Parameterizing hot electron energy distributions for tabular emissivities and opacities

Walton, T.; Sebald, J. L.; Golovkin, I. E.; MacFarlane, J. J.; Golovkina, V. N.; Solodov, A. A.; Nilson, P. M.; Epstein, R.

doi:10.1016/j.hedp.2019.100730

Title: Parameterizing hot electron energy distributions for tabular emissivities and opacities

Journal Article · Sat Nov 02 00:00:00 EDT 2019 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2019.100730· OSTI ID:1593393

Walton, T. ^[1]; Sebald, J. L. ^[1]; Golovkin, I. E. ^[1]; MacFarlane, J. J. ^[1]; Golovkina, V. N. ^[1]; Solodov, A. A. ^[2]; Nilson, P. M. ^[2]; Epstein, R. ^[2]

Prism Computational Sciences, Madison, WI (United States)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Cold Kα and Kβ emission spectroscopy is a powerful diagnostic for plasma conditions and distributions of energetic electrons produced in short pulse laser experiments. SPECT3D post-processes hydrodynamics code output and simulates high-resolution spectra and images for plasmas containing arbitrary distributions of hot electrons, however these calculations can become prohibitively expensive for plasmas requiring complex atomic data and detailed computational grids. To significantly increase calculation speed, it is desirable to use pre-configured opacity tables that include information about hot electrons, rather than calculating emissivity and opacity for every grid point by solving collisional-radiative atomic kinetic rate equations. However, to tabulate such opacities, a general parameter-based description of hot electron energy distributions must be found. To be practical, hot electrons should be represented with an analytic function of just a few parameters which, in addition to temperature and density, can be used to define parameter space for opacity tables. In this paper, we present a method that allows for describing a set of arbitrary binned hot electron distributions with a simple analytic function, with only a modest impact on the accuracy of the simulations. Increased calculation speeds of 50–100x are demonstrated. In conclusion, we also discuss details of opacity calculations and present synthetic spectroscopy data based on post-processing of detailed particle-in-cell simulations relevant to the ongoing experimental campaign at the Omega EP laser facility.

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Research Organization:: Prism Computational Sciences, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0018105

OSTI ID:: 1593393

Alternate ID(s):: OSTI ID: 1574530

Journal Information:: High Energy Density Physics, Vol. 35, Issue C; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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74 ATOMIC AND MOLECULAR PHYSICS
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Title: Parameterizing hot electron energy distributions for tabular emissivities and opacities

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