Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 101: Cosmic Ray 6

T 101.2: Vortrag

Donnerstag, 24. März 2022, 16:30–16:45, T-H33

Optimization of the Numerical Calculation of the Field Line Random Walk Diffusion Tensor — •Jan-Niklas Bohnensack¹, Patrick Reichherzer^{1, 2}, Julia Becker Tjus^{1, 2}, Leander Schlegel^{1, 2}, and Julien Dörner^{1, 2} — ¹Theoretical Physics IV: Plasma-Astroparticle Physics, Faculty for Physics & Astronomy, Ruhr-Universität Bochum, D-44780 Bochum, Germany — ²Ruhr Astroparticle And Plasma Physics Center (RAPP Center), Bochum, Germany

The goal of this talk is to calculate the Field Line Random Walk (FLRW) diffusion coefficient. FLRW is the random movement of the magnetic fieldlines in a turbulent field, particles with low rigidities follow those lines and diffuse accordingly. The FLRW diffusion coefficient only depends on the turbulence of the magnetic fields and is particle-energy independent. That makes their calculation more universal and computationally more efficient. Therefore, the coefficient is of high relevance for providing astrophysical simulations for cosmic-ray transport with a fundamental description of the diffusion tensor. These can be applied in environments such as the Milky Way, but also relativistic plasmoids in jets of active galaxies. To check the agreement of the fieldlines to the corresponding particle trajectories, a GPU based visualization software based on the software Vispy was developed in this bachelor thesis. With the optimized FLRW software, we will present first results and interpretations of the FLRW diffusion tensor for different turbulence levels. Furthermore, we will show examples of 3D plotted fieldlines and particle trajectories with our visualization tool.