The laser-hohlraum wall interaction and the shock wave induced by expanding Au bubble in low-Z filled gas are self-consistently investigated via a two-dimensional hybrid fluid-PIC code. Under the irradiation of the laser, the hohlraum wall expands quickly and propagates into the tenuous plasma, giving rise to the formation of an arc-shaped shock wave. Simulations revealed an asymmetric shock front and shock-reflected ions. Due to the deposition of laser energy, the electron temperature along the laser path increases quickly, weakening the potential barrier of the shock. The lower potential barrier makes it easier for ions from the upstream region to pass through the shock front into the downstream region. In regions far from the laser path, the electron temperature is lower, which results in a higher potential barrier of the shock, causing a portion of ions from the upstream region to be reflected by the shock wave. The study is helpful for understanding the hohlraum physics in the indirect-drive inertial confinement fusion experiments.

laser-hohlraum wall interaction,hybrid fluid-PIC,shock wave