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ELM mitigation by supersonic molecular beam injection into the H-mode pedestal in the HL-2A tokamak

W.W. Xiao, P.H. Diamond, X.L. Zou, J.Q. Dong, X.T. Ding, L.H. Yao, B.B. Feng, C.Y. Chen, W.L. Zhong, M. Xu2012年被引用 82Nuclear FusionIF 3出版社

Density profiles in the pedestal region (H-mode) are measured in HL-2A and the characteristics of the density pedestal are described. Cold particle deposition by supersonic molecular beam injection (SMBI) within the pedestal is verified. Edge-localized mode (ELM) mitigation by SMBI into the H-mode pedestal is demonstrated and the relevant physics is elucidated. The sensitivity of the effect to SMBI pressure and duration is studied. Following SMBI, the ELM frequency increases and the ELM amplitude decreases for a finite duration. Increases in ELM frequency of are achieved. This experiment argues that the ELM mitigation results from an increase in higher frequency fluctuations and transport events in the pedestal, which are caused by SMBI. These inhibit the occurrence of large transport events which span the entire pedestal width. The observed change in the density pedestal profiles and edge particle flux spectrum with and without SMBI supports this interpretation. An analysis of the experiment and a model shows that ELMs can be mitigated by SMBI with shallow particle penetration into the pedestal.

日本語訳

ペデスタル領域(Hモード)における密度プロファイルをHL-2Aで測定し、密度ペデスタルの特性を記述する。ペデスタル内への超音速分子ビーム入射(SMBI)による冷たい粒子堆積を検証する。HモードペデスタルへのSMBIによる周辺局在モード(ELM)緩和を実証し、関連する物理を解明する。SMBI圧力と持続時間に対する効果の感度を研究する。SMBIの後、ELM周波数は増加し、ELM振幅は有限の期間減少する。ELM周波数の増加が達成される。この実験は、ELM緩和が、SMBIによって引き起こされるペデスタル内の高周波ゆらぎと輸送事象の増加に起因することを論じる。これらは、ペデスタル全体の幅に及ぶ大きな輸送事象の発生を阻害する。SMBIの有無による密度ペデスタルプロファイルと端部粒子束スペクトルの観測された変化は、この解釈を支持する。実験の解析とモデルは、ELMがペデスタルへの浅い粒子侵入を伴うSMBIによって緩和され得ることを示す。

wiki

Edge localized modeH-modeNeutral beam injectionPedestalHL-2AH-mode pedestalMolecular beamSupersonic molecular beam injection
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