Effect of resonant magnetic perturbations on COMPASS-C tokamak discharges
- 1 December 1992
- journal article
- Published by IOP Publishing in Nuclear Fusion
- Vol. 32 (12), 2091-2117
- https://doi.org/10.1088/0029-5515/32/12/i02
Abstract
Experimental results from the COMPASS-C tokamak reveal a sharp threshold in amplitude above which externally applied static resonant magnetic perturbations (RMPs) induce stationary magnetic islands. Such islands (in particular, m=2, n=1 islands) give rise to a significant degradation in energy and particle confinement, suppression of the sawtooth oscillation and a large change in the impurity ion toroidal velocity. The observed threshold for inducing stationary (2,1) islands is consistent with a phenomenological resistive MHD model which takes into account plasma rotation (including poloidal flow damping) and externally applied resonant fields. Broadly similar results are found for applied fields other than m=2, n=1. Other results from RMP experiments are also discussed, such as the stabilization of rotating MHD activity, stimulated disruptions and extensions to the disruptive density limit. Finally, the likely effect of field errors on large tokamaks is briefly examined in the light of the COMPASS-C resultsKeywords
This publication has 25 references indexed in Scilit:
- Driven magnetic reconnection in the COMPASS-C tokamakPhysics of Fluids B: Plasma Physics, 1992
- A method to measure poloidal field coil irregularities in toroidal plasma devicesReview of Scientific Instruments, 1991
- Neoclassical poloidal and toroidal rotation in tokamaksPhysics of Fluids B: Plasma Physics, 1991
- Major disruptions induced by helical coils on the Tokoloshe tokamakNuclear Fusion, 1991
- Mode locking in tokamaksNuclear Fusion, 1990
- Space Potential Distribution in the ISX-B TokamakPhysical Review Letters, 1986
- Measurements of plasma column rotation and potential in the TM-4 tokamakNuclear Fusion, 1985
- Toroidal plasma rotation in the PLT tokamak with neutral-beam injectionNuclear Fusion, 1981
- Measurements of plasma rotation in tokamak LT-3Nuclear Fusion, 1979
- Saturation of the tearing modePhysics of Fluids, 1977