Abstract
The beta-degradation phase of a high-{beta}{sub {ital p}} plasma in the TFTR tokamak is analyzed with x-ray and electron cyclotron emission imaging techniques. Medium-{ital n} (toroidal mode number) instabilities with ballooning characteristics are observed near and within the {ital q}=1.5 surface during a slow degradation in the plasma {beta} and precede a sudden partial collapse in the central plasma pressure. This is the first reported observation of a ballooning instability in the interior of a large, collisionless tokamak plasma.
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