240 / 2023-04-18 22:02:52

Experimental Characterization of Nanosecond-laser-drive Collisionless Electrostatic Shocks

惯性约束聚变物理学 > 惯性约束聚变物理学-海报

In recent years, inertial confinement fusion has made a series of important progress, and recently the historic breakthrough of fusion ignition has been achieved. Some non-equilibrium kinetic processes, such as ion separation, diffusion, penetration, interface electromagnetic field, etc., which are not included in fluid simulation, are considered as one of the important reasons that affect the further improvement of fuel gain. In indirect-drive inertial confinement fusion experiments with vacuum or low-gas fill hohlraums, collisionless electrostatic shocks can be launched in the hohlraum wall/alblator (or the low-density fill-gas) interpenetration region. With the gas-jet target, we designed the experiment of collisionless electrostatic shocks driven by laser ablation warm Au plasma in background gas. Simultaneous characterization of shock velocity and energy spectrum of reflected ion is realized, which gives the direct experimental evidence of nanosecond-laser-drive collisionless electrostatic shocks. By using mixed gas of hydrogen and deuterium, the energy spectra of H ion and D ion are obtained at the same time, which provide first-hand experimental data for the detailed mechanism investigation of shock reflecting ions.