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JET radiative mantle experiments in ELMy H-Mode

J D Strachan, R Budny, I Coffey, P Dumortier, C Grisolia, P Harbour, M von Hellermann, D Hillis, T Hoang, J Hogan2000年Plasma Physics and Controlled FusionIF 2.2出版社

Radiative mantle experiments were performed on JET ELMy H-modeplasmas. The septum configuration was used where the X-point isembedded into the top of the septum. Argon radiated 50% of theinput power from the bulk plasma while Zeff rose from anintrinsic level of 1.5 to about 1.7 due to the injected argon.The total energy content and global energy confinement timedecreased 15% when the impurities were introduced. In contrast,the effective thermal diffusivity in the core confinementregion (r/a = 0.4-0.8) decreased by 30%. Usually, JET ELMyH-mode plasmas have confinement that is correlated to the edgepedestal pressure. The radiation lowered the edge pedestal andconsequently lowered the global confinement. Thus the globalconfinement was changed by a competition between the edgepedestal reduction lowering the confinement and the weaker RIeffect reducing the core transport coefficients. The ELMfrequency increased from 10 Hz type-I ELMs, to 200 Hz type-IIIELMs. The energy lost by each ELM reduced to 0.5% of the plasmaenergy content.

日本語訳

JETのELMy Hモードプラズマにおいて、放射マントル実験を実施した。X点がセプタムの上部に埋め込まれたセプタム配位を用いた。アルゴンはバルクプラズマから入射パワーの50%を放射し、その間Zeffはアルゴン注入により固有値1.5から約1.7へ上昇した。不純物導入時、全エネルギーと全球閉じ込め時間は15%減少した。対照的に、コア閉じ込め領域(r/a = 0.4-0.8)における有効熱拡散係数は30%減少した。通常、JETのELMy Hモードプラズマは、エッジペデスタル圧力と相関した閉じ込めを示す。放射はエッジペデスタルを低下させ、その結果として全球閉じ込めを低下させた。したがって、全球閉じ込めは、閉じ込めを低下させるエッジペデスタルの減少と、コア輸送係数を低減するより弱いRI効果との間の競合によって決定された。ELM周波数は、タイプI ELMの10 HzからタイプIII ELMの200 Hzへ増加した。各ELMによるエネルギー損失は、プラズマエネルギーの0.5%に減少した。

装置

jet高精度(タイトル一致)

wiki

JETEdge localized modeH-modeELMy H-mode
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