Bremsstrahlung x-ray generation for high optical depth radiography applications on the National Ignition Facility [Bremsstrahlung x-ray generation for opacity radiography applications on the National Ignition Facility]
Abstract
Here, we have tested a set of x-ray sources for use as probes of highly attenuating, laser-driven experiments on the National Ignition Facility (NIF). Unlike traditional x-ray sources that optimize for a characteristic atomic transition (often the n = 2 → n = 1 transition in ionized, He-like atoms), the design presented here maximizes the total photon flux by optimizing for intense, broadband Bremsstrahlung radiation. Three experiments were performed with identical targets, including a uranium x-ray source foil and a tungsten substrate with a narrow (25 μm wide) collimating slit to produce a quasi-1D x-ray source. Two experiments were performed using 12 beams from the NIF laser, each delivering approximately 46 kJ of laser energy but with different laser spatial profiles. This pair yielded similar temporal x-ray emission profiles, spatial resolution, and inferred hot electron temperature. A third experiment with only 6 beams delivering approximately 25 kJ produced a lower hot electron temperature and significantly lower x-ray flux, as well as poorer spatial resolution. The data suggest that laser pointing jitter may have affected the location and intensity of the emitting plasma, producing an emission volume that was not well centered behind the collimating slit and lower intensity than designed.more »
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1479065
- Alternate Identifier(s):
- OSTI ID: 1477213
- Report Number(s):
- LLNL-JRNL-750922
Journal ID: ISSN 0034-6748; 936604
- 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:
- 47 OTHER INSTRUMENTATION
Citation Formats
Huntington, C. M., McNaney, J. M., Gumbrell, E., Krygier, A., Wehrenberg, C., and Park, H. -S. Bremsstrahlung x-ray generation for high optical depth radiography applications on the National Ignition Facility [Bremsstrahlung x-ray generation for opacity radiography applications on the National Ignition Facility]. United States: N. p., 2018.
Web. doi:10.1063/1.5039379.
Huntington, C. M., McNaney, J. M., Gumbrell, E., Krygier, A., Wehrenberg, C., & Park, H. -S. Bremsstrahlung x-ray generation for high optical depth radiography applications on the National Ignition Facility [Bremsstrahlung x-ray generation for opacity radiography applications on the National Ignition Facility]. United States. https://doi.org/10.1063/1.5039379
Huntington, C. M., McNaney, J. M., Gumbrell, E., Krygier, A., Wehrenberg, C., and Park, H. -S. Fri .
"Bremsstrahlung x-ray generation for high optical depth radiography applications on the National Ignition Facility [Bremsstrahlung x-ray generation for opacity radiography applications on the National Ignition Facility]". United States. https://doi.org/10.1063/1.5039379. https://www.osti.gov/servlets/purl/1479065.
@article{osti_1479065,
title = {Bremsstrahlung x-ray generation for high optical depth radiography applications on the National Ignition Facility [Bremsstrahlung x-ray generation for opacity radiography applications on the National Ignition Facility]},
author = {Huntington, C. M. and McNaney, J. M. and Gumbrell, E. and Krygier, A. and Wehrenberg, C. and Park, H. -S.},
abstractNote = {Here, we have tested a set of x-ray sources for use as probes of highly attenuating, laser-driven experiments on the National Ignition Facility (NIF). Unlike traditional x-ray sources that optimize for a characteristic atomic transition (often the n = 2 → n = 1 transition in ionized, He-like atoms), the design presented here maximizes the total photon flux by optimizing for intense, broadband Bremsstrahlung radiation. Three experiments were performed with identical targets, including a uranium x-ray source foil and a tungsten substrate with a narrow (25 μm wide) collimating slit to produce a quasi-1D x-ray source. Two experiments were performed using 12 beams from the NIF laser, each delivering approximately 46 kJ of laser energy but with different laser spatial profiles. This pair yielded similar temporal x-ray emission profiles, spatial resolution, and inferred hot electron temperature. A third experiment with only 6 beams delivering approximately 25 kJ produced a lower hot electron temperature and significantly lower x-ray flux, as well as poorer spatial resolution. The data suggest that laser pointing jitter may have affected the location and intensity of the emitting plasma, producing an emission volume that was not well centered behind the collimating slit and lower intensity than designed. However, the 12-beam design permits x-ray radiography through highly attenuating samples, where lower energy line-emission x-ray sources would be nearly completely attenuated.},
doi = {10.1063/1.5039379},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Fri Oct 12 00:00:00 EDT 2018},
month = {Fri Oct 12 00:00:00 EDT 2018}
}
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Cited by: 7 works
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Figures / Tables:
FIG. 1: Backlighter target: Lasers irradiate the uranium foil, which is mounted on a thin substrate of plastic (CH). A 400 $μ$m thick tungsten block with a ∼25 × 300 $μ$m laser-machined slot serves to collimate the x-rays into a quasi-1D line source. The tungsten is backed by a second,more »
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Works referenced in this record:
X-ray area backlighter development at the National Ignition Facility (invited)
journal, November 2014
- Barrios, M. A.; Regan, S. P.; Fournier, K. B.
- Review of Scientific Instruments, Vol. 85, Issue 11
Development of a Big Area BackLighter for high energy density experiments
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An evaluation of high energy bremsstrahlung background in point-projection x-ray radiography experiments
journal, October 2012
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Mitigation of hard x-ray background in backlit pinhole imagers
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Investigating iron material strength up to 1 Mbar using Rayleigh-Taylor growth measurements
conference, January 2017
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- SHOCK COMPRESSION OF CONDENSED MATTER - 2015: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, AIP Conference Proceedings
Strong stabilization of the Rayleigh–Taylor instability by material strength at megabar pressures
journal, May 2010
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conference, September 2013
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journal, April 2015
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Study of silver Kα and bremsstrahlung radiation from short-pulse laser-matter interactions with applications for x-ray radiography
journal, August 2010
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Backlighter development at the National Ignition Facility (NIF): Zinc to zirconium
journal, September 2013
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- High Energy Density Physics, Vol. 9, Issue 3
A study of picosecond laser–solid interactions up to 10 19 W cm −2
journal, February 1997
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- Physics of Plasmas, Vol. 4, Issue 2
Characterization of the x-ray sensitivity of a streak camera used at the National Ignition Facility (NIF)
conference, September 2013
- Khan, S. F.; Lee, J. J.; Izumi, N.
- SPIE Optical Engineering + Applications, SPIE Proceedings
High-resolution 22–52 keV backlighter sources and application to X-ray radiography
journal, September 2013
- Vaughan, K.; Moore, A. S.; Smalyuk, V.
- High Energy Density Physics, Vol. 9, Issue 3
High-energy x-ray backlighter spectrum measurements using calibrated image plates
journal, February 2011
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- Review of Scientific Instruments, Vol. 82, Issue 2
Development of intense point x-ray sources for backlighting high energy density experiments (invited)
journal, October 2004
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K α and bremsstrahlung x-ray radiation backlighter sources from short pulse laser driven silver targets as a function of laser pre-pulse energy
journal, March 2014
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- Physics of Plasmas, Vol. 21, Issue 3
Experimental results of tantalum material strength at high pressure and high strain rate
conference, January 2012
- Park, Hye-Sook; Barton, Nathan; Belof, Jonathan L.
- SHOCK COMPRESSION OF CONDENSED MATTER - 2011: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, AIP Conference Proceedings
Characterizing the modulation transfer function for X-ray radiography in high energy density experiments
journal, October 2018
- Gumbrell, E.; McNaney, J. M.; Huntington, C. M.
- Review of Scientific Instruments, Vol. 89, Issue 10
Tailored ramp-loading via shock release of stepped-density reservoirs
journal, May 2012
- Prisbrey, Shon T.; Park, Hye-Sook; Remington, Bruce A.
- Physics of Plasmas, Vol. 19, Issue 5
Development of a short duration backlit pinhole for radiography on the National Ignition Facility
journal, October 2010
- Huntington, C. M.; Krauland, C. M.; Kuranz, C. C.
- Review of Scientific Instruments, Vol. 81, Issue 10
Works referencing / citing this record:
Characterizing the modulation transfer function for X-ray radiography in high energy density experiments
journal, October 2018
- Gumbrell, E.; McNaney, J. M.; Huntington, C. M.
- Review of Scientific Instruments, Vol. 89, Issue 10
The response function of Fujifilm BAS-TR imaging plates to laser-accelerated titanium ions
journal, August 2019
- Strehlow, J.; Forestier-Colleoni, P.; McGuffey, C.
- Review of Scientific Instruments, Vol. 90, Issue 8
Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.