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Effects of negative and positive bias voltages on turbulence characteristics in J-TEXT tokamak

Bo Zhang, Hai Liu, Yuhong Xu, Zhipeng Chen, Jun Cheng, Haifeng Liu, Xianqu Wang, Jie Huang, Xin Zhang, Changjian Tang2023年Plasma Physics and Controlled FusionIF 2.2出版社

The effects of positive and negative bias voltages on the turbulence characteristics in the edge plasmas of J-TEXT are studied using Langmuir probe arrays. The experimental results illustrate that the turbulent particle transport fluxes are suppressed in both positive and negative bias cases, while the suppression mechanisms are quite different. For positive bias (+300 V), long-range correlation (LRC) structures with frequencies of about 10–30 kHz are generated, which are beneficial for turbulent transport suppression. In the −300 V bias case, no LRCs appear, while a strong mean flow shear exists which can reduce the amplitudes of potential and density fluctuations and thus decrease the turbulent transport.

日本語訳

J-TEXTのエッジプラズマにおける乱流特性に対する正および負のバイアス電圧の影響を、ラングミュアプローブアレイを用いて研究した。実験結果は、正および負の両方のバイアス場合において乱流粒子輸送フラックスが抑制されることを示しているが、その抑制メカニズムはかなり異なる。正バイアス(+300 V)の場合、約10〜30 kHzの周波数を持つ長距離相関(LRC)構造が生成され、これが乱流輸送の抑制に寄与する。負バイアス(-300 V)の場合、LRCは現れないが、強い平均流シアが存在し、これが電位および密度の変動振幅を低減させ、それによって乱流輸送を減少させることができる。

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