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Disruption forces on the tokamak wall with and without poloidal currents

V D Pustovitov2017年Plasma Physics and Controlled FusionIF 2.2出版社

The contributions into the disruption radial force on the tokamak vacuum vessel wall are calculated and analyzed. One is due to the induced toroidal current in the wall, and another is due to the poloidal current. The latter is not accounted for in the models that represent the wall as a set of isolated toroidal filaments. It is shown that such modeling must lead to significant errors in the evaluation of the force during either thermal or current quench. The analytical derivations are performed here for an arbitrary tokamak configuration with final estimates for a circular large-aspect-ratio plasma and a coaxial wall reacting on perturbations as a perfect conductor. The results are compared with those recently obtained numerically by the codes DINA, MAXFEA and CarMa0NL. The discrepancies between the DINA simulations (Khayrutdinov et al 2016 Plasma Phys. Control. Fusion58 115012) and earlier analytical predictions are explained. The recent conclusion (Villone et al 2015 Fusion Eng. Des.93 57) on the role of the disruption-induced poloidal current in the wall is confirmed and extended to a wider area.

日本語訳

トカマク真空容器壁にかかるディスラプション半径方向力への寄与を計算し、解析した。1つは壁に誘起されるトロイダル方向電流によるものであり、もう1つはポロイダル方向電流によるものである。後者は、壁を一連の孤立したトロイダルフィラメントとして表すモデルでは考慮されていない。このようなモデル化は、熱クエンチまたは電流クエンチ中の力の評価において重大な誤差を招くことが示される。ここでは、任意のトカマク配位に対する解析的導出を行い、円形大アスペクト比プラズマと、完全導体として摂動に応答する同軸壁に対する最終的な評価を与える。結果は、コードDINA、MAXFEA、CarMa0によって最近数値的に得られた結果と比較される。DINAシミュレーション(Khayrutdinovら 2016, Plasma Phys. Control. Fusion 58 115012)と従来の解析的予測との間の不一致が説明される。壁におけるディスラプション誘起ポロイダル方向電流の役割に関する最近の結論(Villoneら 2015, Fusion Eng. Des. 93 57)は確認され、より広い領域に拡張される。

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