The rapid collapse of a sawtooth oscillation in the JET tokamak has been observed in detail on a fast time scale. Tomographic reconstruction of data from two x-ray cameras and electron-cyclotron-emission temperature profiles show that during the sawtooth collapse the central hot region is rapidly (in approximately 100 {μ}s) displaced off axis with an $m=1$ component and is then redistributed around a surface of constant minor radius. The theoretical implications of the measurements are discussed.
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Edwards et al. (1986) studied this question.
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