S. M. Wolfe I. H. Hutchinson R. S. Granetz J. Rice A. Hubbard A. Lynn P. Phillips T. C. Hender D. F. Howell R. J. La Haye J. T. Scoville
A set of external coils (A-coils) capable of producing nonaxisymmetric, predominantly n =1, fields with different toroidal phase and a range of poloidal mode m spectra has been used to determine the threshold amplitude for mode locking over a range of plasma parameters in Alcator C-Mod [I. H. Hutchinson, R. Boivin, F. Bombarda, P. Bonoli, S. Fairfa…
PublishedR. J. La Haye R. J. Buttery S. Guenter G. T. A. Huysmans M. Maraschek et al.
The islands from tearing modes driven unstable and sustained by the helically perturbed neoclassical bootstrap current often provide the practical limit to long-pulse, high confinement tokamak operation. The destabilization of such ‘‘metastable’’ plasmas depends on a ‘‘seed’’ island exceeding a threshold. A database from similar reg…
PublishedO. Sauter R. J. La Haye Z. Chang D. A. Gates Y. Kamada et al.
The maximum normalized beta achieved in long-pulse tokamak discharges at low collisionality falls significantly below both that observed in short pulse discharges and that predicted by the ideal MHD theory. Recent long-pulse experiments, in particular those simulating the International Thermonuclear Experimental Reactor (ITER) [M. Rosenbluth et al.…
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