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Findings of pre-ELM structures through the observation of divertor heat load patterns at JET with applied n = 2 perturbation fields

M. Rack, B. Sieglin, T. Eich, J. Pearson, Y. Liang, I. Balboa, S. Jachmich, A. Wingen, S.J.P. Pamela, JET EFDA Contributors2014年被引用 4Nuclear FusionIF 3出版社

Resonant magnetic perturbation experiments at JET with the ITER-like wall have shown the formation of radially propagating pre-ELM structures in the heat flux profile on the outer divertor. These appear a few milliseconds before the major divertor heat load, caused by type-I edge-localized modes (ELMs). The formation of the pre-ELM structures is accompanied by an increase in the Dα emission. For some pronounced examples, the propagation appears to end at the positions where an increased heat load is seen during the ELM crash a few milliseconds later. These observations are presented and discussed along with a comparison of a thermoelectric edge currents model.

日本語訳

JETにおけるITER類似壁を用いた共鳴磁場摂動実験では、外部ダイバータ上の熱流束プロファイルにおいて、径方向に伝播するELM前構造の形成が観測された。これらの構造は、I型ELM(エッジ局在モード)によって引き起こされる主要なダイバータ熱負荷の数ミリ秒前に現れる。ELM前構造の形成には、Dα発光の増加が伴う。いくつかの顕著な例では、その伝播は、数ミリ秒後のELMクラッシュ時に熱負荷の増加が観測される位置で終端するように見える。これらの観測結果を提示し、熱電対エッジ電流モデルとの比較とともに考察する。

装置

jet高精度(タイトル一致)iter中精度(概要文一致)

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JETDivertorEdge localized modeHeat load
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