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Real time magnetic control of the snowflake plasma configuration in the TCV tokamak

H. Anand, S. Coda, F. Felici, C. Galperti, J.-M. Moret, B. Labit, H. Reimerdes, R. Maurizio, the TCV Team2019年被引用 4Nuclear FusionIF 3出版社

The novel plasma position and shape controller of the TCV tokamak aids in the precise control of complex configurations such as snowflake (SF) divertors. The ability of the controller design to simultaneously control the position, shape, divertor leg and X-points is extended to various SF plasma configurations. The unique feature of ordering the controlled variables from the most easily to the least easily controlled, while respecting the hardware limits on the poloidal-field coil currents, is exploited in particular to provide reliable control of SF equilibria with closely spaced X-points, approaching the exact snowflake. The off-line optimisation of the control parameters and their experimental implementation on snowflake plasma configuration is reported. The performance of the new controller is compared with the legacy TCV analogue controller for a SF plasma discharge. The new controller is successful in providing a marked improvement over the legacy TCV controller with respect to , the main parameter of interest for this study.

日本語訳

TCVトカマクの新規プラズマ位置・形状制御器は、スノーフレーク(SF)ダイバータなどの複雑な配位の精密制御を可能にする。この制御器設計の特徴である、プラズマ位置、形状、ダイバータ脚、X点の同時制御能力は、様々なSFプラズマ配位へと拡張されている。ポロイダル磁場コイル電流に関するハードウェア制約を尊重しつつ、制御変数を最も制御しやすいものから最も制御しにくいものへと順序付けるという独自の特徴は、特に、完全なスノーフレークに近接した、X点間隔が狭いSF平衡の信頼性の高い制御を実現するために活用されている。制御パラメータのオフライン最適化と、スノーフレークプラズマ配位への実験的実装について報告する。新制御器の性能は、SFプラズマ放電において従来のTCVアナログ制御器と比較される。新制御器は、本研究の主要な関心パラメータである に関して、従来のTCV制御器に対する顕著な改善を達成することに成功している。

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