Physics of Relaxation in Coaxial Helicity Injection

在1999财政年度，华盛顿大学与Himeji理工学院合作，研究了具有同轴螺旋度注入(CHI)的球面巡视配置中电流驱动的可能机制。用1米、分辨率0.09A的离子多普勒谱仪(IDS)在华盛顿大学的螺旋注入环-II(HIT-II)上进行了测量，该仪器于1998财政年度从Himeji理工学院获得。来自入侵检测系统的数据已被用来确定各种离子物种的温度和环状离子流动速度。结果表明，等离子体核心的离子温度为~100 eV(OV)，等离子体边缘的离子温度为~30 eV(CIII)，离子流速度为10~20公里/S，测得的轴向和环向流动与高频(50 KHz)n=1模相关。提出了电流驱动的发电机模型，其中分界线上的电子与旋转的n=1模联系在一起，并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.