Numerical studies on the radiation uniformity of quasi-spherical Z-pinch dynamic hohlraum using code MULTI-2D

Z-pinch driven fusion is a promising approach for the realization of fusion energy due to its high energy conversion efficiency and robust ignition scheme. Typical Z-pinch dynamic hohlraum driven fusion involves a spherical pellet imploded by the x-ray radiation field inside the hohlraum. When the hohlraum is created by the collision of a cylindrical wire-array and plastic foam, the fronts of the shock and thermal wave propagating towards the pellet are cylindrical as well, making the pellet tend to be ablated and compressed asymmetrically. With the help of quasi-spherical implosion, both the shock front and thermal wave front can be modulated, so that the radiation uniformity around the pellet can be improved significantly. Besides, a higher radiation temperature can be achieved because of the three-dimensional compression in quasi-spherical Z-pinch dynamic hohlraum. In this report, we present simulation results about the hohlraum radiation uniformity with/without a pellet inside on Julong-I facility (~8MA). Simulations are conducted using the one-group, two-temperature radiation magneto-hydrodynamic code MULTI-2D.