145 / 2025-03-15 20:28:35

Numerical investigation on Z-pinch dynamic hohlraum driven double shell implosions

Z-pinch dynamic hohlraum,double shell capsule,drive asymmetries

The fast Z-pinch has shown the potential of driving inertial confinement fusion. Based on the Z-pinch dynamic hohlraum (ZPDH) configuration at a future 50 MA pulsed power facility, the preliminary research on the ZPDH evolution and the coupling of ZPDH with double shell capsule was carried out by using the LARED code. First, the dependence of ZPHD performance on the foam parameters was studied. Given a fixed foam radius, with increasing the mass ratio of foam to wire-array both the shock velocity in the foam and the radiation temperature would be increased. However, the hohlraum temperature was reduced significantly with increasing the foam radius. Second, the coupling of ZPDH with the double shell capsule was studied. The time-dependent radiation temperature and P2 drive asymmetries seen by the capsule were obtained, the peak of the radiation temperature could reach 300 eV. It was found that the asymmetry of radiation field was large before the radiation heat wave arrived at the axis. After that, the radiation field became relatively uniform. However, as the shock in the foam propagated inward, the ablated plasma of the capsule would interact with the shock, this caused that the radiation temperature at the equator was higher than that at the axis. At late times, as the shock arrived at the axis, the radiation temperature at the axis would be higher than that at the equator, thus the phase of P2 drive asymmetry was inversed. In addition, we also analyzed the effect of drive asymmetries on the double shell implosion performance.