Development of broadband x-ray radiography for diagnosing magnetically driven cylindrically compressed matter

Sawada, H.; Daykin, T. S.; Hutchinson, T. M.; Bauer, B. S.; Ivanov, V. V.; Beg, F. N.; Chen, H.; Williams, G. J.; McLean, H. S.

doi:10.1063/1.5100173

Title: Development of broadband x-ray radiography for diagnosing magnetically driven cylindrically compressed matter

Journal Article · 07 August 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5100173 · OSTI ID:1569178

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^[1]; Hutchinson, T. M. ^[1]; Bauer, B. S. ^[1];

^[1]; Beg, F. N. ^[2]; Chen, H. ^[3];

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Univ. of Nevada Reno, Reno, NV (United States)
Univ. of California San Diego, La Jolla, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Experiments and modeling of x-ray radiography of millimeter diameter solid Al wires with laser-produced broadband x rays are reported. Experiments were performed using the 50-TW Leopard short-pulse laser in a laser and pulsed power chamber at the Nevada Terawatt Facility. To characterize broadband x rays and demonstrate a radiographic capability, bremsstrahlung, escaping electrons, and radiograph images of Al wires were simultaneously measured. The angularly resolved x-ray spectra are modeled by comparing measured bremsstrahlung signals in the range between 10 and ~500 keV with hybrid particle-in-cell simulations. Transmission of Al wires from the radiograph images is further simulated with a Monte Carlo code. The measured transmission profiles of Al wires with three different diameters agree with calculations when a simulated x-ray spectrum composed of line emissions and bremsstrahlung is used with a source size of 600 ± 200 μm. Transmission calculations with only 22 keV Ag Kα or an exponential x-ray spectrum do not reproduce the measurement, suggesting that the accurate determination of an x-ray source spectrum, as well as the inclusion of the photon sensitivity of the detector, is critical in transmission calculations to infer the density of an object. As a result, the laser-based broadband x-ray radiography that was developed has been successfully implemented in a pulsed power chamber for future laser-pulsed-power coupled experiments.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: AC52-07NA27344; 1707357; FG-02-05ER54834

OSTI ID:: 1569178

Alternate ID(s):: OSTI ID: 1547666

Report Number(s):: LLNL-JRNL-792340; LLNL-JRNL-782061; 991687; TRN: US2100257

Journal Information:: Physics of Plasmas, Vol. 26, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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