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]

Huntington, C. M.; McNaney, J. M.; Gumbrell, E.; Krygier, A.; Wehrenberg, C.; Park, H. -S.

doi:10.1063/1.5039379

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]

Journal Article · Fri Oct 12 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5039379· OSTI ID:1479065

^[1]; McNaney, J. M. ^[1]; Gumbrell, E. ^[1];

^[1]; Wehrenberg, C. ^[1]; Park, H. -S. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1479065

Alternate ID(s):: OSTI ID: 1477213

Report Number(s):: LLNL-JRNL-750922; 936604

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 10; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 7 works

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Cited By (2)

Characterizing the modulation transfer function for X-ray radiography in high energy density experiments Gumbrell, E.; McNaney, J. M.; Huntington, C. M. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038753	journal	October 2018
The response function of Fujifilm BAS-TR imaging plates to laser-accelerated titanium ions Strehlow, J.; Forestier-Colleoni, P.; McGuffey, C. Review of Scientific Instruments, Vol. 90, Issue 8 https://doi.org/10.1063/1.5109783	journal	August 2019

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