Study of runaway electron behaviour during electron cyclotron resonance heating in the HL-2A Tokamak
Study of runaway electron behaviour during electron cyclotron resonance heating in the HL-2A Tokamak
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DOI：
10.1088/1674-1056/18/12/044
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发表时间：
2009-12
影响因子：
1.7
通讯作者：
Yipo Zhang;Jinwei Yang;Yi Liu;Xianying Song;G. Yuan;Xu Li;Yan Zhou;Jun Zhou;Qingwei Yang-Qingwei-Ya
中科院分区：
文献类型：
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作者：
Yipo Zhang;Jinwei Yang;Yi Liu;Xianying Song;G. Yuan;Xu Li;Yan Zhou;Jun Zhou;Qingwei Yang-Qingwei-Ya
在HL-2A装置电子回旋共振加热放电的平顶阶段，用硬X射线探测器和中子诊断法研究了逃逸电子的行为。在电子回旋共振加热过程中，可以发现硬X射线辐射强度和中子发射通量都迅速下降到很低的水平，这表明逃逸电子已被电子回旋共振加热抑制。从本实验中研究的一组放电，它也被观察到，失控抑制的效率由电子回旋共振加热明显地受到两个因素的影响：电子回旋共振加热功率和持续时间。这些结果已通过使用测试粒子模型进行了分析。由于电子回旋共振加热而导致的环形电场的减小导致失控电子能量的快速下降，这可能导致失控电子的抑制。在不同功率和持续时间的电子回旋共振加热过程中，逃逸电子将经历不同的慢化过程。这些不同的衰减过程是影响失控抑制效率的主要原因。这一结果关系到托卡马克的安全运行，并可能带来对逃逸电子的有效控制。
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.