Numerical Analysis of the Hydrodynamic Behavior of Ion-beam-heated Uranium Targets for Equation-of-state Studies under Extreme Conditions

摘要: Abstract The equation of state (EOS) fissile materials under extreme thermodynamic conditions is great importance to assess the safety nuclear energy systems related extremely severe accidents and intentional terrorism. In this study, for a simple, safe, precise measurement these properties, we propose an experimental setup in which small amount material sample homogeneously heated by intense short-pulsed heavy-ion beam, subsequent hydrodynamic motion examined. As example, investigated response slab uranium foam (density = 5% solid density) pulsed 23 Na + beam with duration 2 ns peak irradiation flux 5 GW/mm 2 . target thickness incident were adjusted 80 μm 1.5 MeV/u, respectively, beam-energy deposition occur almost at top Bragg inhomogeneity stopping power be ±2.5%. during after was calculated one-dimensional radiation code. To calculate target, used density- temperature-dependent projectile data obtained finite-temperature Thomas-Fermi atomic model degeneracy-dependent dielectric functions. numerical results showed that isometrically up ≈ 10 5  K well before rarefaction wave reached center fairly homogeneous temperature density distributions end pulse duration. We discuss feasibility EOS studies, such as evaluation pressures off-Hugoniot function internal from measurements expansion velocity.