STOCHASTICITY AS THE MECHANISM FOR THE DISRUPTION PHASE OF M=1 TOKAMAK OSCILLATIONS
The disruptive phase of the m = 1 sawtooth oscillations in Tokamaks is examined. It is shown that, depending on the shear, the disruptive phase could be related either to an m = 1 island filling the plasma core, or to the growth of large scale stochasticity surrounding the island which is generated by interaction of the island dynamics with the perturbation. The latter situation, associated with high shear at the m = 1 surface, and therefore low q on axis, is characteristic of some recent experiments. In particular, it is shown that the observations of m = 1 sawtooth oscillations reported in TFR are consistent with the development of a large stochastic layer. There are no adjustable parameters in the theory; reasonable values are assumed for those quantities not known precisely.
Bibliographic Reference: WRITE TO CEA MENTIONING REPORT EUR-CEA-FC-1215 EN, 1983
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Record Number: 1989122075700 / Last updated on: 1987-01-01
Available languages: en