Study of pure and mixed clustered noble gas puffs irradiated with a high intensity (7 × 1019 W/cm2) sub-ps laser beam and achievement of a strong X-ray flash in a laser-generated debris-free X-ray source

Schultz, K. A.; Kantsyrev, V. L.; Safronova, A. S.; Shlyaptseva, V. V.; Petkov, E. E.; Shrestha, I. K.; Cooper, M. C.; Petrov, G. M.; Stafford, A.; Butcher, C. J.; Kemp, G. E.; Park, J.; Fournier, K. B.

doi:10.1017/S0263034619000521

Title: Study of pure and mixed clustered noble gas puffs irradiated with a high intensity (7 × 10¹⁹ W/cm²) sub-ps laser beam and achievement of a strong X-ray flash in a laser-generated debris-free X-ray source

Journal Article · 22 July 2019 · Laser and Particle Beams

DOI: https://doi.org/10.1017/S0263034619000521 · OSTI ID:1557744

^[1]; Kantsyrev, V. L. ^[1]; Safronova, A. S. ^[1]; Shlyaptseva, V. V. ^[1];

^[1]; Shrestha, I. K. ^[1]; Cooper, M. C. ^[1]; Petrov, G. M. ^[2]; Stafford, A. ^[1]; Butcher, C. J. ^[1]; Kemp, G. E. ^[3];

^[3]; Fournier, K. B. ^[3]

Univ. of Nevada, Reno, NV (United States)
Naval Research Lab. (NRL), Washington, DC (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Abstract We present a broad study of linear, clustered, noble gas puffs irradiated with the frequency doubled (527 nm) Titan laser at Lawrence Livermore National Laboratory. Pure Ar, Kr, and Xe clustered gas puffs, as well as two mixed-gas puffs consisting of KrAr and XeKrAr gases, make up the targets. Characterization experiments to determine gas-puff density show that varying the experimental parameter gas-delay timing (the delay between gas puff initialization and laser-gas-puff interaction) provides a simple control over the gas-puff density. X-ray emission (>1.4 keV) is studied as a function of gas composition, density, and delay timing. Xe gas puffs produce the strongest peak radiation in the several keV spectral region. The emitted radiation was found to be anisotropic, with smaller X-ray flux observed in the direction perpendicular to both laser beam propagation and polarization directions. The degree of anisotropy is independent of gas target type but increases with photon energy. X-ray spectroscopic measurements estimate plasma parameters and highlight their difference with previous studies. Electron beams with energy in excess of 72 keV are present in the noble gas-puff plasmas and results indicate that Ar plays a key role in their production. A drastic increase in harder X-ray emissions (X-ray flash effect) and multi-MeV electron-beam generation from Xe gas-puff plasma occurred when the laser beam was focused on the front edge of the linear gas puff.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: 89233218CNA000001; NA0003877; AC52-07NA27344

OSTI ID:: 1557744

Alternate ID(s):: OSTI ID: 1559924

Report Number(s):: LA-UR-18-20663; LLNL-JRNL-744010; applab

Journal Information:: Laser and Particle Beams, Vol. 37, Issue 3; ISSN 0263-0346

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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