Hannover 2020 – scientific programme
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P: Fachverband Plasmaphysik
P 14: Codes and modelling
P 14.4: Talk
Wednesday, March 11, 2020, 14:55–15:10, b302
Molecular dynamics study of non-equilibrium dense plasmas with ionization potential depression — •Rui Jin1,2, Malik Muhammad Abdullah1,3,4, Zoltan Jurek1,3, Sang-Kil Son1,3, and Robin Santra1,3,4 — 1Center for Free-Electron Laser Science, DESY, Hamburg, Germany — 2Department of Physics and Astronomy, Shanghai Jiaotong University, Shanghai, China — 3The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 4Department of Physics, Universität Hamburg, Hamburg, Germany
High energy density matter exists extensively in the universe, from hot dense plasmas such as supernova and stellar interiors to warm dense matter such as planetary interiors. Creating and analyzing hot and warm dense plasmas under such extreme conditions in the laboratory is critical to understand their unique properties. The advent of x-ray free-electron laser (XFEL), which provides intense femtosecond pulses, enables us to quickly heat bulk materials, creating dense plasmas under non-local thermal equilibrium (NLTE). In the dense plasma, ionization potential depression (IPD) effect emergies, but theoretical IPD models have been considered at local thermal equilibrium. In this study, we employ XMDYN, a Monte-Carlo (MC) and molecular-dynamic (MD) -based computational tool, to simulate the dense materials interacting with intense XFEL pulses. In order to include the IPD for NLTE plasma environment, we propose a numerical method based on ab initio calculation of atomic energy shifts due to the micro-field obtained directly from MD simulations. We demonstrate the the IPD effects in MD simulations of solid-density aluminum plasma formation.