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VOLUME 31 (1980) | ISSUE 12 | PAGE 756
On the nature of disruptive instability in a tokamak
The role of the interaction of plasma current with a longitudinal field in the helical instabilities is determined. It is shown that the buildup saturation of the helical modes is due only to the surface currents. A mechanism for the disruptive instability, based on the assumption that these surface currents can be effectively dissipated due to, for example, a surface helical mode which was detected elsewhere,5 is proposed.