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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]
  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.
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. doi:10.1063/1.5038753.
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. doi:10.1063/1.5038753. https://www.osti.gov/servlets/purl/1479072.
@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 = {2018},
month = {10}
}

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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:

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.