Abstract:

On the HT-7 tokamak, a high-speed CCD diagnostic system was set up, the visible radiation of boundary plasma was measured. During the experiments on the HT-7 tokamak, a poloidal rotating visible radiation belt in the plasma boundary region was observed for the first time, the frequency calculated by CCD system is 858Hz and the value is 952Hz by the calculation of multi-channel H_α array measurement. According to the multi-channel magnetic probe signals, there was a m/n=3/1 mode within the plasma and its frequency is 972Hz. The magnetic island width is about 2.5cm based on the Te profile measured by ECE system.

Key words: CCD diagnostics, HT-7 tokamak, Plasma rotation

摘要：

在HT-7装置上建立了一套高速CCD可见光成像诊断，测量了边界等离子体的可见光辐射成像。在HT-7装置放电中，首次观察到在等离子体边界区域存在一条极向旋转的可见光辐射带，由CCD诊断系统得到其极向旋转的频率为858Hz。根据多道H_α阵列测量得到极向旋转频率为952Hz。多道磁探针信号测量发现，等离子体内部存在m/n=3/1的电磁模，该模的旋转频率为972Hz。从电子回旋辐射诊断系统得到的电子温度剖面发现该模的磁岛宽度约为2.5cm。

关键词: CCD诊断, HT-7装置, 等离子体旋转