Abstract
Triggered vertical shifts of the MAST spherical tokamak plasma have been found to stabilize 2/1 neoclassical tearing modes (NTMs) for a number of MAST shots, without impacting on core confinement. This stabilization is a result of favourable modifications of the density, temperature and pressure profiles at the location of an NTM by means of a brief transition from high (H) to low (L) confinement mode. Using this method, the high confinement phase can typically be recovered, and the NTM removed, within 20 ms of onset.
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