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Title: Fabrication and Properties of Overcoated Resorcinol-Formaldehyde Shells for OMEGA Experiments

Abstract

New high gain designs for direct drive ignition on NIF require foam shells. Scaled down versions of these designs are needed for near term experiments on the OMEGA laser facility at the Laboratory Laser Energetics (LLE). These shells need to be about 1 mm in diameter and 50-100 {mu}m wall thickness and densities of 100-250 mg/cc. In addition, a full density permeation seal needs to be deposited for retention of the fill gas at room temperature or the ice at cryogenic temperatures. We have fabricated such shells using Resorcinolformaldehyde (R/F) as the selected foam material due to its transparency in the optical region. Extensive characterization of the wall uniformity of these shells has been performed. The foam shells have {approx}5%-6% nonconcentricities on the average. A full density permeation seal has been deposited on the R/F shells using two different techniques. In the first technique R/F shells are coated directly with plasma polymer to thicknesses of 3-4 {mu}m. In the second technique, R/F shells are coated with polyvinylphenol, using a chemical interfacial polymerization technique. Data on surface finish and gas retention for R/F shells coated by both methods are provided.

Authors:
 [1];  [1];  [1];  [1];  [2]
  1. General Atomics (United States)
  2. Lawrence Livermore National Laboratory (United States)
Publication Date:
OSTI Identifier:
20849611
Resource Type:
Journal Article
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 45; Journal Issue: 2; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1536-1055
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DESIGN; FABRICATION; FOAMS; FORMALDEHYDE; GAIN; ICE; ICF DEVICES; INERTIAL CONFINEMENT; LASER-PRODUCED PLASMA; OMEGA FACILITY; OPACITY; POLYMERIZATION; POLYMERS; RESORCINOL; RETENTION; THERMONUCLEAR IGNITION; THICKNESS; US NATIONAL IGNITION FACILITY

Citation Formats

Nikroo, A, Czechowicz, D, Paguio, R, Greenwood, A L, and Takagi, Masaru. Fabrication and Properties of Overcoated Resorcinol-Formaldehyde Shells for OMEGA Experiments. United States: N. p., 2004. Web.
Nikroo, A, Czechowicz, D, Paguio, R, Greenwood, A L, & Takagi, Masaru. Fabrication and Properties of Overcoated Resorcinol-Formaldehyde Shells for OMEGA Experiments. United States.
Nikroo, A, Czechowicz, D, Paguio, R, Greenwood, A L, and Takagi, Masaru. Mon . "Fabrication and Properties of Overcoated Resorcinol-Formaldehyde Shells for OMEGA Experiments". United States.
@article{osti_20849611,
title = {Fabrication and Properties of Overcoated Resorcinol-Formaldehyde Shells for OMEGA Experiments},
author = {Nikroo, A and Czechowicz, D and Paguio, R and Greenwood, A L and Takagi, Masaru},
abstractNote = {New high gain designs for direct drive ignition on NIF require foam shells. Scaled down versions of these designs are needed for near term experiments on the OMEGA laser facility at the Laboratory Laser Energetics (LLE). These shells need to be about 1 mm in diameter and 50-100 {mu}m wall thickness and densities of 100-250 mg/cc. In addition, a full density permeation seal needs to be deposited for retention of the fill gas at room temperature or the ice at cryogenic temperatures. We have fabricated such shells using Resorcinolformaldehyde (R/F) as the selected foam material due to its transparency in the optical region. Extensive characterization of the wall uniformity of these shells has been performed. The foam shells have {approx}5%-6% nonconcentricities on the average. A full density permeation seal has been deposited on the R/F shells using two different techniques. In the first technique R/F shells are coated directly with plasma polymer to thicknesses of 3-4 {mu}m. In the second technique, R/F shells are coated with polyvinylphenol, using a chemical interfacial polymerization technique. Data on surface finish and gas retention for R/F shells coated by both methods are provided.},
doi = {},
url = {https://www.osti.gov/biblio/20849611}, journal = {Fusion Science and Technology},
issn = {1536-1055},
number = 2,
volume = 45,
place = {United States},
year = {2004},
month = {3}
}