Abstract:

The infrared and visible image from synchrotron radiation emitted by the runaway electrons (Res) in EAST tokamak is observed by using the infrared (IR) camera and visible camera. The relation between the wavelength of the synchrotron radiation emitted by runaway electrons (RE) and the energy of the RE is studied. The result shows that the wavelength of the synchrotron radiation emitted by the RE with lower energy RE is in the infrared wavelength range. As the energy of RE increases, the wavelength of the synchrotron radiation emitted by the RE will shift to the side of short waves, which then could be detected by a visible camera. The RE behaviors under the influence of the hybrid waves (LHWs) and neutral beam injection (NBI) are also investigated. It is found that the fast electrons excited by LHWs can be accelerated to runaway electrons during the initial phase of the LHWs injection.

Key words: Runaway electrons, IR camera, Visible CCD, EAST tokamak

摘要：

通过红外可见内窥镜诊断系统对EAST 等离子体芯部逃逸电子的同步辐射功率谱进行了分析，得出低能段逃逸电子同步辐射主要在红外波段，随着逃逸电子能量的增加，同步辐射向短波方向移动进入可见光波段。在欧姆放电条件下，对逃逸电子同步辐射所产生的的红外可见光进行了成像分析，同时研究了EAST 等离子体在低杂波和中性束注入加热条件下的逃逸电子行为。实验结果显示，低杂波和NBI 的投入总体抑制电子的逃逸，但低杂波投入初期产生的快电子对逃逸电子的产生具有促进作用。

关键词: 逃逸电子, 红外相机, 可见CCD, EAST 装置