AC operation and runaway electron behaviour in HT-7 tokamak |
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Authors: | Lu Hong-Wei Hu Li-Qun Zhou Rui-Jie Lin Shi-Yao Zhong Guo-Qiang Wang Shao-Feng Chen Kai-Yun Xu Ping ZhangJi-Zong Ling Bi-Li Mao Song-Tao and DuanYan-Min |
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Institution: | Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230030, China |
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Abstract: | Operation of HT-7 tokamak in a multicycle alternating
square wave plasma current regime is reported. A set of AC operation
experiments, including LHW heating to enhance plasma ionization
during the current transition and current sustainment, is described.
The behaviour of runaway electrons is analysed by four HXR detectors
tangentially viewing the plasma in the equatorial plane, within
energy ranges 0.3--1.2~MeV and 0.3--7~MeV, separately. High energy
runaway electrons ($\sim $MeV) are found to circulate predominantly
in the opposite direction to the plasma current, while the number of
low energy runaway electrons ($\sim $tens to hundreds of keV)
circulating along the plasma current is comparable to that in the
direction opposite to the plasma current. AC operation with lower
hybrid current drive (LHCD) is observed to have an additional
benefit of suppressing the runaway electrons if the drop of the loop
voltage is large enough. |
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Keywords: | runaway electron alternating current (AC) discharge lower hybrid current drive loop voltage |
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