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Elevation of runaway electron current by electron cyclotron resonance heating during disruptions on J-TEXT

W Bai, W Yan, Z Y Chen, Y N Wei, R H Tong, Z F Lin, Y Li, J G Fang, X B Zhang, L K Mou2021年Plasma Physics and Controlled FusionIF 2.2出版社

Runaway electrons represent a serious problem for the reliable operation of future tokamaks. Radio frequency (RF) auxiliary heating can help suppress runaway electrons in the flat-top phase through a reduction in loop voltage. However, if a disruption occurs during RF auxiliary heating, it may lead to an increase in the runaway electron production due to the generation of a suprathermal population with energies in the order of ∼100 keV. The elevation of runaway current during disruptions by electron cyclotron resonance heating (ECRH) has been investigated on the J-TEXT tokamak. The results show that the conversion efficiency of runaway current increases with increased ECRH power. When the applied ECRH power is at the level of 400 kW, the conversion efficiency of Ohmic to runaway current increases from 35% to 75%, the thermal quench duration is decreased from 0.24 ms to 0.11 ms, and the Absolute Extreme Ultraviolet Spectrometer (AXUV) radiative power and electron density are about two times higher than the cases without ECRH heating.

日本語訳

逃走電子は、将来のトカマク装置の信頼性にとって深刻な問題である。高周波(RF)補助加熱は、ループ電圧の低減を通じてフラットトップ位相における逃走電子を抑制することができる。しかし、RF補助加熱中にディスラプションが発生した場合、約100 keVのエネルギーを持つ超熱粒子集団の生成により、逃走電子の生成が増加する可能性がある。J-TEXTトカマクにおいて、電子サイクロトロン共鳴加熱(ECRH)によるディスラプション中の逃走電流の増加が調査された。結果は、ECRHパワーの増加に伴い、逃走電流への変換効率が増加することを示している。印加ECRHパワーが400 kWのレベルにある場合、オーミックから逃走電流への変換効率は35%から75%へ増加し、熱クエンチ持続時間は0.24 msから0.11 msへ短縮され、絶対極端紫外分光計(AXUV)による放射パワーと電子密度は、ECRH加熱がない場合と比較して約2倍に増加する。

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Plasma disruptionElectron cyclotron heatingCyclotron resonanceRunaway electronElectron cyclotron resonanceTEXTJ-TEXT
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