Solidification of an atomic fluid inside a spherical shell

Lei, Hongwei; Bi, Peng; Yi, Yong; Wang, Kai; Lin, Wei

doi:10.1088/0029-5515/55/6/063033

Cited by 4 publications

(1 citation statement)

References 27 publications

(38 reference statements)

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“…It can be applied as the target engineering design criterion. As for the high modulus roughness of ice shell, microcosmic algorithms such as molecular dynamics (MD) and Monte Carlo (MC) are necessary [52][53][54].…”

Section: Discussionmentioning

confidence: 99%

Predicting spherical symmetry degeneration of non-infrared deuterium ice layer in a cryogenic capsule

et al. 2020

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A cylindrical cryogenic target containing deuterium fuel acts as an important surrogate to help understand implosion physics before the deuterium-tritium capability is brought online. Uniformity of the deuterium ice thickness is a key parameter for the inertial confinement fusion (ICF) experiments. Achieving and retaining a uniform deuterium ice layer in capsule without infrared radiation is difficult in engineering. The method used to calculate the ice thickness deviation of deuterium-tritium fuel is invalid when the bulk heat generation is equal to zero. Appearance solutions of the deuterium ice in steady state conclude that a uniform ice layer cannot be retained for long without infrared radiation. A transient algorithm by integrating heat transfer theory, the equation derived from Stefan problem and mass conservation with moving mesh technics in a finite element model can be applied to predict deuterium ice spherical symmetry degeneration. It is certified with good reliability by comparing the simulated results with theoretical and experimental data. As for the deuterium targets, the characteristics of linear approximation and integrability avert heavy work of moving mesh in analyses of stable and unstable scenarios. The work has great support for the cryogenic processing and engineering design of ICF targets.

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Section: Discussionmentioning

confidence: 99%

Predicting spherical symmetry degeneration of non-infrared deuterium ice layer in a cryogenic capsule

et al. 2020

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Design of the removable shrouds for inertial-confinement-fusion cryotargets

Dai

Wang

Lin

et al. 2023

Fusion Engineering and Design

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Surface-initiated phase transition in solid hydrogen under the high-pressure compression

Lei

Lin

Wang

et al. 2018

Applied Physics Letters

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The large-scale molecular dynamics simulations have been performed to understand the microscopic mechanism governing the phase transition of solid hydrogen under the high-pressure compression. These results demonstrate that the face-centered-cubic-to-hexagonal close-packed phase transition is initiated first at the surfaces at a much lower pressure than in the volume and then extends gradually from the surface to volume in the solid hydrogen. The infrared spectra from the surface are revealed to exhibit a different pressure-dependent feature from those of the volume during the high-pressure compression. It is thus deduced that the weakening intramolecular H-H bonds are always accompanied by hardening surface phonons through strengthening the intermolecular H2-H2 coupling at the surfaces with respect to the counterparts in the volume at high pressures. This is just opposite to the conventional atomic crystals, in which the surface phonons are softening. The high-pressure compression has further been predicted to force the atoms or molecules to spray out of surface to degrade the pressure. These results provide a glimpse of structural properties of solid hydrogen at the early stage during the high-pressure compression.

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Solidification of an atomic fluid inside a spherical shell

Cited by 4 publications

References 27 publications

Predicting spherical symmetry degeneration of non-infrared deuterium ice layer in a cryogenic capsule

Predicting spherical symmetry degeneration of non-infrared deuterium ice layer in a cryogenic capsule

Design of the removable shrouds for inertial-confinement-fusion cryotargets

Surface-initiated phase transition in solid hydrogen under the high-pressure compression

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