Decomposable Mandrel Project. Progress report

Letts, S.A.; Fearon, E. M.; Allison, Leslie M.; Buckley, Steven R.; Saculla, M. D.; Cook, R.C.M.

doi:10.2172/85915

Cited by 3 publications

(2 citation statements)

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“…As an important method for fabricating inertial confinement fusion (ICF) targets, the degradable mandrel technique is the basis of preparing glow discharge polymer (GDP) microspheres [1][2][3][4] . It can be divided into three steps [2,3] : first, hollow polymer microspheres are prepared as mandrels; then, plasma vapour deposition technology is used to prepare a coating with higher thermal stability on the surface; and, finally, the coated mandrels are degraded leaving hollow microspheres.…”

Section: Introductionmentioning

confidence: 99%

Mandrel degradation model of combined fast and slow processes

Zhu

Liang

et al. 2021

High Pow Laser Sci Eng

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In this paper, we report the study of degradation for a kind of ideal mandrel material called poly-α-methylstyrene based on theoretical and experimental methods. First-principles calculations reveal two types of process: depolymerization and hydrogen-transfer-induced chain scission. The energy barrier for the former (0.68–0.82 eV) is smaller than that for most of the latter (1.39–4.23 eV). More importantly, reaction rates suggest that the former is fast whereas the latter is mostly slow, which can result in a difference of 5–31 orders of magnitude at 550 K. Furthermore, a thermogravimetric experiment shows that the activation energy of 2.53 eV for degradation is between those of fast and slow processes, corresponding to the theoretical average value of multiple reaction paths. Thus, a mandrel degradation model combining fast and slow processes is established at the atomic level. Our work provides a direction for research into the key technology of target fabrication in inertial confinement fusion.

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Section: Introductionmentioning

confidence: 99%

Mandrel degradation model of combined fast and slow processes

Zhu

Liang

et al. 2021

High Pow Laser Sci Eng

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“…With gentle heating of the bath, the organic solvent of the non-aqueous "oil" shell dissipates (diffuses) into the aqueous bath (host) leaving a solid polymer shell with an aqueous core that can later be air dried to remove the 'water'. Bead variants on this approach avoid the aqueous core (Czechowicz and Stephens, 1998) or directly attempt to sphericalize solid PahO beads through a melt phase (Letts et al, 1998). The key to success in all of these approaches is to minimize perturbations to the shell or bead sphericity.…”

Section: Introductionmentioning

confidence: 99%

Some Aspects of the Hydrodynamics of the Microencapsulation Route to NIF Mandrels

Gresho

1999

Fusion Technology

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Spherical plastic shells for use as mandrels for the fabrication of ICF (Inertial Confinement Fusion) target capsules can be produced by solution-based microencapsulation techniques. The specifications for these mandrels in terms of sphericity are extremely rigorous, and it is clear that various aspects of the solution hydrodynamics associated with their production are important in controlling the quality of the final product. This paper explores what we know (and need to know) about the hydrodynamics of the microencapsulation process in order to lay the foundation for process improvements as well as identify inherent limits.

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Quantum tunneling of hydrogen atom transfer affects mandrel degradation in inertial confinement fusion target fabrication

Zhu

Yang

et al. 2022

iScience

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Summary Poly-α-methylstyrene (PAMS) is considered as the preferred mandrel material, whose degradation is crucial for the fabrication of high-quality inertial confinement fusion (ICF) targets. Herein, we reveal that hydrogen atom transfer (HAT) during PAMS degradation, which is usually attributed to the thermal effect, unexpectedly exhibits a strong high-temperature tunneling effect. Specifically, although the energy barrier of the HAT reaction is only 10 −2 magnitude different from depolymerization, the tunneling probability of the former can be 14–32 orders of magnitude greater than that of the latter. Furthermore, chain scission following HAT will lead to a variety of products other than monomers. Our work highlights that quantum tunneling may be an important source of uncertainty in PAMS degradation, which will provide a direction for the further development of key technology of target fabricating in ICF research and even the solution of plastic pollution.

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Decomposable Mandrel Project. Progress report

Cited by 3 publications

References 0 publications

Mandrel degradation model of combined fast and slow processes

Mandrel degradation model of combined fast and slow processes

Some Aspects of the Hydrodynamics of the Microencapsulation Route to NIF Mandrels

Quantum tunneling of hydrogen atom transfer affects mandrel degradation in inertial confinement fusion target fabrication

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