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(EX/P3-20) Investigation on Synergy of IBW and LHCD for Integrated High Performance Operation in HT-7 Tokamak

Baonian Wan¹⁾, Baonian Wan¹⁾, Yuejiang Shi¹⁾, Yanping Zhao¹⁾, Jiafang Shan¹⁾, Junyu Zhao¹⁾, Yubao Zhu¹⁾, Yinxian Jie¹⁾, Guosheng Xu¹⁾, Mei Song¹⁾, Jiangang Li¹⁾, Fukun Liu¹⁾, Bojiang Ding¹⁾, Guangli Kuang¹⁾, Haiqing Liu^1)
 
1) Institue of Plasma Physics, Chinese Academy of Sciences, Hefei, China

Abstract.  Control of the current density profile has been realized with off-axis current drive by the LHW and its synergetic effect with the IBW in the HT-7 tokamak. The IBW is explored as a means of improving current drive efficiency, creating a well-localized fast electron current channel and extending the high performance volume in LHCD plasmas. High performance via formation of an ITB-like profile in electron temperature, which was strongly correlated with the location of the LHW driven fast electron current, was achieved in the IBW and LHCD synergetic discharges through moving the IBW resonant layer to maximize the plasma performance and to avoid MHD activity. A variety of high performance discharges, indicated by betaN*H89 = 1-4, was produced for several tens of energy confinement times. This operation mode utilizing the synergetic effect of IBW and LHCD provides a new way to obtain steady-state operation in an advanced tokamak scenario.

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