Xiao W W, Evans T E, Tynan G R, Yoon S W, Jeon Y M, Ko W H, Nam Y U, Oh Y K
Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China.
General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.
Phys Rev Lett. 2017 Nov 17;119(20):205001. doi: 10.1103/PhysRevLett.119.205001. Epub 2017 Nov 15.
The propagation dynamics of resonant magnetic perturbation fields in KSTAR H-mode plasmas with injection of small edge perturbations produced by a supersonic molecular beam injection is reported for the first time. The results show that the perturbation field first excites a plasma response on the q=3 magnetic surface and then propagates inward to the q=2 surface with a radially averaged propagation velocity of resonant magnetic perturbations field equal to 32.5 m/ s. As a result, the perturbation field brakes the toroidal rotation on the q=3 surface first causing a momentum transport perturbation that propagates both inward and outward. A higher density fluctuation level is observed. The propagation velocity of the resonant magnetic perturbations field is larger than the radial propagation velocity of the perturbation in the toroidal rotation.
首次报道了在韩国超导托卡马克先进研究装置（KSTAR）H模等离子体中，通过超声分子束注入产生小边缘扰动时，共振磁扰场的传播动力学。结果表明，扰动场首先在q=3磁面上激发等离子体响应，然后以共振磁扰场的径向平均传播速度32.5 m/s向内传播到q=2面。结果，扰动场首先在q=3面上制动环向旋转，引起向内和向外传播的动量传输扰动。观察到更高的密度涨落水平。共振磁扰场的传播速度大于扰动在环向旋转中的径向传播速度。
