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Analysis of the evolution of plasma parameters during sawteeth in Ohmically- and electron cyclotron-heated plasma in the T-10 Tokamak (a L =0.3 m, R 0 =1.5 m) reveals that the sawtooth crashes are associated with values of the electron temperature gradient d(ln T c )/dr at the q=1 surface in excess of a critical value.
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Savrukhin et al. (1991) studied this question.
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