Rotational instabilities in the field-reversed configuration: Results of hybrid simulations

摘要: Rotational instabilities in rigidly rotating field‐reversed configuration (FRC) equilibria are studied using a quasineutral hybrid simulation code. We observe unstable m=2 modes at levels of ion rotation below instability thresholds predicted by finite‐Larmor‐radius fluid theory. Nonlinear effects found to reduce the growth rate and lower real frequency mode large amplitude. Instabilities with m>2 have been observed for strongly reversed cases. It is also that rates these can be reduced increasing ratio plasma radius Larmor radius.