Study of the asymmetry of hot-spot self-emission imaging of inertial confinement fusion implosion driven by high-power laser facilities

Dong, Yunsong; Kang, Dongguo; Jiang, Wei; Liu, Zhicheng; Chen, Zhongjing; Zou, Xing; Li, Xin; Sun, Chuanxiang; Yin, Chen; Dong, Jianjun; Yang, Zhiwen; Pu, Yudong; Yan, Jiwang; Yu, Bo; Huang, Tianxuan; Miao, Wenyong; Dai, Zhensheng; Ge, Fengjun; Yang, Dong; Wang, Feng; Yang, Jiamin; Shao-En, Jiang

doi:10.1088/2058-6272/ab9804

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…Notably, researchers at Lawrence Livermore National Laboratory recently achieved 3.88 MJ of fusion energy using 2.05 MJ of laser energy [2], marking a 20% increase from the December 2022 shot that yielded 3.15 MJ of fusion energy [3]. The subsequent objective is to attain an even higher fusion yield, underscoring the critical importance of further enhancing the hohlraum performance and symmetry [4][5][6]. In the ICF hohlraum, plasma blowing off from the hohlraum wall influences the radiation symmetry.…”

Section: Introductionmentioning

confidence: 99%

Tamping the movement of the laser absorption cutoff position using gold foam hohlraum

ZHANG 张,

LI 李,

LIN 林

et al. 2024

Plasma Sci. Technol.

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In indirect-driven laser fusion experiments, the movement of the laser absorption layer will distort the radiation uniformity on the capsule. The gold foam has advantages in symmetry control and lowering wall plasma blowoff when used in an inertial confinement fusion (ICF) hohlraum. This work investigates the motion of the laser absorption cutoff position using low density foam gold walls. It is found that the motion of the laser absorption cutoff position can be significantly mitigated through optimal initial low density, tailored to a specific laser shape. For a short square laser pulse, the laser absorption cutoff position remains nearly stationary at an initial density of approximately 0.6 g cm−3. For a long-shaped laser pulse, the minimal motion of the laser absorption cutoff position is observed at an initial density of about 0.1 g cm−3. This approach allows for the adjustment of the symmetry of the hohlraum radiation source. The insights gained from this study serve as a crucial reference for optimizing hohlraum wall density.

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Section: Introductionmentioning

confidence: 99%

Tamping the movement of the laser absorption cutoff position using gold foam hohlraum

ZHANG 张,

LI 李,

LIN 林

et al. 2024

Plasma Sci. Technol.

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Diagnosis of the imploding shell asymmetry in polar-direct-drive deuterium–tritium cryogenic target implosions on OMEGA

Joshi

Shah

Theobald

et al. 2022

Review of Scientific Instruments

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We discuss the analyses of gated, x-ray imaging data from polar-direct-drive experiments with cryogenically layered deuterium–tritium targets on the OMEGA laser. The in-flight shell asymmetries were diagnosed at various times during the implosion, which was caused by the beam pointing geometry and preimposed variations in the energy partition between the different groups of laser beams. The shape of the ablation surface during the acceleration phase of the implosion was measured along two different lines of sight, and a Legendre mode ( ℓ-mode) decomposition was applied for modes of up to ten to investigate shell asymmetries. A clear causal relationship between the imposed beam imbalance and the shape of the in-flight shell asymmetries was observed. The imploded shell with a balanced energy ratio shows smaller values of the amplitudes of ℓ-mode 2 compared to that from implosions with an imbalanced ring energy ratio. The amplitudes of ℓ-modes 4 and 6 are the same within the measurement uncertainty with respect to the change in beam energy ratio.

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Monte Carlo study of X-ray grazing incidence microscopy using Geant4

Li,

Xu,

Yang

et al. 2023

Opt. Express

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X-ray grazing incidence microscopy has extensive applications in the fields of laser inertial confinement fusion and synchrotron radiation. Monte Carlo methods can be used to determine the optical performance of X-ray grazing incidence microscopes and predict the experimental results, which is of great significance for studying physical experiments and diagnostics. In this paper, we proposed a Monte Carlo method based on Geant4 for studying X-ray grazing incidence microscopy. We introduced the G4MultilayerReflection class to describe the physical processes of X-ray multilayer mirrors. We designed a dual-energy Kirkpatrick–Baez microscope that can operate at 6.4 and 9.67 keV simultaneously. Monte Carlo simulations of the spatial resolution and throughput efficiency of the microscope were performed using Geant4, which was assembled and characterized. The spatial resolution results obtained by the Geant4 laboratory simulations, the theoretical model, and the experiments were in good agreement. Additionally, we conducted throughput efficiency calibration experiments for the 6.4 keV imaging channel. The difference between the experimental and Geant4-simulated throughput efficiency was evaluated and resulted in root mean square error values of 8.7% and 9.5% along the Y- and Z-axes, respectively.

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Study of the asymmetry of hot-spot self-emission imaging of inertial confinement fusion implosion driven by high-power laser facilities

Cited by 3 publications

References 30 publications

Tamping the movement of the laser absorption cutoff position using gold foam hohlraum

Tamping the movement of the laser absorption cutoff position using gold foam hohlraum

Diagnosis of the imploding shell asymmetry in polar-direct-drive deuterium–tritium cryogenic target implosions on OMEGA

Monte Carlo study of X-ray grazing incidence microscopy using Geant4

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