Spatially and temporally resolved measurements of a dense copper plasma heated by intense relativistic electrons

Coleman, Joshua Eugene; Colgan, James Patrick

doi:10.1063/1.4989797

Title: Spatially and temporally resolved measurements of a dense copper plasma heated by intense relativistic electrons

Journal Article · Fri Aug 25 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4989797· OSTI ID:1467263

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

A 100-μm-thick Cu foil is isochorically heated by a ~100-ns-long electron bunch with an energy of 19.8 MeV and current of 1.7 kA to T_e > 1 eV. After 100 ns of heating and 20 ns of expansion, the plasma exhibits a stable, quiescent temperature and density distribution for >200 ns. Several intense Cu-I emission lines are observed after ~20 J of electron beam energy is deposited. These lines have well known Stark widths providing a direct measurement of n_e. The Los Alamos ATOMIC code [Magee et al., AIP Conf. Proc. 2004, 168–179 and Hakel et al., J. Quant. Spectrosc. Radiat. Transfer 99, 265 (2006)] was run in local-thermodynamic-equilibrium mode to estimate T_e and n_e. Spatially and temporally resolved measurements are then presented in both the vertical and horizontal directions adjacent to the foil indicating temperatures >1 eV and densities ranging from 1–3 × 10¹⁷ cm^-3 after expansion and cooling.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1467263

Alternate ID(s):: OSTI ID: 1376974

Report Number(s):: LA-UR-17-24434

Journal Information:: Physics of Plasmas, Vol. 24, 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: 7 works

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