Characterization of fast electron divergence and energy spectrum from modeling of angularly resolved bremsstrahlung measurements

Daykin, T. S.; Sawada, H.; Sentoku, Y.; Beg, F. N.; Chen, H.; McLean, H. S.; Link, A. J.; Patel, P. K.; Ping, Y.

doi:10.1063/1.5055257

Title: Characterization of fast electron divergence and energy spectrum from modeling of angularly resolved bremsstrahlung measurements

Journal Article · Tue Dec 11 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5055257· OSTI ID:1513300

^[1];

^[2]; Beg, F. N. ^[3]; Chen, H. ^[4];

^[4]; Link, A. J. ^[4]; Patel, P. K. ^[4]; Ping, Y. ^[4]

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

Characteristics of fast electrons generated in an intense laser-solid target interaction are studied by modeling angularly resolved bremsstrahlung measurements with a hybrid Particle-In-Cell code, Large Scale Plasmas. The experiment was enacted using the 50 TW Leopard laser at the Nevada Terawatt Facility. A 100 μm thick Cu foil was irradiated by the 15 J, 0.35 ps laser at a peak laser intensity of 2 × 10¹⁹ W/cm². Bremsstrahlung produced by transport and recirculation of the fast electrons in the foil was measured with two differential filter-stack x-ray spectrometers at 22° and 40° from the laser axis. The two-spectrometer signals simultaneously fit by varying single slope temperatures (T_hot) and divergence angles (θ) enable for determining T_hot and θ to be 1.1 ± 0.3 MeV and 15° ± 8°, respectively. The T_hot inferred from the bremsstrahlung signals agrees with that from an escaped electron measurement, implying that that the bremsstrahlung is predominantly produced by the transport of the high energy fast electrons in the first pass.

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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:: 1513300

Report Number(s):: LLNL-JRNL-768897; 949312

Journal Information:: Physics of Plasmas, Vol. 25, Issue 12; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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