ・ポロイダル磁場コイル群を活用した新しい制御器が開発され、スクレイプオフ層におけるフラックス膨張の精密制御を支援する。単入力多出力アーキテクチャは、直交するアクチュエータ方向の相補的なセットを通じて柔軟性を確保し、既存の制御変数(例:X点の径方向および垂直方向位置制御)への影響を最小限に保証する。非線形自由境界シミュレーションコード(GSevolve)を用いて、閉ループ応答のシミュレーションと、DIII-Dプラズマ制御システムへの制御アルゴリズム実装の検証を行う。2020年のDIII-Dキャンペーン中における新制御器の実験的コミッショニングの初期結果も併せて提示する。

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