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(EX/P3-21) Heating and Active Control of Profiles and Transport by IBW in the HT-7 Toakamak

Yanping Zhao¹⁾, Yanping Zhao¹⁾, Baonian Wan¹⁾, Jiangang Li¹⁾, Jiarong Luo¹⁾, Junyu Zhao¹⁾, Yuezhou Mao¹⁾, T. Watari²⁾, T. Mutoh²⁾, Haiqing Liu¹⁾, Yinxian Jie¹⁾, Liquan Hu¹⁾, Yuechun Xu¹⁾, Jinping Qing¹⁾, R. Kumazawa²⁾, T. Seki²⁾, HT-7 Team^1)
 
1) Institue of Plasma Physics, Chinese Academy of Sciences, Hefei, China
²⁾ 2) National Institute for Fusion Science, Toki, Gifu 509-5292, Japan

Abstract.   Significant progress on Ion Bernstein Wave (IBW) heating and control of profiles has been obtained in HT-7. Both on-axis and off-axis electron heating with global peaked and local steep electron pressure profiles were realized if the position of the resonant layer was selected to be plasma far from the plasma edge region. Reduction of electron heat transport has been observed from sawtooth heat pulse propagation. Improvement of both particle and energy confinement was slight in the on-axis and considerable in the off-axis heating cases. The improved confinement in off-axis heating mode may be due to the extension of the high performance plasma volume caused by IBW. These studies demonstrate that IBWs are potentially a tool for active control of plasma profiles and transport.

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