Understanding reliability and some limitations of the images and spectra reconstructed from a multi-monochromatic x-ray imager
- Univ. of Nevada, Reno, NV (United States). Physics Dept.
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Las Palmas de Gran Canaria (Spain). Physics Dept.
Temperature and density asymmetry diagnosis is critical to advance inertial confinement fusion (ICF) science. A multi-monochromatic x-ray imager (MMI) is an attractive diagnostic for this purpose. The MMI records the spectral signature from an ICF implosion core with time resolution, 2-D space resolution, and spectral resolution. While narrow-band images and 2-D space-resolved spectra from the MMI data constrain temperature and density spatial structure of the core, the accuracy of the images and spectra depends not only on the quality of the MMI data but also on the reliability of the post-processing tools. In this paper, we synthetically quantify the accuracy of images and spectra reconstructed from MMI data. Errors in the reconstructed images are less than a few percent when the space-resolution effect is applied to the modeled images. The errors in the reconstructed 2-D space-resolved spectra are also less than a few percent except those for the peripheral regions. Spectra reconstructed for the peripheral regions have slightly but systematically lower intensities by ~6% due to the instrumental spatial-resolution effects. However, this does not alter the relative line ratios and widths and thus does not affect the temperature and density diagnostics. We also investigate the impact of the pinhole size variation on the extracted images and spectra. A 10% pinhole size variation could introduce spatial bias to the images and spectra of ~10%. A correction algorithm is developed, and it successfully reduces the errors to a few percent. Finally, it is desirable to perform similar synthetic investigations to fully understand the reliability and limitations of each MMI application.
- Research Organization:
- Univ. of Nevada, Reno, NV (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344; NA0000859; NA0002267
- OSTI ID:
- 1259768
- Alternate ID(s):
- OSTI ID: 1226395
- Report Number(s):
- LLNL-JRNL-688359
- Journal Information:
- Review of Scientific Instruments, Vol. 86, Issue 11; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy
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journal | March 2017 |
Progress on observations of interspecies ion separation in inertial-confinement-fusion implosions via imaging x-ray spectroscopy
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journal | June 2019 |
Impact of 3D effects on the characteristics of a multi-monochromatic x-ray imager
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journal | January 2019 |
| Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy | text | January 2017 |
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