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A novel approach for mitigating disruptions using biased electrode in Aditya tokamak

Pravesh Dhyani, J. Ghosh, P.K. Chattopadhyay, R.L. Tanna, D. Raju, S. Joisa, Asim Kumar Chattopadhyay, Debjyoti Basu, N. Ramaiya, S. Kumar2014年被引用 26Nuclear FusionIF 3出版社

Disruptions, induced in Aditya tokamak by hydrogen gas puffing, are successfully mitigated through stabilization of magnetohydrodynamic (MHD) modes by applying a bias voltage to an electrode placed inside the last-closed flux surface prior to the gas injection. Above a threshold voltage sheared Er × Bφ rotation of the plasma generated by the edge biasing leads to substantial reduction in the growth of MHD modes (m/n = 3/1, 2/1), which causes avoidance of disruptions through prevention of mode overlapping and subsequent ergodization of magnetic field lines.

日本語訳

Adityaトカマクにおいて水素ガス噴射によって誘起されるディスラプションは、ガス噴射前に最終閉鎖磁気面の内側に配置された電極にバイアス電圧を印加することにより、磁気流体力学(MHD)モードを安定化させることで、首尾よく緩和される。閾値電圧を超えると、エッジバイアスによって生成されたプラズマのシア状Er×Bφ回転が、MHDモード(m/n=3/1、2/1)の成長を大幅に低減し、モードの重なりとそれに続く磁力線のエルゴード化を防止することにより、ディスラプションの回避をもたらす。

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