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Thermal quench and current profile relaxation dynamics in massive-material-injection-triggered tokamak disruptions

E Nardon, D Hu, F J Artola, D Bonfiglio, M Hoelzl, A Boboc, P Carvalho, S Gerasimov, G Huijsmans, V Mitterauer2021年Plasma Physics and Controlled FusionIF 2.2出版社

3D non-linear magnetohydrodynamic simulations of a disruption triggered by a massive injection of argon gas in JET are performed with the JOREK code. The key role of the thermal drive of the m = 2, n = 1 tearing mode (i.e. the drive from helical cooling inside the island) in the disruption process is highlighted by varying the amplitude and position of the argon source across simulations, and also during a simulation. In cases where this drive persists in spite of the development of magnetic stochasticity, which is favoured by moving the argon source in an ad hoc way from the plasma edge into the 2/1 island at some point in the simulation, a relaxation in the region (roughly) takes place. This relaxation generates a plasma current spike comparable to the experimental one. Simulations are compared in detail to measurements via synthetic diagnostics, validating the model to some degree.

日本語訳

3次元非線形磁気流体力学シミュレーションを、JETにおけるアルゴンガスの大規模注入によって引き起こされるディスラプションに対してJOREKコードを用いて実施した。m = 2、n = 1テアリングモードの熱的駆動(すなわち、島内部の螺旋冷却による駆動)がディスラプション過程において果たす重要な役割を、アルゴン源の振幅と位置を変化させることによって、またシミュレーション中にも変化させることによって明らかにした。磁気確率化の発達にもかかわらずこの駆動が持続する場合(これはシミュレーションのある時点でアルゴン源をプラズマ端から2/1島へ人為的に移動させることによって促進される)、領域(おおよそ)において緩和が発生する。この緩和は、実験と同等のプラズマ電流スパイクを生成する。シミュレーション結果は合成診断を介して測定値と詳細に比較され、モデルがある程度検証された。

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