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The separatrix response of diverted TCV plasmas compared with the predictions of the CREATE-L model

P. Vyas, F. Villone, J.B. Lister, R. Albanese1998年被引用 19Nuclear FusionIF 3出版社

The response of ohmic, single null diverted (SND), non-centred plasmas in TCV to poloidal field coil stimulation has been compared with the predictions of the linear CREATE-L MHD equilibrium response model. The closed loop responses of directly measured quantities, reconstructed parameters and the reconstructed plasma contour have all been examined. Provided that the plasma position and shape perturbation were small enough for the linearity assumption to hold, agreement between the model and experiment was good. For some stimulations the open loop vertical position instability growth rate changed significantly. This led to oscillations in the vertical position that were unpredicted and illustrated the limitations of a linear model. A different model was developed with the assumption that the flux at the plasma boundary is frozen and the predictions of this model were also compared with experimental results. It proved not to be as reliable as the CREATE-L model for some simulation parameters, showing that the experiments were able to discriminate between different plasma response models. The closed loop response was also found to be sensitive to changes in the modelled plasma shape. It was not possible to invalidate the CREATE-L model, despite the extensive range of responses excited by the experiments.

日本語訳

オーミック加熱、シングルヌルダイバータ(SND)、非中心プラズマにおけるTCVのポロイダル磁場コイル刺激に対する応答を、線形CREATE-L MHD平衡応答モデルの予測と比較した。直接測定された量、再構成されたパラメータ、および再構成されたプラズマ形状の閉ループ応答をすべて検討した。線形性の仮定が成立するのに十分にプラズマ位置と形状の摂動が小さい場合、モデルと実験の間の一致は良好であった。いくつかの刺激では、開ループ垂直位置不安定性の成長率が有意に変化した。これにより、予測されなかった垂直位置の振動が生じ、線形モデルの限界が明らかになった。プラズマ境界における磁束が凍結されているという仮定に基づいて異なるモデルが開発され、このモデルの予測も実験結果と比較された。いくつかのシミュレーションパラメータにおいて、このモデルはCREATE-Lモデルほど信頼性が高くないことが判明し、実験が異なるプラズマ応答モデルを識別できることが示された。閉ループ応答は、モデル化されたプラズマ形状の変化に対しても敏感であることが判明した。実験によって励起された広範な応答にもかかわらず、CREATE-Lモデルを無効化することはできなかった。

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