Physics – Plasma Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dppbi1004c&link_type=abstract
American Physical Society, 45th Annual Meeting of the Division of Plasma Physics, October 27-31, 2003, Albuquerque, New Mexico,
Physics
Plasma Physics
Scientific paper
A comprehensive theoretical model for the feedback stabilization of the resistive wall mode (RWM) in a rotating plasma is needed in order to facilitate the interpretation of present day experiments and to reliably predict the performance of future tokamaks. Long-term stability of tokamaks with beta above the no wall stability limit relies on stabilization against the RWM. It has been demonstrated in DIII-D that plasma rotation together with the intrinsic dissipation of the RWM perturbation can stabilize the mode. However, uncertainty in the minimum rotation speed projected to future tokamaks can impose severe demands on the auxiliary systems. Therefore, combining plasma rotation with magnetic feedback remains the most promising approach. Modeling of this process requires knowing the plasma response to the external perturbations from the feedback system in a non-ideal rotating plasma, including the rotation frequency and phase shift in the non-resonant plasma response and the dynamics of the resonant response. Above the beta stability threshold, the unstable RWM appears as an intrinsic plasma response with a real rotation frequency. For beta below marginal stability, the plasma responds with a phase and amplitude related to the intrinsic damping and mode rotation rate. Success in feedback depends critically on the ability to model these frequency and phase responses accurately. The MARS MHD code has been modified to study the response of a rotating plasma in this frequency regime. Comparsion between the MARS modeling of the plasma response and DIII-D experimental measurements can validate the dissipation process. This response is then coupled with realistic behavior of the feedback system to evaluate the feasibility of feedback stabilization of a rotating tokamak.
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