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Title: Capsule Shimming Developments for National Ignition Facility (NIF) Hohlraum Asymmetry Experiments

Abstract

Capsule drive in National Ignition Facility (NIF) indirect drive implosions is generated by x-ray illumination from cylindrical hohlraums. The cylindrical hohlraum geometry is axially symmetric but not spherically symmetric causing capsule-fuel drive asymmetries. We hypothesize that fabricating capsules asymmetric in wall thickness (shimmed) may compensate for drive asymmetries and improve implosion symmetry. Simulations suggest that for high compression implosions Legendre mode P 4 hohlraum flux asymmetries are the most detrimental to implosion performance. General Atomics has developed a diamond turning method to form a GDP capsule outer surface to a Legendre mode P 4 profile. The P 4 shape requires full capsule surface coverage. Thus, in order to avoid tool-lathe interference flipping the capsule part way through the machining process is required. This flipping process risks misalignment of the capsule causing a vertical step feature on the capsule surface. Recent trials have proven this step feature height can be minimized to ~0.25 µm.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2]
+ Show Author Affiliations
  1. General Atomics, San Diego, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1402460
Alternate Identifier(s):
OSTI ID: 1458701
Report Number(s):
LLNL-JRNL-736455
Journal ID: ISSN 1536-1055
Grant/Contract Number:  
NA0001808; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 73; Journal Issue: 2; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Hohlraum; National Ignition Facility; capsule shimming

Citation Formats

Rice, Neal G., Vu, M., Kong, C., Mauldin, M., Tambazidis, A., Hoppe Jr, M., Fitzsimmons, P., Farrell, Michael, Clark, D., Dewald, E., and Smalyuk, V. Capsule Shimming Developments for National Ignition Facility (NIF) Hohlraum Asymmetry Experiments. United States: N. p., 2017. Web. doi:10.1080/15361055.2017.1389603.
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Rice, Neal G., Vu, M., Kong, C., Mauldin, M., Tambazidis, A., Hoppe Jr, M., Fitzsimmons, P., Farrell, Michael, Clark, D., Dewald, E., & Smalyuk, V. Capsule Shimming Developments for National Ignition Facility (NIF) Hohlraum Asymmetry Experiments. United States. doi:10.1080/15361055.2017.1389603.
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Rice, Neal G., Vu, M., Kong, C., Mauldin, M., Tambazidis, A., Hoppe Jr, M., Fitzsimmons, P., Farrell, Michael, Clark, D., Dewald, E., and Smalyuk, V. Wed . "Capsule Shimming Developments for National Ignition Facility (NIF) Hohlraum Asymmetry Experiments". United States. doi:10.1080/15361055.2017.1389603. https://www.osti.gov/servlets/purl/1402460.
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@article{osti_1402460,
title = {Capsule Shimming Developments for National Ignition Facility (NIF) Hohlraum Asymmetry Experiments},
author = {Rice, Neal G. and Vu, M. and Kong, C. and Mauldin, M. and Tambazidis, A. and Hoppe Jr, M. and Fitzsimmons, P. and Farrell, Michael and Clark, D. and Dewald, E. and Smalyuk, V.},
abstractNote = {Capsule drive in National Ignition Facility (NIF) indirect drive implosions is generated by x-ray illumination from cylindrical hohlraums. The cylindrical hohlraum geometry is axially symmetric but not spherically symmetric causing capsule-fuel drive asymmetries. We hypothesize that fabricating capsules asymmetric in wall thickness (shimmed) may compensate for drive asymmetries and improve implosion symmetry. Simulations suggest that for high compression implosions Legendre mode P4 hohlraum flux asymmetries are the most detrimental to implosion performance. General Atomics has developed a diamond turning method to form a GDP capsule outer surface to a Legendre mode P4 profile. The P4 shape requires full capsule surface coverage. Thus, in order to avoid tool-lathe interference flipping the capsule part way through the machining process is required. This flipping process risks misalignment of the capsule causing a vertical step feature on the capsule surface. Recent trials have proven this step feature height can be minimized to ~0.25 µm.},
doi = {10.1080/15361055.2017.1389603},
journal = {Fusion Science and Technology},
number = 2,
volume = 73,
place = {United States},
year = {2017},
month = {12}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI:  10.1080/15361055.2017.1389603
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Cited by: 2 works
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Figures / Tables:

Fig. 1 Fig. 1: Modeled implosion comparison using no shim vs. 3 µm shim.
All figures and tables (5 total)
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Works referenced in this record:

Machining of Two-Dimensional Sinusoidal Defects on Ignition-Type Capsules to Study Hydrodynamic Instability at the National Ignition Facility
journal, September 2016

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Effects of fuel-capsule shimming and drive asymmetry on inertial-confinement-fusion symmetry and yield
journal, March 2016

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Mitigating the impact of hohlraum asymmetries in National Ignition Facility implosions using capsule shims
journal, July 2016

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  • Physics of Plasmas, Vol. 23, Issue 7
  • DOI: 10.1063/1.4958812

Polishing and local planarization of plastic spherical capsules using tumble finishing
journal, November 2012

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    Figures / Tables found in this record:

    Fig. 1(p. 4)figure
    Fig. 2(p. 5)figure
    Fig. 3(p. 6)figure
    Fig. 4(p. 9)figure
    Fig. 5(p. 11)figure
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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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