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Title: Method for foam encapsulating laser targets

Abstract

Foam encapsulated laser fusion targets are made by positioning a fusion fuel-filled sphere within a mold cavity of suitable configuration and dimensions, and then filling the cavity with a material capable of producing a low density, microcellular foam, such as cellulose acetate dissolved in an acetone-based solvent. The mold assembly is dipped into an ice water bath to gel the material and thereafter soaked in the water bath to leach out undesired components, after which the gel is frozen, then freeze-dried wherein water and solvents sublime and the gel structure solidifies into a low-density microcellular foam, thereafter the resulting foam encapsulated target is removed from the mold cavity. The fuel-filled sphere is surrounded by foam having a thickness of about 10 to 100 .mu.m, a cell size of less than 2 .mu.m, and density of 0.065 to 0.6 .times. 10.sup.3 kg/m.sup.3. Various configured foam-encapsulated targets capable of being made by this encapsulation method are illustrated.

Inventors:
 [1]
  1. Livermore, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
862881
Patent Number(s):
4034032
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
C - CHEMISTRY C08 - ORGANIC MACROMOLECULAR COMPOUNDS C08J - WORKING-UP
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; foam; encapsulating; laser; targets; encapsulated; fusion; positioning; fuel-filled; sphere; mold; cavity; suitable; configuration; dimensions; filling; material; capable; producing; density; microcellular; cellulose; acetate; dissolved; acetone-based; solvent; assembly; dipped; ice; water; bath; thereafter; soaked; leach; undesired; components; frozen; freeze-dried; solvents; sublime; structure; solidifies; low-density; resulting; target; removed; surrounded; thickness; 10; 100; cell; size; 065; times; kg; various; configured; foam-encapsulated; encapsulation; illustrated; water bath; low-density microcellular; mold assembly; density microcellular; fusion targets; cell size; laser fusion; cellulose acetate; laser targets; material capable; microcellular foam; fusion target; suitable configuration; acetone-based solvent; mold cavity; solvents sublime; structure solidifies; fusion fuel; desired component; foam encapsulated; laser target; ice water; encapsulation method; cellular foam; /264/106/376/428/

Citation Formats

Hendricks, Charles D. Method for foam encapsulating laser targets. United States: N. p., 1977. Web.
Hendricks, Charles D. Method for foam encapsulating laser targets. United States.
Hendricks, Charles D. Sat . "Method for foam encapsulating laser targets". United States. https://www.osti.gov/servlets/purl/862881.
@article{osti_862881,
title = {Method for foam encapsulating laser targets},
author = {Hendricks, Charles D},
abstractNote = {Foam encapsulated laser fusion targets are made by positioning a fusion fuel-filled sphere within a mold cavity of suitable configuration and dimensions, and then filling the cavity with a material capable of producing a low density, microcellular foam, such as cellulose acetate dissolved in an acetone-based solvent. The mold assembly is dipped into an ice water bath to gel the material and thereafter soaked in the water bath to leach out undesired components, after which the gel is frozen, then freeze-dried wherein water and solvents sublime and the gel structure solidifies into a low-density microcellular foam, thereafter the resulting foam encapsulated target is removed from the mold cavity. The fuel-filled sphere is surrounded by foam having a thickness of about 10 to 100 .mu.m, a cell size of less than 2 .mu.m, and density of 0.065 to 0.6 .times. 10.sup.3 kg/m.sup.3. Various configured foam-encapsulated targets capable of being made by this encapsulation method are illustrated.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {1}
}

Patent:

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