@article{Crilly:2023:10.1016/j.hedp.2023.101053,
author = {Crilly, AJ and Niasse, NPL and Fraser, AR and Chapman, DA and McLean, KW and Rose, SJ and Chittenden, JP},
doi = {10.1016/j.hedp.2023.101053},
journal = {High Energy Density Physics},
pages = {1--12},
title = {SpK: A fast atomic and microphysics code for the high-energy-density regime},
url = {http://dx.doi.org/10.1016/j.hedp.2023.101053},
volume = {48},
year = {2023}
}

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TY  - JOUR
AB  - SpK is part of the numerical codebase at Imperial College London used to model high energy density physics (HEDP) experiments. SpK is an efficient atomic and microphysics code used to perform detailed configuration accounting calculations of electronic and ionic stage populations, opacities and emissivities for use in post-processing and radiation hydrodynamics simulations. This is done using screened hydrogenic atomic data supplemented by the NIST energy level database. An extended Saha model solves for chemical equilibrium with extensions for non-ideal physics, such as ionisation potential depression, and non thermal equilibrium corrections. A tree-heap (treap) data structure is used to store spectral data, such as opacity, which is dynamic thus allowing easy insertion of points around spectral lines without a-priori knowledge of the ion stage populations. Results from SpK are compared to other codes and descriptions of radiation transport solutions which use SpK data are given. The treap data structure and SpK’s computational efficiency allows inline post-processing of 3D hydrodynamics simulations with a dynamically evolving spectrum stored in a treap.
AU  - Crilly,AJ
AU  - Niasse,NPL
AU  - Fraser,AR
AU  - Chapman,DA
AU  - McLean,KW
AU  - Rose,SJ
AU  - Chittenden,JP
DO  - 10.1016/j.hedp.2023.101053
EP  - 12
PY  - 2023///
SN  - 1574-1818
SP  - 1
TI  - SpK: A fast atomic and microphysics code for the high-energy-density regime
T2  - High Energy Density Physics
UR  - http://dx.doi.org/10.1016/j.hedp.2023.101053
UR  - http://hdl.handle.net/10044/1/104963
VL  - 48
ER  - 

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