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

Abstract

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:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1474351
Report Number(s):
LLNL-JRNL-745488
Journal ID: ISSN 1536-1055; 900599
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: 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
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-density carbon; atomic force microscope; National Ignition Facility

Citation Formats

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., 2017. 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. Tue . "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},
issn = {1536-1055},
number = 2,
volume = 70,
place = {United States},
year = {2017},
month = {5}
}

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Works referenced in this record:

The effects of early time laser drive on hydrodynamic instability growth in National Ignition Facility implosions
journal, September 2014

  • Peterson, J. L.; Clark, D. S.; Masse, L. P.
  • Physics of Plasmas, Vol. 21, Issue 9
  • DOI: 10.1063/1.4896708

Point design targets, specifications, and requirements for the 2010 ignition campaign on the National Ignition Facility
journal, May 2011

  • Haan, S. W.; Lindl, J. D.; Callahan, D. A.
  • Physics of Plasmas, Vol. 18, Issue 5
  • DOI: 10.1063/1.3592169

Diamond spheres for inertial confinement fusion
journal, September 2009


The National Ignition Facility
journal, December 2004


3D Surface Reconstruction of ICF Shells after Full Surface Spheremapping
journal, May 2006

  • Huang, H.; Stephens, R. B.; Gibson, J. B.
  • Fusion Science and Technology, Vol. 49, Issue 4
  • DOI: 10.13182/FST49-642

Cryogenic tritium-hydrogen-deuterium and deuterium-tritium layer implosions with high density carbon ablators in near-vacuum hohlraums
journal, June 2015

  • Meezan, N. B.; Berzak Hopkins, L. F.; Le Pape, S.
  • Physics of Plasmas, Vol. 22, Issue 6
  • DOI: 10.1063/1.4921947

Capsule performance optimization in the National Ignition Campaign
journal, May 2010

  • Landen, O. L.; Boehly, T. R.; Bradley, D. K.
  • Physics of Plasmas, Vol. 17, Issue 5
  • DOI: 10.1063/1.3298882

Ignition on the National Ignition Facility
journal, May 2008


The experimental plan for cryogenic layered target implosions on the National Ignition Facility—The inertial confinement approach to fusion
journal, May 2011

  • Edwards, M. J.; Lindl, J. D.; Spears, B. K.
  • Physics of Plasmas, Vol. 18, Issue 5
  • DOI: 10.1063/1.3592173

High-density carbon ablator experiments on the National Ignition Facility
journal, May 2014

  • MacKinnon, A. J.; Meezan, N. B.; Ross, J. S.
  • Physics of Plasmas, Vol. 21, Issue 5
  • DOI: 10.1063/1.4876611

First implosion experiments with cryogenic thermonuclear fuel on the National Ignition Facility
journal, March 2012

  • Glenzer, Siegfried H.; Spears, Brian K.; Edwards, M. John
  • Plasma Physics and Controlled Fusion, Vol. 54, Issue 4
  • DOI: 10.1088/0741-3335/54/4/045013

Complete Surface Mapping of ICF Shells
journal, March 2004

  • Stephens, R. B.; Olson, D.; Huang, H.
  • Fusion Science and Technology, Vol. 45, Issue 2
  • DOI: 10.13182/FST45-210

Progress towards ignition on the National Ignition Facility
journal, August 2011


Increasing the Throughput of Phase-Shifting Diffraction Interferometer for Quantitative Characterization of ICF Ablator Capsule Surfaces
journal, May 2009

  • Lee, Y. T.; Nguyen, A. Q. L.; Huang, H.
  • Fusion Science and Technology, Vol. 55, Issue 4
  • DOI: 10.13182/FST09-28

Characterization of Isolated Defects for NIF Targets Using PSDI with an Analysis of Shell Flipping Capability
journal, May 2009

  • Nguyen, A. Q. L.; Eddinger, S. A.; Huang, H.
  • Fusion Science and Technology, Vol. 55, Issue 4
  • DOI: 10.13182/FST09-18