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Title: Resolving hot spot microstructure using x-ray penumbral imaging (invited)

Abstract

Here, we have developed and fielded x-ray penumbral imaging on the National Ignition Facility in order to enable sub-10 μm resolution imaging of stagnated plasma cores (hot spots) of spherically shock compressed spheres and shell implosion targets. By utilizing circular tungsten and tantalum apertures with diameters ranging from 20 μm to 2 mm, in combination with image plate and gated x-ray detectors as well as imaging magnifications ranging from 4 to 64, we have demonstrated high-resolution imaging of hot spot plasmas at x-ray energies above 5 keV. Here we give an overview of the experimental design criteria involved and demonstrate the most relevant influences on the reconstruction of x-ray penumbral images, as well as mitigation strategies of image degrading effects like over-exposed pixels, artifacts, and photon limited source emission. We describe experimental results showing the advantages of x-ray penumbral imaging over conventional Fraunhofer and photon limited pinhole imaging and showcase how internal hot spot microstructures can be resolved.

Authors:
 [1];  [2];  [1];  [1]; ORCiD logo [2];  [1];  [1];  [2];  [1];  [1];  [2];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1466905
Report Number(s):
LLNL-JRNL-745745
Journal ID: ISSN 0034-6748; RSINAK; 930316
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Bachmann, B., Hilsabeck, T., Field, J., Masters, N., Reed, C., Pardini, T., Rygg, J. R., Alexander, N., Benedetti, L. R., Döppner, T., Forsman, A., Izumi, N., LePape, S., Ma, T., MacPhee, A. G., Nagel, S., Patel, P., Spears, B., and Landen, O. L. Resolving hot spot microstructure using x-ray penumbral imaging (invited). United States: N. p., 2016. Web. doi:10.1063/1.4959161.
Bachmann, B., Hilsabeck, T., Field, J., Masters, N., Reed, C., Pardini, T., Rygg, J. R., Alexander, N., Benedetti, L. R., Döppner, T., Forsman, A., Izumi, N., LePape, S., Ma, T., MacPhee, A. G., Nagel, S., Patel, P., Spears, B., & Landen, O. L. Resolving hot spot microstructure using x-ray penumbral imaging (invited). United States. doi:10.1063/1.4959161.
Bachmann, B., Hilsabeck, T., Field, J., Masters, N., Reed, C., Pardini, T., Rygg, J. R., Alexander, N., Benedetti, L. R., Döppner, T., Forsman, A., Izumi, N., LePape, S., Ma, T., MacPhee, A. G., Nagel, S., Patel, P., Spears, B., and Landen, O. L. Fri . "Resolving hot spot microstructure using x-ray penumbral imaging (invited)". United States. doi:10.1063/1.4959161. https://www.osti.gov/servlets/purl/1466905.
@article{osti_1466905,
title = {Resolving hot spot microstructure using x-ray penumbral imaging (invited)},
author = {Bachmann, B. and Hilsabeck, T. and Field, J. and Masters, N. and Reed, C. and Pardini, T. and Rygg, J. R. and Alexander, N. and Benedetti, L. R. and Döppner, T. and Forsman, A. and Izumi, N. and LePape, S. and Ma, T. and MacPhee, A. G. and Nagel, S. and Patel, P. and Spears, B. and Landen, O. L.},
abstractNote = {Here, we have developed and fielded x-ray penumbral imaging on the National Ignition Facility in order to enable sub-10 μm resolution imaging of stagnated plasma cores (hot spots) of spherically shock compressed spheres and shell implosion targets. By utilizing circular tungsten and tantalum apertures with diameters ranging from 20 μm to 2 mm, in combination with image plate and gated x-ray detectors as well as imaging magnifications ranging from 4 to 64, we have demonstrated high-resolution imaging of hot spot plasmas at x-ray energies above 5 keV. Here we give an overview of the experimental design criteria involved and demonstrate the most relevant influences on the reconstruction of x-ray penumbral images, as well as mitigation strategies of image degrading effects like over-exposed pixels, artifacts, and photon limited source emission. We describe experimental results showing the advantages of x-ray penumbral imaging over conventional Fraunhofer and photon limited pinhole imaging and showcase how internal hot spot microstructures can be resolved.},
doi = {10.1063/1.4959161},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {Fri Aug 05 00:00:00 EDT 2016},
month = {Fri Aug 05 00:00:00 EDT 2016}
}

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Works referenced in this record:

X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92
journal, July 1993

  • Henke, B. L.; Gullikson, E. M.; Davis, J. C.
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Novel x‐ray imaging methods at the Nova laser facility (invited)
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