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Strong magnetohydrodynamic activity has been observed in PDX neutral-beam-heated discharges. It occurs for ₓq>~0. 045 and is associated with a significant loss of fast ions and a drop in neutron emission. As much as 20%-40% of the beam heating power may be lost. The instability occurs in repetitive bursts of oscillations of 1 msec duration at 1-6-msec intervals. The magnetohydrodynamic activity has been dubbed the "fishbone instability" from its characteristic signature on the Mirnov coils.
McGuire et al. (1983) studied this question.
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