Propagation Dynamics Associated with Resonant Magnetic Perturbation Fields in High-Confinement Mode Plasmas inside the KSTAR Tokamak

• Published in: Physical review letters Vol. 119; no. 20; p. 205001
• Main Authors: Xiao, W W, Evans, T E, Tynan, G R, Yoon, S W, Jeon, Y M, Ko, W H, Nam, Y U, Oh, Y K
• Format: Journal Article
• Language: English
• Published: United States 15.11.2017
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.119.205001

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.