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Title: Characterizing the modulation transfer function for X-ray radiography in high energy density experiments

Abstract

Here, the Modulation Transfer Function (MTF) is an established means for characterizing imaging performance of X-ray radiography systems. We report on experiments using high energy, laser-driven X-ray radiography systems that assess performance using MTF values measured with the knife-edge projection method. The broadband, hard X-ray systems under study use line-projection imaging produced by narrowing the laser-generated X-ray source with a slit. We find that good contrast resolution can be achieved (the MTF = 0.5 at 75 μm wavelength) and that this performance is reproduced on different laser facilities. We also find that the MTF is sensitive both to the thickness of the line-projection slit and to the backing material thickness under the knife-edge. Both these sensitivities are due to a common mechanism, namely induced changes in the spectrally-averaged spatial widths of the X-ray source. The same line-projection system is also used on experimental campaigns measuring Rayleigh-Taylor instability growth by dynamically imaging sinusoidal, high Z micro-targets with wavelengths of 100 μm or less. By applying the measured MTF values to correct the ripple target contrast measurements, we can predict ripple growth to approximately 10% accuracy.

Authors:
 [1];  [2]; ORCiD logo [2]; ORCiD logo [2];  [2]
+ Show Author Affiliations
  1. A.W.E., Reading (United Kingdom)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, 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:
1479072
Alternate Identifier(s):
OSTI ID: 1476837
Report Number(s):
LLNL-JRNL-750847
Journal ID: ISSN 0034-6748; 936508
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Lasers; 47 OTHER INSTRUMENTATION

Citation Formats

Gumbrell, Edward, McNaney, J. M., Huntington, C. M., Krygier, A. G., and Park, H. -S. Characterizing the modulation transfer function for X-ray radiography in high energy density experiments. United States: N. p., 2018. Web. doi:10.1063/1.5038753.
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Gumbrell, Edward, McNaney, J. M., Huntington, C. M., Krygier, A. G., & Park, H. -S. Characterizing the modulation transfer function for X-ray radiography in high energy density experiments. United States. https://doi.org/10.1063/1.5038753
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Gumbrell, Edward, McNaney, J. M., Huntington, C. M., Krygier, A. G., and Park, H. -S. Tue . "Characterizing the modulation transfer function for X-ray radiography in high energy density experiments". United States. https://doi.org/10.1063/1.5038753. https://www.osti.gov/servlets/purl/1479072.
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@article{osti_1479072,
title = {Characterizing the modulation transfer function for X-ray radiography in high energy density experiments},
author = {Gumbrell, Edward and McNaney, J. M. and Huntington, C. M. and Krygier, A. G. and Park, H. -S.},
abstractNote = {Here, the Modulation Transfer Function (MTF) is an established means for characterizing imaging performance of X-ray radiography systems. We report on experiments using high energy, laser-driven X-ray radiography systems that assess performance using MTF values measured with the knife-edge projection method. The broadband, hard X-ray systems under study use line-projection imaging produced by narrowing the laser-generated X-ray source with a slit. We find that good contrast resolution can be achieved (the MTF = 0.5 at 75 μm wavelength) and that this performance is reproduced on different laser facilities. We also find that the MTF is sensitive both to the thickness of the line-projection slit and to the backing material thickness under the knife-edge. Both these sensitivities are due to a common mechanism, namely induced changes in the spectrally-averaged spatial widths of the X-ray source. The same line-projection system is also used on experimental campaigns measuring Rayleigh-Taylor instability growth by dynamically imaging sinusoidal, high Z micro-targets with wavelengths of 100 μm or less. By applying the measured MTF values to correct the ripple target contrast measurements, we can predict ripple growth to approximately 10% accuracy.},
doi = {10.1063/1.5038753},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Tue Oct 09 00:00:00 EDT 2018},
month = {Tue Oct 09 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5038753
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Cited by: 7 works
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Figures / Tables:

FIG. 1 FIG. 1: The NIF experiment measuring RT instability growth. The optical axis, x, runs through the pressure reservoir and the driven physics package (object plane) to the detector (image plane). The inset is a transmission radiograph of driven Ta ripples inside the physics package.
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Works referenced in this record:

Developing a bright 17 keV x-ray source for probing high-energy-density states of matter at high spatial resolution
journal, April 2015

  • Huntington, C. M.; Park, H. -S.; Maddox, B. R.
  • Physics of Plasmas, Vol. 22, Issue 4
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Grain-Size-Independent Plastic Flow at Ultrahigh Pressures and Strain Rates
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X-ray induced pinhole closure in point-projection x-ray radiography
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Calculation of Axial Polychromatic Optical Transfer Function
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  • Barnden, R.
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  • DOI: 10.1080/713818864

Strong stabilization of the Rayleigh–Taylor instability by material strength at megabar pressures
journal, May 2010

  • Park, Hye-Sook; Remington, B. A.; Becker, R. C.
  • Physics of Plasmas, Vol. 17, Issue 5
  • DOI: 10.1063/1.3363170

Determination of the modulation transfer function using the edge method: Influence of scattered radiation: Scatter influence on MTF determination
journal, November 2004

  • Neitzel, Ulrich; Buhr, Egbert; Hilgers, Gerhard
  • Medical Physics, Vol. 31, Issue 12
  • DOI: 10.1118/1.1813872

Bremsstrahlung x-ray generation for high optical depth radiography applications on the National Ignition Facility
journal, October 2018

  • Huntington, C. M.; McNaney, J. M.; Gumbrell, E.
  • Review of Scientific Instruments, Vol. 89, Issue 10
  • DOI: 10.1063/1.5039379
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    Works referencing / citing this record:

    Bremsstrahlung x-ray generation for high optical depth radiography applications on the National Ignition Facility
    journal, October 2018

    • Huntington, C. M.; McNaney, J. M.; Gumbrell, E.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5039379
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      Figures / Tables found in this record:

      FIG. 1 (p. 4)figure
      FIG. 2 (p. 4)figure
      FIG. 3. (p. 5)figure
      FIG. 4 (p. 5)figure
      FIG. 5 (p. 5)figure
      FIG. 6 (p. 6)figure
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