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 Ti≥Te in Z-pinch implosions we believe that the magnetohydrodynamic plasma responds to a perturbation (-exp[i(k·x-ωt)]) at frequency (ω+ik⊥^2ρi^2Ωi) instead of frequency ω,where k⊥^2ρi^2 is due to the finite Larmor radius effects expressed from the general inetic 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 calculation indicate that,in the wavenumber region of interest,the finite Larmor radius effects can mitigate the Rayleigh-Taylor instability in Z-pinch implosions.
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