Mechanical Design and Analysis of an Indirect-drive Cryogenic Target

Hong, Youwei; Du, Kai; Lei, Hongwei; Qi, Xin; Jiang, Baibin; Zhang, Haijun; Wu, Wei; Zhang, Jicheng; Wang, Kai; Lin, Wei; Yin, Qiang; Gao, Yuan; Wei, Sheng; Xie, Ju; Gao, Shasha; Ren, Wei; Li, Yanzhong; Luo, Huaihua; Jiang, Zhen

doi:10.1007/s10894-016-0091-0

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…A simple cylindrical cryogenic target is designed, and assembled from elsewhere [14], as shown in figure 1, the capsule and solid ice are visualized by backlit shadowgraph (perpendicular direction) and by x-ray phase contrast imaging (horizontal direction). Continuous x-ray phase contrast imaging of the deuterium layer is achieved without stopping the cryocooler based on the two-stage thermal shielding and flexible connection method.…”

Section: Experiments and Inferencesmentioning

confidence: 99%

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

Tao¹,

Wu²,

Dai³

et al. 2022

Nucl. Fusion

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We report results of crystal growth, layering of the deuterium-deuterium (D2) layers in cylindrical cryogenic targets. For the first time, we realized the global coverage of the D2 layer on the inner surface of the capsule through the crystal growth of D2 ice, and the control of the temperature field without the infrared radiation, foam lining, and magnetic field. Analysis of the image of X-ray phase contrast imaging shows that the thickness of the D2 layer is about 36.53 μm, and the inner surface roughness is 3.23 μm. The finite element method is applied to simulate the temperature field of the target, and the phase transition process of D2, revealing the mechanism of D2 covering the inner surface of the capsule. These initial experiments provide a new vision and method for exploring and achieving the pure crystal growth as well as layering of D2 without operation of radioactive tritium.

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Section: Experiments and Inferencesmentioning

confidence: 99%

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

Tao¹,

Wu²,

Dai³

et al. 2022

Nucl. Fusion

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“…In general, the non-hydrogen gas content inside the capsule should be lower than 205 ppm, and the non-helium gas content inside the hohlraum should be lower than 8250 ppm [9]. Currently, the impurity gases are mainly removed from the capsule and hohlraum by sub-atmospheric purging, i.e., evacuation and filling cycles, through microcapillaries that are only tens of microns in diameter [10][11][12][13]. Since the capsule and hohlraum volumes are too small to take measurements in situ, accurately predicting the flow characteristics inside the microtubes and the chambers is critical for the purging of the target.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Optimization of Sub-Atmospheric Purging through Microcapillaries in an ICF Cryogenic Target

Li,

Yin,

et al. 2024

Processes

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In inertial confinement fusion, the sub-atmospheric purging through microcapillaries is of great importance to the high gas purity inside the cryogenic target and the low failure rate of experiments. In this study, a non-continuous flow model is developed for this sub-atmospheric purging process and verified through National Ignition Facility experiments to study the evolution of parameters such as pressure and gas composition that are not possible to measure directly. The effects of microcapillary structures and sizes on the transient evacuation–filling behaviors are analyzed, and the periodic purging scheme is optimized. The results show that the extension of evacuation and filling time caused by the elongated microtube can be described as a linear function of microtube length or an exponential decay function of microtube diameter, and the change of the inner diameter has a more drastic effect. The conical-straight composite can effectively reduce the evacuation and filling time while meeting the thermal and mechanical requirements. The overall performance of the purging process exhibits a strong dependence on the cycle trough pressure. The total purging time firstly decreases and then increases with the increase in the trough pressure, and the optimal trough pressure falls at around 20% of the filling pressure where the evacuation and filling times are almost evenly balanced. These results can provide theoretical guidance for the selection of microtubes and the design of the filling–evacuating scheme in the experiments.

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Analysis of growing characteristics of fuel layer in ICF cryogenic target

Guo

2022

Cryogenics

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Mechanical Design and Analysis of an Indirect-drive Cryogenic Target

Cited by 7 publications

References 18 publications

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

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

Performance Analysis and Optimization of Sub-Atmospheric Purging through Microcapillaries in an ICF Cryogenic Target

Analysis of growing characteristics of fuel layer in ICF cryogenic target

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