CT-6B托卡马克等离子体角向转动的光谱测量

SPECTROSCOPIC MEASUREMENT OF PLASMA POLOIDAL ROTATION ON THE CT 6B TOKAMAK

利用高分辨光谱测量系统，根据杂质离子谱线ＯⅡ４６４２ｎｍ，ＣⅢ４６４７ｎｍ和氢Ｈα谱线的多普勒位移，测量了ＣＴ６Ｂ托卡马克等离子体角向转动速度的径向分布．结果表明：杂质离子的角向转动速度的方向在等离子体内部为电子逆磁漂移方向，其线速度在小半径约９ｃｍ处达到极大值３５ｋｍ／ｓ；在接近孔阑ｒ＝１０ｃｍ处，反转为离子逆磁漂移方向．由此导出等离子体内部的径向电场向里，其最大值为１８Ｖ／ｃｍ．中性氢原子只存在其方向为电子逆磁漂移方向的角向转动分量，其数值较杂质离子谱线所得结果要低．

Abstract By means of a high resolution spectroscopic detection system, the radial profiles of plasma poloidal rotation velocity have been measured from the Doppler shifts of impurity ion lines OⅡ464 2nm, CⅢ464 7nm and the hydrogen Hα line on the CT 6B Tokamak. The results show that inside the plasma, the poloidal rotation velocity of impurity ions is in the electron diamagnetic drift direction and reaches its maximum value of～3 5km/s at the minor radius around 9cm. It reverses to the ion diamagnetic drift direction with its maximum value at r= 10cm near the limiter. The internal electric field deduced from these data is directed towards the plasma center, and its maximum value is 18V/cm. There is also a poloidal rotation velocity component for neutral hydrogen but it is only in the electron diamagnetic drift direction with a value notably less than that of the ions. A preliminary discussion of the results is also given.