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Drift waves in a cylindrical plasma column with an exponential density profile have a Bessel function mode structure and are linearly unstable because of finite Larmor radius effects. In the presence of a lower hybrid eigenmode pump, these modes suffer a nonlinear frequency upshift because of the ponderomotive force and tend to be stabilized when k0z>kz.
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Praburam et al. (1988) studied this question.
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