Modeling of ICRH H-minority Driven n = 1 Resonant Modes in JET
Authors: N.N. Gorelenkov, M.J. Mantsinen, S.E. Sharapov, C.Z. Cheng, and the JET-EFDA Contributors
Date of PPPL Report: August 2003
Presented at: the Thirtieth European Physical Society Conference on Controlled Fusion and Plasma Physics, 7-11 July 2003, St. Petersburg, Russia Federation, Russia.
A nonperturbative code NOVA-KN (Kinetic Nonperturbative) has been developed to account for finite orbit width (FOW) effects in nonperturbative resonant modes such as the low-frequency MHD modes observed in the Joint European Torus (JET). The NOVA-KN code was used to show that the resonant modes with frequencies in the observed frequency range are ones having the characteristic toroidal precession frequency of H-minority ions. Results are similar to previous theoretical studies of fishbone instabilities, which were found to exist at characteristic precession frequencies of hot ions.