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Title: Supercritical Drying of Wet Gel Layers Generated Inside ICF Ablator Shells

Abstract

Spherical ablator shells that contain a thin layer of ultralow-density polymer foam have recently attracted attention in the inertial confinement fusion (ICF) community as they can be used to bring dopants for diagnostics and nuclear physics experiments in direct contact with the deuterium-tritium (DT) fuel or to study new ignition regimes by enabling the formation of uniform liquid DT fuel layers. We developed a method to fabricate these foam-lined ablator shells using a prefabricated ablator as a mold to cast the foam liner within the shell. One crucial component of this new approach is the removal of solvent from the ablator shells without collapsing the ultralow-density porous polymer network. In this work, we report on a supercritical drying approach with liquid carbon dioxide that provides critical information on how to produce thin layers of low-density polymer foams in ablator shells for ICF experiments. Diffusion experiments were used to study the time required for complete solvent exchange in 2-mm-inner-diameter diamond shells and the data were used to demonstrate the fabrication of uniform porous polymer films inside ablator shells.

Authors:
 [1];  [1];  [1];  [1];  [1]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1467819
Report Number(s):
LLNL-JRNL-735742
Journal ID: ISSN 1536-1055; 887862
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 73; Journal Issue: 2; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 36 MATERIALS SCIENCE; Polymer films; hollow sphere; supercritical drying

Citation Formats

Braun, Tom, Kim, Sung Ho, Biener, Monika M., Hamza, Alex V., and Biener, Juergen. Supercritical Drying of Wet Gel Layers Generated Inside ICF Ablator Shells. United States: N. p., 2017. Web. doi:10.1080/15361055.2017.1392203.
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Braun, Tom, Kim, Sung Ho, Biener, Monika M., Hamza, Alex V., & Biener, Juergen. Supercritical Drying of Wet Gel Layers Generated Inside ICF Ablator Shells. United States. https://doi.org/10.1080/15361055.2017.1392203
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Braun, Tom, Kim, Sung Ho, Biener, Monika M., Hamza, Alex V., and Biener, Juergen. Tue . "Supercritical Drying of Wet Gel Layers Generated Inside ICF Ablator Shells". United States. https://doi.org/10.1080/15361055.2017.1392203. https://www.osti.gov/servlets/purl/1467819.
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@article{osti_1467819,
title = {Supercritical Drying of Wet Gel Layers Generated Inside ICF Ablator Shells},
author = {Braun, Tom and Kim, Sung Ho and Biener, Monika M. and Hamza, Alex V. and Biener, Juergen},
abstractNote = {Spherical ablator shells that contain a thin layer of ultralow-density polymer foam have recently attracted attention in the inertial confinement fusion (ICF) community as they can be used to bring dopants for diagnostics and nuclear physics experiments in direct contact with the deuterium-tritium (DT) fuel or to study new ignition regimes by enabling the formation of uniform liquid DT fuel layers. We developed a method to fabricate these foam-lined ablator shells using a prefabricated ablator as a mold to cast the foam liner within the shell. One crucial component of this new approach is the removal of solvent from the ablator shells without collapsing the ultralow-density porous polymer network. In this work, we report on a supercritical drying approach with liquid carbon dioxide that provides critical information on how to produce thin layers of low-density polymer foams in ablator shells for ICF experiments. Diffusion experiments were used to study the time required for complete solvent exchange in 2-mm-inner-diameter diamond shells and the data were used to demonstrate the fabrication of uniform porous polymer films inside ablator shells.},
doi = {10.1080/15361055.2017.1392203},
journal = {Fusion Science and Technology},
number = 2,
volume = 73,
place = {United States},
year = {Tue Dec 19 00:00:00 EST 2017},
month = {Tue Dec 19 00:00:00 EST 2017}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1080/15361055.2017.1392203
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Cited by: 4 works
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Figures / Tables:

Figure 1 Figure 1: Schematic fabrication process of foam-lined ICF targets: a) filling a prefabricated hollow ablator shell; b) formation of a smooth and uniform gel layer by deterministic rotation; c) removing the solvent by supercritical drying.
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    Works referencing / citing this record:

    Variable convergence liquid layer implosions on the National Ignition Facility
    journal, May 2018

    • Zylstra, A. B.; Yi, S. A.; Haines, B. M.
    • Physics of Plasmas, Vol. 25, Issue 5
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    • Physics of Plasmas, Vol. 26, Issue 1
    • DOI: 10.1063/1.5080262
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