Preparation of germanium doped plasma polymerized coatings as ICF target ablators

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Targets for Inertial Confinement Fusion (ICF) experiments at the Lawrence Livermore National Laboratory (LLNL) utilize an organic (CH) ablator coating prepared by plasma polymerization. Some of these experiments require a mid-Z dopant in the ablator coating to modify the opacity of the shell. Bromine had been used in the past, but the surface finish of brominated CH degrades rapidly with time upon exposure to air. This paper describes the preparation and characterization of plasma polymer layers containing germanium as a dopant at concentrations of between 1.25 and 2.25 atom percent. The coatings are stable in air and have an rms ... continued below

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14 p.

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Brusasco, R.M.; Saculla, M.D. & Cook, R.C. October 5, 1994.

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Description

Targets for Inertial Confinement Fusion (ICF) experiments at the Lawrence Livermore National Laboratory (LLNL) utilize an organic (CH) ablator coating prepared by plasma polymerization. Some of these experiments require a mid-Z dopant in the ablator coating to modify the opacity of the shell. Bromine had been used in the past, but the surface finish of brominated CH degrades rapidly with time upon exposure to air. This paper describes the preparation and characterization of plasma polymer layers containing germanium as a dopant at concentrations of between 1.25 and 2.25 atom percent. The coatings are stable in air and have an rms surface roughness of 7--9 nm (modes 10--1,000) which is similar to that obtained with undoped coatings. High levels of dopant result in cracking of the inner mandrel during target assembly. Possible explanations for the observed cracking behavior will be discussed.

Physical Description

14 p.

Notes

INIS; OSTI as DE95012470

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  • 41. annual American Vacuum Society symposium, Denver, CO (United States), 24-28 Oct 1994

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  • Other: DE95012470
  • Report No.: UCRL-JC--117325
  • Report No.: CONF-941001--15
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/72999 | External Link
  • Office of Scientific & Technical Information Report Number: 72999
  • Archival Resource Key: ark:/67531/metadc707877

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  • October 5, 1994

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 17, 2016, 3:36 p.m.

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Brusasco, R.M.; Saculla, M.D. & Cook, R.C. Preparation of germanium doped plasma polymerized coatings as ICF target ablators, report, October 5, 1994; California. (digital.library.unt.edu/ark:/67531/metadc707877/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.