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Self-consistent analysis of the power-energy balance and determination of the runaway electron characteristics in the ISTTOK discharges

V V Plyusnin, J A C Cabral, H Figueiredo, I S Nedzelskii, C A F Varandas2002年Plasma Physics and Controlled FusionIF 2.2出版社

Low plasma density discharges at high longitudinal electric fields (E0⩾1 V m-1) in the ISTTOK tokamak revealed characteristic features for the runaway (RA) generation process. The increase in soft x-ray emission was detected at the onset of the RA regime. The relaxations of the plasma parameters, a typical satellite effect of the instability driven by the RA electrons, were observed in experiments. In some discharges instability caused minor disruptions. Simultaneous determination of the RA electron characteristics and reconstruction of the electron temperature temporal evolution has been performed using self-consistent 0-D calculations of the plasma transport on the basis of the measured plasma parameters with the inclusion of the RA generation process. The kinetic energy as well as the confinement time of RA electrons was evaluated. The modelling procedure developed was applied in the investigation of a possible RA generation process at the thermal quench in large-scale tokamak disruption.

日本語訳

高縦電場(E0⩾1 V m-1)におけるISTTOKトカマクの低プラズマ密度放電は、逃走電子(RA)生成過程の特徴的な挙動を明らかにした。RA領域の開始時には、軟X線放射の増加が検出された。実験では、RA電子によって駆動される不安定性の典型的な副次的効果であるプラズマパラメータの緩和が観測された。一部の放電では、不安定性が軽微なディスラプションを引き起こした。測定されたプラズマパラメータに基づき、RA生成過程を組み込んだ自己無撞着な0次元プラズマ輸送計算を用いて、RA電子特性の同時決定と電子温度の時間発展の再構成が実施された。RA電子の運動エネルギーおよび閉じ込め時間が評価された。開発されたモデリング手法は、大規模トカマクのディスラプションにおける熱クエンチ時のRA生成過程の調査に適用された。

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