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Observation of thermal quench induced by runaway electrons in magnetic perturbation

MunSeong Cheon, Dongcheol Seo, Junghee Kim2018年被引用 4Nuclear FusionIF 3出版社

Experimental observations in Korea Superconducting Tokamak Advanced Research (KSTAR) plasmas show that a loss of pre-disruptive runaway electrons can induce a rapid radiative cooling of the plasma, by generating impurity clouds from the first wall. The synchrotron radiation image shows that the loss of runaway electrons occurs from the edge region when the resonant magnetic perturbation is applied on the plasma. When the impact of the runaway electrons on the wall is strong enough, a sudden drop of the electron cyclotron emission (ECE) signal occurs with the characteristic plasma behaviors such as the positive spike and following decay of the plasma current, Dα spike, big magnetic fluctuation, etc. The visible images at this runaway loss show an evidence of the generation of impurity cloud and the following radiative cooling. When the runaway beam is located on the plasma edge, thermal quenches are expected to occur without global destruction of the magnetic structure up to the core.

日本語訳

Korea Superconducting Tokamak Advanced Research(KSTAR)プラズマにおける実験的観測により、破壊前の逃走電子の損失が、第一壁からの不純物雲の生成を通じてプラズマの急速な放射冷却を誘起し得ることが示されている。シンクロトロン放射画像は、共鳴磁気摂動がプラズマに印加された際に、逃走電子の損失が端部領域から生じることを示している。逃走電子の壁への衝突が十分に強い場合、電子サイクロトロン放射(ECE)信号の急激な低下が、プラズマ電流の正スパイクとそれに続く減衰、Dαスパイク、大きな磁気揺動などの特徴的なプラズマ挙動を伴って発生する。この逃走電子損失時の可視画像は、不純物の生成とそれに続く放射冷却の証拠を示している。逃走ビームがプラズマ端部に位置する場合、コアまでの磁気構造の全体的な破壊を伴わずに熱クエンチが発生することが予想される。

装置

kstar中精度(概要文一致)

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Magnetic perturbationRunaway electron
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