Multi-species transport in RT instability during ICF implosion

Evidence suggests performance in ICF experiments may be limited by hydrodynamic and transport mixing processes in the deceleration phase driven by Rayleigh-Taylor, RT, instability. This instability has a wavelength dependent maximum growth rate which is strongly determined by plasma viscous and diffusive transport processes. These processes have recently been seen in simulations to be important at early times and may therefore strongly influence the RT instability growth and mixing during deceleration. Based on rigorously derived plasma transport properties during implosions in a typical (Omega-like) implosion of CH shell on DT fuel, we estimate a range of maximum unstable RT wavelengths from a few to a few tens of microns. We present profiles of the viscosity and viscosity-limited maximum RT growth rates across typical mixing profiles between the four dominant ions in the fuel and shell. The AMR radiation-hydro code, xRage, with full multi-species plasma transport, is used in 2D RT instability simulations to examine growth rates for prescribed mode initial conditions and for plasma transport properties varying over a range expected during ICF implosions. We compare the fluid transport results for RT and for Richtmyer-Meshkov instabilities to kinetic simulations where feasible.