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P: Fachverband Plasmaphysik
P 11: Codes and Modelling
P 11.6: Talk
Wednesday, March 30, 2022, 15:15–15:30, P-H11
Atomic Physics for Transient Relativistic Plasmas — •Brian Edward Marre1,2, Sergei Bastrakov1, Axel Huebl3, Marco Garten1,2, Pawel Ordyna1,2, Rene Widera1, Michael Bussmann4, Ulrich Schramm1, and Thomas Kluge1 — 1Helmholtz Zentrum Dresden-Rossendorf — 2TU Dresden — 3Lawrence Berkley National Laboratory — 4Center for Advanced Systems Understanding
Experiments for laser-driven ion acceleration create extreme states of matter, in particular relativistic solid-density plasmas undergoing transient, non-equilibrium physics. Especially the formation of such plasmas is heavily influenced by collisional and radiative effects. However, state-of-the-art simulations do not model transitions to and from excited atomic states self consistently. As these transitions are now becoming experimentally accessible on fs-nm scales, e.g. at HIBEF at the European XFEL, modelling can be improved by including excited states dynamics in simulations.
We are developing such an extension for the Particle-In-Cell(PIC) simulation code PIConGPU, to model atomic state distributions self consistently in transient plasmas. This extension is based on a reduced atomic state model directly coupled to the existing PIC-simulation, for which the atomic rate equation is solved explicitly in time.
Via the prediction of atomic state populations, this will allow us to predict plasma self-emission and XFEL probing, and improve our understanding of isochoric heating processes and plasma expansion.