skip to main content

DOE PAGESDOE PAGES

Title: Quantitative Defect Analysis of Ablator Capsule Surfaces Using a Leica Confocal Microscope and a High-Density Atomic Force Microscope

High-density carbon (HDC) is being evaluated as an alternative to the current National Ignition Facility (NIF) point-design ablator material (glow discharge plasma, or GDP, plastic) due to its high density and optimal opacity, which leads to a higher implosion velocity. Chemical-vapor-deposition-coated HDC capsules have a near perfect surface figure but a microscopically rough surface. After polishing, the surface becomes smooth at nanometer scales but has numerous micron-sized surface pits, whose volumes, morphology, and distribution must be quantified to guide NIF target selection. Traditional metrology tools for GDP surface defects, such as the atomic force microscope (AFM) based Spheremapper and a phase-shifting differential interferometer, lack the resolution to characterize these localized features. In this paper, we describe how this metrology challenge is met by developing automated surface metrology solutions based on a high-density (HD) AFM and a Leica confocal microscope. Furthermore, these tools are complementary in nature. HD-AFM has a 0.1-μm spatial resolution and determines the overall shape distortion and pit statistics by tracing great circles on a capsule with high throughput.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3]
  1. General Atomics, San Diego, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Diamond Materials GmbH, Freiburg (Germany)
Publication Date:
Report Number(s):
LLNL-JRNL-745488
Journal ID: ISSN 1536-1055; 900599
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 70; Journal Issue: 2; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-density carbon; atomic force microscope; National Ignition Facility
OSTI Identifier:
1474351

Huang, H., Carlson, L. C., Requieron, W., Rice, N., Hoover, D., Farrell, M., Goodin, D., Nikroo, A., Biener, J., Stadernann, M., Haan, S. W., Ho, D., and Wild, C.. Quantitative Defect Analysis of Ablator Capsule Surfaces Using a Leica Confocal Microscope and a High-Density Atomic Force Microscope. United States: N. p., Web. doi:10.13182/FST15-220.
Huang, H., Carlson, L. C., Requieron, W., Rice, N., Hoover, D., Farrell, M., Goodin, D., Nikroo, A., Biener, J., Stadernann, M., Haan, S. W., Ho, D., & Wild, C.. Quantitative Defect Analysis of Ablator Capsule Surfaces Using a Leica Confocal Microscope and a High-Density Atomic Force Microscope. United States. doi:10.13182/FST15-220.
Huang, H., Carlson, L. C., Requieron, W., Rice, N., Hoover, D., Farrell, M., Goodin, D., Nikroo, A., Biener, J., Stadernann, M., Haan, S. W., Ho, D., and Wild, C.. 2017. "Quantitative Defect Analysis of Ablator Capsule Surfaces Using a Leica Confocal Microscope and a High-Density Atomic Force Microscope". United States. doi:10.13182/FST15-220. https://www.osti.gov/servlets/purl/1474351.
@article{osti_1474351,
title = {Quantitative Defect Analysis of Ablator Capsule Surfaces Using a Leica Confocal Microscope and a High-Density Atomic Force Microscope},
author = {Huang, H. and Carlson, L. C. and Requieron, W. and Rice, N. and Hoover, D. and Farrell, M. and Goodin, D. and Nikroo, A. and Biener, J. and Stadernann, M. and Haan, S. W. and Ho, D. and Wild, C.},
abstractNote = {High-density carbon (HDC) is being evaluated as an alternative to the current National Ignition Facility (NIF) point-design ablator material (glow discharge plasma, or GDP, plastic) due to its high density and optimal opacity, which leads to a higher implosion velocity. Chemical-vapor-deposition-coated HDC capsules have a near perfect surface figure but a microscopically rough surface. After polishing, the surface becomes smooth at nanometer scales but has numerous micron-sized surface pits, whose volumes, morphology, and distribution must be quantified to guide NIF target selection. Traditional metrology tools for GDP surface defects, such as the atomic force microscope (AFM) based Spheremapper and a phase-shifting differential interferometer, lack the resolution to characterize these localized features. In this paper, we describe how this metrology challenge is met by developing automated surface metrology solutions based on a high-density (HD) AFM and a Leica confocal microscope. Furthermore, these tools are complementary in nature. HD-AFM has a 0.1-μm spatial resolution and determines the overall shape distortion and pit statistics by tracing great circles on a capsule with high throughput.},
doi = {10.13182/FST15-220},
journal = {Fusion Science and Technology},
number = 2,
volume = 70,
place = {United States},
year = {2017},
month = {5}
}