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Title: Fabrication of special inertial confinement fusion targets using a depolymerizable mandrel technique

Abstract

A technique was developed for fabricating spherical shell targets for implosion physics experiments with diameters up to several millimeters and with unique structural features such as thin metal layers or texture on the inside surface. We start with a spherical bead or thin shell of poly(alpha-methylstyrene) (PAMS) of the desired size, which can be textured by laser photoablation or overcoated with a thin layer of diagnostic material. The mandrel is next overcoated with plasma polymer (CH) 2{endash}50 {mu}m thick. Upon heating, the PAMS depolymerizes to a gaseous monomer which diffuses through the thermally stable plasma polymer coating leaving a hollow shell. Shells produced by this technique are uniform in wall thickness, and highly spherical. If the PAMS mandrel is textured, the mandrel topology is transferred to the inner wall of the plasma polymer shell. Likewise, thermally stable coatings on the mandrel are transferred to the inner shell wall. {copyright} {ital 1996 American Vacuum Society}

Authors:
; ; ;  [1]
  1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
284655
Report Number(s):
CONF-9510385-
Journal ID: JVTAD6; ISSN 0734-2101; TRN: 96:020352
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology, A
Additional Journal Information:
Journal Volume: 14; Journal Issue: 3; Conference: 42. national symposium of the American Vacuum Society, Mineapolis, MI (United States), 16-20 Oct 1995; Other Information: PBD: May 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; ICF DEVICES; THERMONUCLEAR FUELS; FABRICATION; SURFACE COATING; TARGETS; POLYMERS

Citation Formats

Letts, S A, Fearon, E M, Allison, L M, and Cook, R. Fabrication of special inertial confinement fusion targets using a depolymerizable mandrel technique. United States: N. p., 1996. Web. doi:10.1116/1.580124.
Letts, S A, Fearon, E M, Allison, L M, & Cook, R. Fabrication of special inertial confinement fusion targets using a depolymerizable mandrel technique. United States. https://doi.org/10.1116/1.580124
Letts, S A, Fearon, E M, Allison, L M, and Cook, R. Wed . "Fabrication of special inertial confinement fusion targets using a depolymerizable mandrel technique". United States. https://doi.org/10.1116/1.580124.
@article{osti_284655,
title = {Fabrication of special inertial confinement fusion targets using a depolymerizable mandrel technique},
author = {Letts, S A and Fearon, E M and Allison, L M and Cook, R},
abstractNote = {A technique was developed for fabricating spherical shell targets for implosion physics experiments with diameters up to several millimeters and with unique structural features such as thin metal layers or texture on the inside surface. We start with a spherical bead or thin shell of poly(alpha-methylstyrene) (PAMS) of the desired size, which can be textured by laser photoablation or overcoated with a thin layer of diagnostic material. The mandrel is next overcoated with plasma polymer (CH) 2{endash}50 {mu}m thick. Upon heating, the PAMS depolymerizes to a gaseous monomer which diffuses through the thermally stable plasma polymer coating leaving a hollow shell. Shells produced by this technique are uniform in wall thickness, and highly spherical. If the PAMS mandrel is textured, the mandrel topology is transferred to the inner wall of the plasma polymer shell. Likewise, thermally stable coatings on the mandrel are transferred to the inner shell wall. {copyright} {ital 1996 American Vacuum Society}},
doi = {10.1116/1.580124},
url = {https://www.osti.gov/biblio/284655}, journal = {Journal of Vacuum Science and Technology, A},
number = 3,
volume = 14,
place = {United States},
year = {1996},
month = {5}
}