Investigation of the cylindrical vacuum hohlraum energy in the first implosion experiment at the SGIII laser facility

Zhang, Huasen; Jiang, Wei; Ge, Fengjun; Song, Peng; Zou, Shiyang; Huang, Tianxuan; Li, Sanwei; Yang, Dong; Li, Zhichao; Hou, Lifei; Guo, Liang; Che, Xingsen; Du, Huabing; Xie, Xu; He, Xiaoan; Li, Chaoguang; Zha, Weiyi; Xu, Tao; Liu, Yonggang; Wei, Huiyue; Liu, Xiangming; Chen, Zhongjing; Zou, Xing; Yan, Jiwang; Pu, Yudong; Peng, Xiaoshi; Li, Yulong; Gu, Peng; Zheng, Wudi; Liu, Jie; Ding, Yongkun; Zhu, Shun‐Peng

doi:10.1063/1.5013252

Cited by 10 publications

(5 citation statements)

References 35 publications

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“…In particular, the calculations become much lower than the experiments with the increase of time. The calculations with ERV show reasonable agreement with the measurements of all angles within the ±3% accuracy of the experimental observation [18,54,57]. It merits mentioning that the plasma filling has slight impact on the radiation temperature from the U42.…”

Section: Model Validation With Experimentssupporting

confidence: 78%

“…The laser-to-x-ray conversion efficiency was calculated with a scaling equation h = t 0.8 , X ns 0.12 which is based on detailed numerical simulations [1,2,51]. This scaling law is applied to the case with a shot-length (no more than 3 ns) square pulse [12,[52][53][54]. With these two parameters and equations (2) and (3), the time-varying albedo and radiation temperature inside the hohlraum can be iteratively calculated, as drawn in figure 3.…”

Section: Model Validation With Experimentsmentioning

confidence: 99%

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An improved view-factor method including plasma filling for angular distribution of radiation temperature from a laser-driven hohlraum

Jing

Jiang

Kuang

et al. 2020

Plasma Sci. Technol.

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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.

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Section: Model Validation With Experimentssupporting

confidence: 78%

Section: Model Validation With Experimentsmentioning

confidence: 99%

An improved view-factor method including plasma filling for angular distribution of radiation temperature from a laser-driven hohlraum

Jing

Jiang

Kuang

et al. 2020

Plasma Sci. Technol.

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“…Furthermore, the CR should be lower than 25 to avoid the influence of the 270 nm-thick support tent [44, 45, and 50]. On the other hand, the CR should be greater than 16 to make the implosion performance more sensitive to driven asymmetry [46,48].…”

Section: Experimental Design and Numerical Simulation Codementioning

confidence: 99%

“…Its output lies in between the energy and power of the OMEGA and NIF facilities. A large amount of indirect-drive-implosion experimental work was performed to study the performance of implosions with convergences from 15 to 30 [46][47][48][49][50]. Previous work demonstrated that a square-pulse design with a lower convergence (∼15) achieved a higher implosion performance (the yield measured by 1D simulation (YOC 1D ) reached over 50%).…”

Section: Introductionmentioning

confidence: 99%

The influence of driven asymmetry on yield degradation in shaped-pulse indirect-drive implosion experiments at the 100 kJ laser facility

et al. 2020

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The influence of low-mode-driven asymmetry on yield degradation in shaped-pulse indirect-drive implosions has been investigated at the 100 kJ laser facility. In this work, P2- and P4-driven asymmetries were tuned by varying hohlraum gas-fill density and capsule diameter. The measured neutron yield varied from 2.1 × 109 to 7.6 × 109 and the yield measured by a 1D simulation (YOC1D) was increased from 3% to 16%. Meanwhile, considering the temporal P2- and P4-driven asymmetries, the yields measured by 2D simulations (YOC2D) were from 26% to 81% (the YOC2D of the majority of the shots was higher than 50%). Furthermore, both the ion temperature and neutron bang-time showed good agreement between the measurements and the 2D simulations. The simulations demonstrated that the temporal P2- and P4-driven asymmetries can decrease the efficiency of PdV work and increase the energy loss due to electron thermal conduction. In addition, the internal energy of the deuterium (DD) fuel clearly decreased and the neutron yield was degraded by low-mode asymmetry. In a future work, we will enlarge the cylindrical hohlraum diameter or use an I-hohlraum to improve the low-mode-driven symmetry, along with measurement of the hot-spot shape.

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“…The hohlraum simulation was carried out with the 2D integrated code LARED-JC [27], and the comparison with the measured angular distribution of radiation flux was discussed elsewhere [24]. The capsule simulation was carried out with the 1D Lagrangian radiation hydrodynamic code RDMG [28].…”

Section: Comparison Between Experiments and Simulationsmentioning

confidence: 99%

First integrated implosion experiments on the SG-III laser facility

Huang

et al. 2018

Plasma Phys. Control. Fusion

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We present the first integrated implosion experiments which were carried out on the SG-III Laser facility in 2015. Vacuum hohlraums and squared laser pulses were used in the experiments. The purpose of the experiments was to demonstrate the one-dimensional implosion performance at low-convergence ratios. To characterize the implosion performance, the hohlraum energetics, the implosion dynamics and the nuclear products were measured. In particular, the radiation flux was diagnosed through laser entrance hole at different angles by an array of flat response detectors, and the energy and the spectrum of the back-scattered lasers were monitored for 8 laser beams which correspond to 2 beams in each cone at the lower hemisphere. Moreover, the hotspot shape was imaged using KB microscopes of high spatial resolution simultaneously from the equator and polar views. Taking advantage of the high resolution, some detailed structures in the hotspots were noticed. For the best implosion performances, the neutron yields over 1D calculation reached 50% at the convergence-ratios of 15.

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Investigation of the cylindrical vacuum hohlraum energy in the first implosion experiment at the SGIII laser facility

Cited by 10 publications

References 35 publications

An improved view-factor method including plasma filling for angular distribution of radiation temperature from a laser-driven hohlraum

An improved view-factor method including plasma filling for angular distribution of radiation temperature from a laser-driven hohlraum

The influence of driven asymmetry on yield degradation in shaped-pulse indirect-drive implosion experiments at the 100 kJ laser facility

First integrated implosion experiments on the SG-III laser facility

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