Characterizing the modulation transfer function for X-ray radiography in high energy density experiments
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- E. Gumbrell
- A.W.E. 1 , Aldermaston, Reading RG7 4PR, United Kingdom
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- J. M. McNaney
- Lawrence Livermore National Laboratory 2 , 7000 East Ave., Livermore, California 94550, USA
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- C. M. Huntington
- Lawrence Livermore National Laboratory 2 , 7000 East Ave., Livermore, California 94550, USA
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- A. G. Krygier
- Lawrence Livermore National Laboratory 2 , 7000 East Ave., Livermore, California 94550, USA
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- H.-S. Park
- Lawrence Livermore National Laboratory 2 , 7000 East Ave., Livermore, California 94550, USA
抄録
<jats:p>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.</jats:p>
収録刊行物
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- Review of Scientific Instruments
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Review of Scientific Instruments 89 (10), 10G118-, 2018-10-01
AIP Publishing