The stability of a rotating ϑ pinch is investigated in the context of the finite Larmor radius fluid equations. The main result is the discovery of an unstable m=1, n=0 mode (m is the azimuthal mode number and n is the number of radial modes) whose threshold is the lowest of any unstable mode. A comparison with experiment indicates that this mode may be the one responsible for the m=1 ’’wobble’’ instability observed in high temperature ϑ pinches.
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Freidberg et al. (1978) studied this question.
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