Numerical simulation of radiating z-pinch on “Gamma”

Summary form only given. In RFNC-VNIIEF 16 module electrophysical facility “Gamma” with output electric power ~24 TW [1] is being developed. It is meant for generation of powerful pulses of both bremsstrahlung and soft X-ray (SXR) radiation. The paper presents results of 2D radiation magnetohydrodynamic (RMHD) calculations, conducted to predict parameters of generated SXR pulse at operation of facility “Gamma” with a common liner load.A process of implosion and pinching of continuous (in azimuthal direction) cylindrical tungsten liner with initial radius Ro=1.6 cm, height /=2 cm has been calculated with the aid of two-dimensional (in cylindrical coordinates r-z) RMHD code FLUX-rz developed in RFNC-VNIIEF [2]. The employed physical model is a single-fluid, two-temperature (electrons and ions with average charge <;Z and it takes into account the processes of electron and ion heat conductivity as well as heat radiation transfer calculated in a mUlti-group diffusion approximation. A specific feature of solvable system of RMHD equations is accounting of displacement currents in Maxwell equations, what allows end-to-end calculation of evolution of electromagnetic field in the space areas with negligibly low electrical conductivity (including vacuum with 0"=0). Besides, the model takes into account an experimentally observed process of the prolonged plasma ablation in multi-wire Z-pinches [3]. It is shown that on the facility Gamma one can obtain depending on technical implementation of the load (a multiwire cylindrical array) a current pulse with an amplitude ::11 MA and total duration (from zero up to current maximum) ::70 ns. As a result of implosion of dynamic Z-pinch one expects generation of SXR pulse with duration 5+8.6 ns, corresponding maximal power 120+80 TW, and total energy in the main pulse 800 kJ.