A High-adiabat and High-velocity Capsule Imploded by High Hybrid-drive Pressure for Inertial Confinement Fusion

doi:10.19596/j.cnki.1001-246x.8626

Abstract

Abstract:

We report new progress in hybrid-drive (HD) ignition target design with a high-adiabat (>3.0) and high-velocity (>400 km·s^-1). First, two-shock indirect-drive (ID) radiation temperature with lower peak 200 eV ablates and pre-compresses the capsule. Later, direct-drive lasers of power 340 TW in flat-top pulse are absorbed near critical surface, combined with the radiation to drive the implosions. The "snowplow" effect in the HD heaps low ID corona density into a high HD plasma density at the radiation ablation front where maximal HD pressure reaches over 500 Mbar. Such high pressure further drives capsule imploding with peak velocity about 424.5 km·s^-1 and fuel aidabat about 3.4, and the high-velocity and high-adiabat lower the hotspot pressure required to ignition lower to about 200 Gbar at a low convergent ratio 23 to suppress hydrodynamic instabilities. 2D simulation also predicts the growth factor (GF) at hotspot is very small < 10, beneficial for a robust hotspot and further burn.

Key words: hybrid-drive, high implosion velocity, high adiabat, growth factor, robust hot spot

Jiwei LI, Lifeng WANG, Zhiyuan LI, Yaohua CHEN, Yan XU, Minqing HE, Bin LI, Junfeng WU, Wenhua YE, Xiantu HE. A High-adiabat and High-velocity Capsule Imploded by High Hybrid-drive Pressure for Inertial Confinement Fusion[J]. Chinese Journal of Computational Physics, 2023, 40(2): 181-188.

Figures/Tables 9

Fig.1 Ignition required hotspot pressure for different internal energy of hotspot

Fig.2 Schematic of the high-velocity and high-adiabat hybrid-drive ignition target where (a) is the capsule, (b) is the indirect-drive radiation temperature including the M-band and direct-drive laser power

Fig.3 Implosion dynamics of the shock, interface and the inflight shell in hybrid-drive by one-dimensional simulation

Fig.4 Pressure of the hybrid-driven plateau between the CWF and RAF

Fig.5 Effect of the radiation temperature on (a) the averaged adiabat of fuel and (b) density of the shell at end of the drive source

Table 1 Effect of the peak radiation temperature on the hybrid-driven ignition

峰值辐射温度/eV	放能/MJ	内爆速度/(km·s^-1)	熵增	燃料面密度/(g·cm^-2)
200	17.12	425	3.43	1.06
180	12.87	420.7	3.756	1.0
170	9.375	419.1	4.11	0.964
160	1.07	408.9	4.863	0.775

Table 2 Effect of the direct-drive laser power on the hybrid-driven igntion

直驱光功率/TW	放能/MJ	内爆速度/(km·s^-1)	熵增	燃料面密度/(g·cm^-2)
340	17.12	425	3.43	1.06
320	16.5	421.2	3.46	1.055
300	13.5	410.1	3.65	1.02

Fig.6 Comparisons of the linear growth factor (GF) at (a) the ablation front and (b) hotspot interface for the HD and ID CH high-foot design

Fig.7 Degradation of Y2D/Y1D by the laser intensity nonuniformity

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