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Suppression of runaway current generation by supersonic molecular beam injection during disruptions on J-TEXT

D W Huang, Z Y Chen, R H Tong, W Yan, S Y Wang, Y N Wei, T K Ma, A J Dai, X L Wang, Z H Jiang2017年Plasma Physics and Controlled FusionIF 2.2出版社

The suppression of disruption-generated runaway electrons (REs) by supersonic molecular beam injection (SMBI) has been investigated on the J-TEXT tokamak. Experimental results demonstrate that the hydrogen injected by SMBI during plasma current flattop phase can provoke magnetic perturbations, which increase RE losses rapidly. The effective radial diffusion coefficient of REs due to SMBI is estimated as Dr ≈ 16 m2 s−1. Based on this benefit, the SMBI has been used to explore the suppression of disruption-generated REs. In J-TEXT, RE current is created with rapid argon injection by a massive gas injection valve. It is found that hydrogen SMBI before disruption efficiently suppresses the generation of RE current.

日本語訳

J-TEXTトカマクにおいて、超音速分子ビーム入射(SMBI)によるディスラプション生成逃走電子(RE)の抑制について調査した。実験結果は、プラズマ電流フラットトップ位相におけるSMBIによる水素入射が磁気擾乱を誘発し、REの損失を急速に増加させることを実証した。SMBIによるREの有効径方向拡散係数は、Dr ≈ 16 m2 s−1と推定された。この利点に基づき、SMBIを用いてディスラプション生成REの抑制を探求した。J-TEXTにおいて、RE電流は大規模ガス入射バルブによる急速アルゴン入射によって生成される。ディスラプション前の水素SMBIがRE電流の生成を効率的に抑制することが見出された。

wiki

Plasma disruptionNeutral beam injectionTEXTJ-TEXTMolecular beamSupersonic molecular beam injection
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