Two-dimensional radiative transfer calculations of the laser-target hohlraum

Shuanggui, 李双贵 Li; Chuanlei, 翟传磊 Zhai; Xudeng, 杭旭登 Hang; Heng, 勇珩 Yong; Yiqing, 赵益清 Zhao; Xin, 李欣 Li; Jinghong, 李敬宏 Li; Wudi, 郑无敌 Zheng; Peijun, 古培俊 Gu

doi:10.3788/hplpb20142608.82002

Cited by 7 publications

(1 citation statement)

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“…The angleaveraged ρR s (t), v s (t), and R s (t) in equations ( 13), ( 14), (18), and (19) were obtained from 1D multi-group radiation transfer (MGRT) code RDMG [31]. The 2D capsule-only simulations were performed using the 2D MGRT code LARED [32][33][34]. Both RDMG and LARED use the average-atom (AA) model and the flux-limited thermal conduction.…”

Section: Model Applications and Discussionmentioning

confidence: 99%

A 2D dynamic model for the impact of time-dependent low-mode drive asymmetries on the shell asymmetries during acceleration phases of ICF implosions

Li¹,

Gu²,

Kang³

et al. 2023

Plasma Phys. Control. Fusion

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Low-mode drive asymmetries are known as signiﬁcant performance degradation factors in indirect-drive inertial conﬁnement fusion (ICF) implosions. We propose a two-dimensional (2D) dynamic model to explore the impact of time-dependent low-mode drive asymmetries on the shell asymmetries in acceleration phases of implosions. Since during acceleration, the shell areal density (ρRs) asymmetries are relatively small, we can treat the shell as thin shell pieces with ﬁnite mass and inﬁnitesimally small thicknesses, neglecting the angular ﬂows between these pieces. The radial motion of each shell piece is dominated by Newton’s law. Through this model, the evolution of the shell radial velocity vs and the shell radius Rs asymmetries of degree n can be characterized in terms of the drive temperature, time-dependent drive asymmetry of degree n and the average ρRs, vs, Rs obtained from one-dimensional (1D) simulations. The acceleration phases of typical gas-ﬁll capsule and layered DT capsule implosions with P2 or P4 drive asymmetries are explored using this model and validated using both 2D radiation hydrodynamic simulations and available backlit shell distortion measurements. This model gives a useful tool for ICF design, with an advantage of simplicity and speed.

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Section: Model Applications and Discussionmentioning

confidence: 99%

A 2D dynamic model for the impact of time-dependent low-mode drive asymmetries on the shell asymmetries during acceleration phases of ICF implosions

Li¹,

Gu²,

Kang³

et al. 2023

Plasma Phys. Control. Fusion

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Investigating the hohlraum radiation properties through the angular distribution of the radiation temperature

et al. 2016

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The symmetric radiation drive is essential to the capsule implosion in the indirect drive fusion but is hard to achieve due to the non-uniform radiation distribution inside the hohlraum. In this work, the non-uniform radiation properties of both vacuum and gas-filled hohlraums are studied by investigating the angular distribution of the radiation temperature experimentally and numerically. It is found that the non-uniform radiation distribution inside the hohlraum induces the variation of the radiation temperature between different view angles. The simulations show that both the angular distribution of the radiation temperature and the hohlraum radiation distribution can be affected by the electron heat flux. The measured angular distribution of the radiation temperature is more consistent with the simulations when the electron heat flux limiter fe=0.1. Comparisons between the experiments and simulations further indicate that the x-ray emission of the blow-off plasma is overestimated in the simulations when it stagnates around the hohlraum axis. The axial position of the laser spot can also be estimated by the angular distribution of the radiation temperature due to their sensitive dependence. The inferred laser spot moves closer to the laser entrance hole in the gas-filled hohlraum than that in the vacuum hohlraum, consisting with the x-ray images taken from the framing camera. The angular distribution of the radiation temperature provides an effective way to investigate the hohlraum radiation properties and introduces more constraint to the numerical modeling of the hohlraum experiments.

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

Zhang

Jiang

et al. 2018

Physics of Plasmas

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The cylindrical vacuum hohlraum energy at the SGIII laser facility [X. T. He and W. Y. Zhang, Eur. Phys. J. D 44, 227 (2007) and W. Zheng et al., High Power Laser Sci. Eng. 4, e21 (2016)] is investigated for the first time. The hohlraum size and the laser energy are intermediate between the Nova and NIF typical hohlraum experiments. It is found that the SGIII hohlraum exhibits an x-ray conversion efficiency of about 85%, which is more close to that of the NIF hohlraum. The LARED simulations of the SGIII hohlraum underestimate about 15% of the radiation flux measured from the laser entrance hole, while the capsule radiation drive inferred from the x-ray bangtime is roughly consistent with the experiments. The underestimation of the SGIII hohlraum radiation flux is mainly caused by the more enclosed laser entrance hole in the LARED simulation. The comparison between the SGIII and NIF hohlraum simulations by LARED indicates that the LARED generally underestimates the measured radiation flux by 15% for the high x-ray conversion efficiency hohlraums, while it can roughly predict the capsule radiation drive inside the hohlraum.

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Two-dimensional radiative transfer calculations of the laser-target hohlraum

Cited by 7 publications

References 0 publications

A 2D dynamic model for the impact of time-dependent low-mode drive asymmetries on the shell asymmetries during acceleration phases of ICF implosions

A 2D dynamic model for the impact of time-dependent low-mode drive asymmetries on the shell asymmetries during acceleration phases of ICF implosions

Investigating the hohlraum radiation properties through the angular distribution of the radiation temperature

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

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