Abstract During the current flat-top phase of electron cyclotron resonance heating discharges in the HL-2A Tokamak, the behaviour of runaway electrons has been studied by means of hard x-ray detectors and neutron diagnostics. During electron cyclotron resonance heating, it can be found that both hard x-ray radiation intensity and neutron emission flux fall rapidly to a very low level, which suggests that runaway electrons have been suppressed by electron cyclotron resonance heating. From the set of discharges studied in the present experiments, it has also been observed that the efficiency of runaway suppression by electron cyclotron resonance heating was apparently affected by two factors: electron cyclotron resonance heating power and duration. These results have been analysed by using a test particle model. The decrease of the toroidal electric field due to electron cyclotron resonance heating results in a rapid fall in the runaway electron energy that may lead to a suppression of runaway electrons. During electron cyclotron resonance heating with different powers and durations, the runaway electrons will experience different slowing down processes. These different decay processes are the major cause for influencing the efficiency of runaway suppression. This result is related to the safe operation of the Tokamak and may bring an effective control of runaway electrons.
Received: 01 April 2009
Revised: 05 May 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10675124, 10775041
and 10775045).
Cite this article:
Zhang Yi-Po(张轶泼),Yang Jin-Wei(杨进蔚),Liu Yi(刘仪), Song Xian-Ying(宋先瑛),Yuan Guo-Liang(袁国梁),Li Xu(李旭), Zhou Yan(周艳), Zhou Jun(周俊),Yang Qing-Wei(杨青巍), Chen Liao-Yuan(陈燎原),Rao Jun(饶军),Duan Xu-Ru(段旭如), Pan Chuan-Hong(潘传红), and HL-2A Team Study of runaway electron behaviour during electron cyclotron resonance heating in the HL-2A Tokamak 2009 Chin. Phys. B 18 5385
AC operation and runaway electron behaviour in HT-7 tokamak Lu Hong-Wei(卢洪伟), Hu Li-Qun(胡立群), Zhou Rui-Jie(周瑞杰), Lin Shi-Yao(林士耀), Zhong Guo-Qiang(钟国强), Wang Shao-Feng(王少锋), Chen Kai-Yun(陈开云), Xu Ping(许平), Zhang Ji-Zong(张继宗) Ling Bi-Li(凌必利), Mao Song-Tao(毛松涛), Duan Yan-Min(段艳敏), and HT-7 Team. Chin. Phys. B, 2010, 19(6): 065201.
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