Influence of Penetrating Defect in DD Ice Layer on ICF Cryogenic Capsule Implosion Performance

doi:10.19596/j.cnki.1001-246x.8429

Abstract

Abstract:

A two-dimensional radiation diffusion hydrodynamic code LARED-S is used to investigate evolution behavior of a penetrating defect and its influences on square-pulsed DD cryogenic capsule implosion performance. It shows that a penetrating defect on DD ice layer reduces significantly the neutron yield with a YOC of 23.8%. The defect makes the Si-doped CH ablator layer produce a high-amplitude inward-facing spike, penetrating into the central DD gas. A large amount of ablation material is mixed into the hot spot with a mixing mass of 487 ng, leading to a significant increase in the bremsstrahlung radiation loss power from the hot spot compared to the 1D ideal implosion result. It results in a large reduction in the hot-spot temperature and the final DD reaction rate. Meanwhile, the high-density shell spike pushes the hot spot away from the capsule center, exhibiting a great P1 asymmetry. The P1-asymmetric hot spot has an obvious bulk flow velocity, which reduces the conversion efficiency of implosion kinetic energy into the internal energy of the hot spot.

Key words: inertial confinement fusion, deuterium-deuterium ice layer, penetrating defect, P1 asymmetry

Jianfa GU, Fengjun GE, Zhensheng DAI, Dongguo KANG, Shiyang ZOU. Influence of Penetrating Defect in DD Ice Layer on ICF Cryogenic Capsule Implosion Performance[J]. Chinese Journal of Computational Physics, 2022, 39(3): 268-276.

Figures/Tables 10

Fig.1 (a) Radiation temperature curve of a square-pulse implosion; (b) A schematic of the capsule configuration

Fig.2 Initial defects on inner surface of the DD ice (a) AL=15 μm and (b) AL= 27 μm

Fig.3 Two-dimensional density profiles at t=1.8 ns of the acceleration phase (a) AL=15 μm and (b) AL= 27 μm

Fig.4 2D density profiles at peak velocity (t=2.0 ns) for the case of (a) AL=15 μm and (b) AL=27 μm

Fig.5 (a) Density and (b) ion temperature profiles at bang-time for the case of AL=15 μm; (c) Density and (d) ion temperature profiles for the case of AL= 27 μm

Fig.6 Post-processing neutron images for the cases of (a) AL=15 μm and (b) AL= 27 μm

Fig.7 (a) P1 asymmetry amplitude of the hot spot and (b) hot-spot temperature as functions of the amplitude of void on the inner DD interface

Fig.8 (a) DD reaction rate as a function of time for the 1D ideal implosion (black curve) and 2D implosion simulation with AL=15 μm (red curve) and AL=27 μm (blue curve); (b) 2D yield over clean (YOC) as a function of the amplitude of void on the inner DD interface

Fig.9 Loss power of the bremsstrahlung radiation from the hot spot as a function of time for the 1D implosion (black curve) and 2D simulation with AL=15 μm (red curve) and 27 μm (blue curve) for a void defect on the DD ice

Fig.10 Density profiles at bang-time for the 2D case of AL= 27 μm (Black curves are fluid streamlines.)

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