Study on the growth and redistribution of deuterium–deuterium layer driven by temperature gradient

Tao, Chaoyou; Wu, kewei; Dai, Fei; He, Z. Y.; Yang, Hong; Lin, Wei; Wang, Kai; Zhang, Hui

doi:10.1088/1741-4326/ac652c

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…The capsules are further cooled below the deuterium solidification temperature when the amounts of the liquid fuel inside the capsules meet the design requirements. Following specific procedures of temperature control [21,22], it is found that a uniform D-ice layer can survive for a few minutes inside the capsule. We repeated the procedures of D-ice layering fourteen times for a single target, and by characterizing the ice layer quality with phase contrast imaging (figure 2), we found that there was a 72% chance that the amplitude of mode 1 was less than 2.8 µm, and the RMS of the power spectrum in modes 2-100 was 2.2 µm in average.…”

Section: Methodsmentioning

confidence: 99%

Demonstration of indirectly driven implosion experiments with cryogenic pure deuterium layered capsules on the Shenguang Laser Facility

Wang

et al. 2023

Nucl. Fusion

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To achieve ignition in a laboratory via inertial confinement fusion, a spherical capsule containing a frozen layer of deuterium and tritium (DT) fuel will be imploded on an MJ-class laser facility. However, if pure deuterium fuel can be used in place of DT fuel for tuning shots, we may speed up the process of ignition experiments while maintaining the surrogacy by significantly reducing the level of radioactivity. Unfortunately, it has long been assumed that neither the approach of symmetrical infrared irradiation used in the Omega direct-drive experiments nor the method of beta-layering used in the NIF experiments can be used to smooth the D layered capsule in cylindrical hohlraums. The difficulty in smoothing the D ice layer prevents us from taking advantage of cryogenic D-layered capsules in indirect-drive experiments. In this work, we established a procedure to form a uniform D-ice layer for capsules held in cylindrical hohlraums and carried out indirect-drive cryogenic D-layered implosion experiments using a squared laser pulse on the Shenguang laser facility in China. The quality of the D ice layer is characterized by phase-contrast imaging. The root-mean-square of the power spectrum in modes 2-100 is about 2.2μm. The implosion performance of the D-layered capsules is close to the prediction of one-dimensional simulations. The measured neutron yield and areal fuel density are 1.2×1011 and 80mg/cm2, respectively.

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Section: Methodsmentioning

confidence: 99%

Demonstration of indirectly driven implosion experiments with cryogenic pure deuterium layered capsules on the Shenguang Laser Facility

Wang

et al. 2023

Nucl. Fusion

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Achieving global thermal uniformity of a compact cylindrical deuterium-tritium target

Yang,

Liang,

Dai

et al. 2024

Fusion Engineering and Design

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Study on the morphology of liquid–gas interface inside inertial confinement fusion target under the condition of temperature gradient based on Young–Laplace equation

Yao

Zhang

2023

Physics of Fluids

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This study investigates the morphology of the liquid–gas interface inside inertial confinement fusion targets with temperature gradients from the perspective of force balance. The effects of contact angle, liquid volume, temperature gradient, and target size on the interface morphology are discussed. The filling of the fuel and the preparation of the ice layer inside the target are carried out near the deuterium–deuterium triple point at 18.71 K, accompanied by temperature gradient distributions of different magnitudes. The morphology of the liquid–gas interface has a significant impact on the subsequent laser experiments. The differential equation for calculating the morphology of the liquid–gas interface under non-uniform temperature field is derived based on the Young–Laplace equation. In order to verify the accuracy and applicability of the model as well as to provide guidance for practical applications such as process optimization, experimental data within a temperature gradient range of 0.69–1.38 K/cm during the fuel filling process were selected. Image processing techniques, including denoising and edge detection, were applied to the experimental images. The obtained structured data were compared with the numerical solutions of the equation for the liquid–gas interface morphology. The accuracy of the equation was verified by the results. Based on this, the morphology of the liquid–gas interface of deuterium–deuterium inside targets under different experimental conditions was calculated. It was found that a smaller target radius, higher filling temperature, smaller contact angle, and larger temperature gradient are more conducive to subsequent experiments.

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Study on the growth and redistribution of deuterium–deuterium layer driven by temperature gradient

Cited by 3 publications

References 25 publications

Demonstration of indirectly driven implosion experiments with cryogenic pure deuterium layered capsules on the Shenguang Laser Facility

Demonstration of indirectly driven implosion experiments with cryogenic pure deuterium layered capsules on the Shenguang Laser Facility

Achieving global thermal uniformity of a compact cylindrical deuterium-tritium target

Study on the morphology of liquid–gas interface inside inertial confinement fusion target under the condition of temperature gradient based on Young–Laplace equation

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