Dresden 2020 – wissenschaftliches Programm
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AKBP 10.4: Vortrag
Dienstag, 17. März 2020, 17:15–17:30, HSZ 301
Level populations in PIC-Simulations — •Brian Edward Marre1, Michael Bussmann1, Axel Huebl2, Thomas Kluge1, and Ulrich Schramm1 — 1Helmholtz Zentrum Dresden -- Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Deutschland — 2Lawrence Berkeley National Laboratory, CA United States
The irradiation of solids with high intensity laser light is one future ion acceleration concept. The short laser pulse accelerates electrons which isochoricly heat the plasma and may accelerate ions due to local charge gradients.
Modelling atomic physics in Particle-in-a-Cell(PIC) simulations allows us to model these processes much more accurately. Predicting the charge state distributions more reliably which are important for all fundamental processes of laser absorption, electron acceleration and transport.
In order to include those processes self-consistently into PIC-Simulations we need to model the time evolution of the level populations based on local cell conditions and directly couple them to the PIC simulation. We explicitly solve the rate equations, without relying on a quasi Maxwellian local plasma temperature or local equilibrium conditions. This is necessary due the very short timescale of laser interactions, making a temperature definition difficult and prohibiting the use of lookup tables based on equilibrium assumptions.
We will include this as a package into the existing highly parallelized PIConGPU code to make the demanding calculations computationally feasible.