Inhibition of the current-driven ion-wave instability in the trapped- electron regime in the FM-1 spherator

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 orders 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. (AIP)