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A study on the effects of magnetohydrodynamic perturbations on nonthermal beam formation during the current decay phase of disruptions in the T-10 tokamak

P.V. Savrukhin, E.A. Shestakov2015年被引用 23Nuclear FusionIF 3出版社

Repetitive bursts of nonthermal (Eγ ∼ 15 − 150 keV) x-ray radiation are observed during the plasma current decay phase of the density limit disruptions in the T-10 tokamak. The repetition rate of the nonthermal bursts correlates with the current decay rate. Analysis indicates that the phenomena can be connected with the nonthermal electrons initiated during the abrupt growth of the magnetohydrodynamic (MHD) modes in the series of minor disruptions. Application of the electron cyclotron waves in the post energy quench plasma allows control of the bursting MHD modes and prevention of nonthermal beam formation. Phenomenological modelling indicates that prevention of the nonthermal beams can be connected with elimination of the electric fields induced during magnetic reconnection in the series of minor disruptions, and reduction of the 'equilibrium' longitudinal electric field during auxiliary plasma heating.

日本語訳

非熱的(Eγ ∼ 15–150 keV)X線放射のバーストが、T-10トカマクにおける密度限界ディスラプションのプラズマ電流減衰位相中に観測される。非熱的バーストの繰り返し率は、電流減衰率と相関する。解析により、これらの現象は、一連の小ディスラプションにおけるMHDモードの急激な成長中に生成される非熱的電子と関連づけられることが示される。クエンチ後のプラズマへの電子サイクロトロン波の適用により、バースト性MHDモードの制御と非熱的電子ビーム形成の抑制が可能となる。現象論的モデリングは、非熱的ビームの抑制が、一連の小ディスラプションにおける磁気リコネクション中に誘起される電場の除去と、補助プラズマ加熱中の「平衡」縦電場の低減とに関連づけられることを示している。

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MagnetohydrodynamicsPlasma disruption
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