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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 15: New Accelerator Concepts
AKBP 15.4: Talk
Thursday, March 23, 2023, 16:15–16:30, CHE/0184
Better Atomic Physics for Laser Accelerator Plasmas — •Brian Edward Marre1, Axel Huebl2, Rene Widera1, Sergei Bastrakov1, Michael Bussmann3, Thomas Cowan1, Ulrich Schramm1, and Thomas Kluge1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Berkley National Lab, Berkley, USA — 3CASUS, Görlitz, Germany
Standard atomic physics models in PIC simulation either neglect excited states, predict atomic state population in post processing only, or assume quasi-thermal plasma conditions.
This is no longer sufficient for high-intensity short-pulse laser generated plasmas, due to their non-equilibrium, transient and non-thermal plasma conditions, which are now becoming accessible in XFEL experiments at HIBEF (EuropeanXFEL), SACLA (Japan) or at MEC (LCLS/SLAC). To remedy this, we have developed a new extension for our PIC simulation framework PIConGPU to allow us to model atomic population kinetics in-situ in PIC-Simulations, in transient plasmas and without assuming any temperatures. This extension is based on a reduced atomic state model, coupled to the existing PIC-simulation and solved explicitly in time, depending on local interaction spectra and with feedback to the host simulation. This allows us to model de-/excitation and ionization of ions in transient plasma conditions, as typically encountered in laser accelerator plasmas. This new approach to atomic physics modelling will be very useful in plasma emission prediction, plasma condition probing with XFELs and laser plasma accelerator performance prediction.