Determining the equation-of-state isentrope in an isochoric heated plasma

A novel method for determining the equation-of-state (EOS) along the release isentrope in an isochoric (constant volume) heated plasma is presented. This approach is demonstrated using simulations of a solid density, 10 eV expanding Al plasma. Determining the material EOS data is validated to pressures near 80 Mbar , much higher than current isentropic compression experiments allow. Limitations at very high temperature (T e ⩾100 eV ) , due to the formation of a radiative conduction layer near the rarefaction interface, are also discussed.