Semi-hydro-equivalent design and performance extrapolation between 100 kJ-scale and NIF-scale indirect drive implosion

Zhang Huasen; Kang Dongguo; Wu Changshu; Hao Liang; Shen Hao; Zou Shiyang; Zhu Shaoping; Ding Yongkun

doi:10.1063/5.0150343

Volume 9 Issue 1

Jan. 2024

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Zhang Huasen, Kang Dongguo, Wu Changshu, Hao Liang, Shen Hao, Zou Shiyang, Zhu Shaoping, Ding Yongkun. Semi-hydro-equivalent design and performance extrapolation between 100 kJ-scale and NIF-scale indirect drive implosion[J]. Matter and Radiation at Extremes, 2024, 9(1): 015601. doi: 10.1063/5.0150343

Citation:

Zhang Huasen, Kang Dongguo, Wu Changshu, Hao Liang, Shen Hao, Zou Shiyang, Zhu Shaoping, Ding Yongkun. Semi-hydro-equivalent design and performance extrapolation between 100 kJ-scale and NIF-scale indirect drive implosion[J]. Matter and Radiation at Extremes, 2024, 9(1): 015601. doi: 10.1063/5.0150343

Citation:

Zhang Huasen, Kang Dongguo, Wu Changshu, Hao Liang, Shen Hao, Zou Shiyang, Zhu Shaoping, Ding Yongkun. Semi-hydro-equivalent design and performance extrapolation between 100 kJ-scale and NIF-scale indirect drive implosion[J]. Matter and Radiation at Extremes, 2024, 9(1): 015601. doi: 10.1063/5.0150343

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Semi-hydro-equivalent design and performance extrapolation between 100 kJ-scale and NIF-scale indirect drive implosion

doi: 10.1063/5.0150343

1.
Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 10088, China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 10088, China

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Corresponding author: a)Author to whom correspondence should be addressed: kang_dongguo@iapcm.ac.cn
Received Date: 2023-03-14
Accepted Date: 2023-09-22

Available Online: 2024-01-01

Publish Date: 2024-01-01

Abstract

Abstract

Extrapolation of implosion performance between different laser energy scales is investigated for indirect drive through a semi-hydro-equivalent design. Since radiation transport is non-hydro-equivalent, the peak radiation temperature of the hohlraum and the ablation velocity of the capsule ablator are not scale-invariant when the sizes of the hohlraum and the capsule are scale-varied. A semi-hydro-equivalent design method that keeps the implosion velocity V_i, adiabat α_F, and PL/Rhc2 (where P_L is the laser power and R_hc is the hohlraum and capsule scale length) scale-invariant, is proposed to create hydrodynamically similar implosions. The semi-hydro-equivalent design and the scaled implosion performance are investigated for the 100 kJ Laser Facility (100 kJ-scale) and the National Ignition Facility (NIF-scale) with about 2 MJ laser energy. It is found that the one-dimensional implosion performance is approximately hydro-equivalent when V_i and α_F are kept the same. Owing to the non-hydro-equivalent radiation transport, the yield-over-clean without α-particle heating (YOC_noα) is slightly lower at 100 kJ-scale than at NIF-scale for the same scaled radiation asymmetry or the same initial perturbation of the hydrodynamic instability. The overall scaled two-dimensional implosion performance is slightly lower at 100 kJ-scale. The general Lawson criterion factor scales as χnoα2D∼S1.06±0.04 (where S is the scale-variation factor) for the semi-hydro-equivalent implosion design with a moderate YOC_noα. Our study indicates that χ_noα ≈ 0.379 is the minimum requirement for the 100 kJ-scale implosion to demonstrate the ability to achieve marginal ignition at NIF-scale.

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References(40)

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