Asymmetric magnetic flux generation, m=1 activity, and edge phenomena on a reversed-field pinch
- 1 June 1987
- journal article
- Published by AIP Publishing in Physics of Fluids
- Vol. 30 (6) , 1828-1838
- https://doi.org/10.1063/1.866198
Abstract
The ZT‐40M [Fusion Tech. 8, 1571 (1985)] reversed‐field pinch has been used to study magnetic flux perturbations during high‐θ [θ=Bθ(a)/〈Bφ〉>1.6] discharges. Asymmetric toroidal magnetic flux perturbations are found to be associated with magnetic flux emerging through the toroidal shell gap and with m=0 magnetic disturbances moving toroidally. Ramping current discharges, which are a special case of high‐θ operation, show the most robust self‐generation of toroidal flux. The electron density fluctuations on the inside major radius and associated m=1 and m=0 fluctuations seen on edge magnetic field probes provide a clearer picture of activity during a soft x‐ray sawtooth crash. During the sawtooth crash, significant magnetic energy is apparently converted into kinetic energy of the particles.Keywords
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