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Intermittent convective transport suppressed by supersonic molecular beam injection on the HL-2A tokamak

L Nie, J Cheng, Y Huang, L W Yan, L H Yao, B B Feng, J Q Dong, M Xu, K J Zhao, D L Yu2014年Plasma Physics and Controlled FusionIF 2.2出版社

Edge localized mode (ELM)-filament statistical characteristics and intermittent convective transport are studied during ELM mitigation (10–30 ms) induced by supersonic molecular beam injection (SMBI) on the HL-2A tokamak. Langmuir probe data show that the burst rate of large amplitude filaments (δne > 4σ) decreases by 30–50% and their radial velocity decreases by 40–60%, which is an indication of an amplitude reduction. A decrease of long-range correlation along the magnetic flux surface is observed after SMBI, indicating a role of electron–ion collisionality on the filament parallel current in the ELM mitigation time. The transient particle and heat fluxes decrease about 40–50% and 50–60%, respectively. These observations indicate that SMBI might be an effective method to suppress the intermittent convective transport.

日本語訳

ELMフィラメントの統計的特性と間欠的对流輸送は、HL-2Aトカマクにおける超音速分子ビーム入射(SMBI)によって誘起されたELM緩和(10–30 ms)中に研究された。ラングミュアプローブデータは、大振幅フィラメント(δne > 4σ)のバースト率が30–50%減少し、その径方向速度が40–60%減少することを示しており、これは振幅の減少を示唆している。磁気面に沿った長距離相関の減少がSMBI後に観測され、ELM緩和時間におけるフィラメントの平行電流に対する電子-イオン衝突率の役割を示している。間欠的粒子および熱流束は、それぞれ約40–50%および50–60%減少する。これらの観測結果は、SMBIが間欠的对流輸送を抑制する有効な方法である可能性を示している。

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Neutral beam injectionHL-2AMolecular beamSupersonic molecular beam injection
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