DISRUPTIONS IN TOKAMAKS
This paper discusses major and minor disruptions in tokamaks. A number of models and numerical simulations of disruptions based on resistive MHD are reviewed. A discussion is given of how disruptive current profiles are correlated with the experimentally known operational limits in density and current. It is argued that the q"rm a"=2 limit is connected with stabilization of the m=2/n=1 tearing mode for 2<q"rm a" le 2.7 by resistive walls and mode rotation. Experimental and theoretical observations indicate that major disruptions usually occur in at least two phases, first a predisruption, or loss of confinement in the region 1<q<2, leaving the q simeq 1 region almost unaffected, followed by a final disruption of the central part, interpreted here as a toroidal n = 1 external kink mode.
Bibliographic Reference: WORKSHOP ON THEORY OF FUSION PLASMAS, VARENNA/I, AUG. 24-28, AVAILABILITY: CEC-LUXEMBOURG, DG XIII/A2, BP 1907, MENTIONING PAPER ORA 33780 E
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Record Number: 1989126071600 / Last updated on: 1989-05-01
Available languages: en