Mitigation Effect of Finite Larmor Radius on Rayleigh-Taylor Instability in Z-Pinch Implosions

Based on the framework of magnetohydrodynamic theory, a simple model is proposed to study the mitigation effect of finite Larmor radius on the Rayleigh-Taylor instability in Z-pinch implosions. In this model, taking account of T_i ≥t T_e in Z-pinch implosions we believe that the magnetohydrodynamic plasma responds to a perturbation (～ expi( k .x - ωt)) at frequency (ω + ik²_⊥ρ²_iΩ_i) instead of frequency ω, where k²_⊥ρ²_i is due to the finite Larmor radius effects expressed from the general kinetic theory of magnetized plasma. Therefore the linearized continuity and momentum equations for the perturbed mass-density and velocity include the finite Larmor radius effects. The calculations indicate that in the wavenumber region of interest the finite Larmor radius effects can mitigate the Rayleigh-Taylor instability in Z-pinch implosions.