The re-emitted images of the frame camera indicated that the high-Z(Bi) capsule deviated about 29 μm from the center of the hohlraum in experiments at the Shenguang-II(SG-II)laser facility; however, investigations on...The re-emitted images of the frame camera indicated that the high-Z(Bi) capsule deviated about 29 μm from the center of the hohlraum in experiments at the Shenguang-II(SG-II)laser facility; however, investigations on this issue have seldom been performed. The influence of three dimensional offsets of a capsule on its radiation asymmetry in inertial confinement fusion(ICF) will be analyzed in this paper. Simulations demonstrate that the axial offset of 100 μm of a capsule from the center of the hohlraum brings an additional 3.5% radiation drive asymmetry and 6.5% P_1 asymmetry(Legendre odd model) on the capsule in the SG-II laser facility, and the offset must be within 25 μm if the P_1 asymmetry is restricted to below 2%.展开更多
Angular distribution of radiation temperature from a laser-driven hohlraum is vital for investigations on the radiation field inside the hohlraum, code validation, and predication of drive on the capsule in indirect-d...Angular distribution of radiation temperature from a laser-driven hohlraum is vital for investigations on the radiation field inside the hohlraum, code validation, and predication of drive on the capsule in indirect-drive inertial confinement fusion. A modified version of the view-factor method including plasma filling is proposed, which improves the accuracy of the description of angular distribution of radiation temperature. Firstly, the radial velocity of the gold bubble motion is scaled from a simple data-based model in a gas-filled hohlraum experiment performed on a hundreds of kJ laser facility in China. Then, an equivalent radiative volume model is advanced to approximately characterize the contribution of the blow-off bubble in the new view-factor method incorporate into IRAD3D. The simulation shows reasonable agreement with experimental measurements in a gas-filled hollow hohlraum. Furthermore, the influence of the electron density and temperature distribution, and bubble velocity, is analyzed. The value of the method is that it can be used as an approximate 'first-look' at hohlraum energy balance prior to a more detailed radiation hydrodynamic modeling.展开更多
基金supported by Science and Technology on Plasma Physics Laboratory of China(Nos.9140C680104140C68287,9140C680104130C68241)in part by National Natural Science Foundation of China(Nos.11475154,51375185,U1430124,11435011,11305160)
文摘The re-emitted images of the frame camera indicated that the high-Z(Bi) capsule deviated about 29 μm from the center of the hohlraum in experiments at the Shenguang-II(SG-II)laser facility; however, investigations on this issue have seldom been performed. The influence of three dimensional offsets of a capsule on its radiation asymmetry in inertial confinement fusion(ICF) will be analyzed in this paper. Simulations demonstrate that the axial offset of 100 μm of a capsule from the center of the hohlraum brings an additional 3.5% radiation drive asymmetry and 6.5% P_1 asymmetry(Legendre odd model) on the capsule in the SG-II laser facility, and the offset must be within 25 μm if the P_1 asymmetry is restricted to below 2%.
基金supported by National Natural Science Foundation of China (Nos. 11775204, 11805186, 11805187)Presidential Foundation of China Academy of Engineering Physics (No. YZJJLX2018011)。
文摘Angular distribution of radiation temperature from a laser-driven hohlraum is vital for investigations on the radiation field inside the hohlraum, code validation, and predication of drive on the capsule in indirect-drive inertial confinement fusion. A modified version of the view-factor method including plasma filling is proposed, which improves the accuracy of the description of angular distribution of radiation temperature. Firstly, the radial velocity of the gold bubble motion is scaled from a simple data-based model in a gas-filled hohlraum experiment performed on a hundreds of kJ laser facility in China. Then, an equivalent radiative volume model is advanced to approximately characterize the contribution of the blow-off bubble in the new view-factor method incorporate into IRAD3D. The simulation shows reasonable agreement with experimental measurements in a gas-filled hollow hohlraum. Furthermore, the influence of the electron density and temperature distribution, and bubble velocity, is analyzed. The value of the method is that it can be used as an approximate 'first-look' at hohlraum energy balance prior to a more detailed radiation hydrodynamic modeling.
