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

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...

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Veröffentlicht in:Physical review letters 2017-11, Vol.119 (20), p.205001-205001, Article 205001
Hauptverfasser: 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: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.119.205001