Physics of Relaxation in Coaxial Helicity Injection

在1999财政年度，华盛顿大学与姬路工业大学合作研究了同轴螺旋注入（CHI）球形行程结构中电流驱动的可能机制。利用1998财政年度从姬路工业大学携带的1米，分辨率为0.09 a的离子多普勒光谱仪（IDS），在华盛顿大学的螺旋注入环- ii （hiti - ii）上进行了测量。IDS的数据已用于确定不同离子种类的温度和环向离子流动速度。结果表明：等离子体核心处离子温度为~ 100 ev(OV)，等离子体边缘处离子温度为~ 30 ev(CIII)，离子流速度为10 ~ 20 km/s。测量的轴向和环向流与高频（50 kHz） n=1模态相关。提出了一种电流驱动的发电机模型，其中分离矩阵上的电子被束缚在旋转的n=1模式上，并将其预测与实验结果进行了比较。

In 1999 fiscal year, a possible mechanism for current drive in spherical tours configurations with coaxial helicity injection (CHI) has been studied at the University of Washington in collaboration with Himeji Institute of Technology. Measurements using a 1m, resolution of 0.09 A, Ion Doppler Spectrometer (IDS), which was carried from Himeji Institute of Technology in 1998 fiscal year, have been made on the Helicity Injected Torus-II (HIT-II) at the University of Washington. The data from the IDS have been used to determine temperature for various ion species and toroidal ion flow velocities. Results showed that ion temperature is 〜100 ev(OV) in the plasma core and 〜30 eV(CIII) at the plasma edge and ion flow velocities are 10〜20 km/s. The measured axial and toroidal flows are correlated with a high frequency (50 kHz) n=1 mode. A dynamo model for current drive, where the electrons on the separatrix are tied to a rotating n=1 mode, is presented and its predictions compared with experimental results.