Fast Ion Effects on Fishbones and n=1 Kinks in JET Simulated by a Non-perturbative NOVA-KN Code

Gorelenkov, N.N. ; Cheng, C.Z. ; Kiptily, V.G. ; Mantsinen, M.J. ; Sharapov, S.E. ; Contributors, the JET-EFDA

Princeton University. Plasma Physics Laboratory.

关键词: Alpha Particles;    Precession;    Fishbone Instability;    70 Plasma Physics And Fusion Technology;    43 Particle Accelerators;   

DOI  :  10.2172/836153
RP-ID  :  PPPL-4021
RP-ID  :  AC02-76CH03073
RP-ID  :  836153

美国|英语

来源: UNT Digital Library

【 摘 要 】

New global non-perturbative hybrid code, NOVA-KN, and simulations of resonant type modes in JET [Joint European Torus] plasmas driven by energetic H-minority ions are presented. The NOVA-KN code employs the ideal-MHD description for the background plasma and treats non-perturbatively the fast particle kinetic response, which includes the fast ion finite orbit width (FOW) effect. In particular, the n = 1 fishbone mode, which is in precession drift resonance with fast ions, is studied. The NOVA-KN code is applied to model an n = 1 (f = 50-80kHz) MHD activity observed recently in JET low density plasma discharges with high fast ion (H-minority) energy content generated during the ion cyclotron resonance heating (ICRH). This n = 1 MHD activity is interpreted as the instability of the n = 1 precession drift frequency fishbone modes.