An experimental analysis is made of the scattering of microwaves by the density fluctuations due to the current-driven ion-wave instability in a toroidal plasma confinement device, the FM-1 spherator. It is found that the instability exists in the collisional regime and it is inhibited (i.e., quenched by two order of magnitude) in the trapped-electron (i.e., banana) regime. The inhibition occurs when the electron collision frequency is about equal to the electron bounce frequency between mirror trapping.
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Arunasalam et al. (1976) studied this question.