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T: Fachverband Teilchenphysik

T 62: Cosmic Rays III

T 62.4: Vortrag

Mittwoch, 18. März 2026, 17:00–17:15, KS 00.006

Investigation of the Diffusion Tensor for Different Turbulence Levels and Rigidities in the Resonant Scattering Regime — •Jan-Niklas Bohnensack¹ and Julia Becker Tjus^1,2,3 — ¹Theoretical Physics IV: Plasma-Astroparticle Physics, Faculty for Physics & Astronomy, Ruhr-Universityät Bochum, D-44780 Bochum, Germany; Supported by SFB1491 — ²Ruhr Astroparticle And Plasma Physics Center (RAPP Center), Bochum, Germany — ³Department of Space, Earth and Environment, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden

The quasi-linear theory (QLT) describes the interactions between charged particles and astrophysical plasmas in the limit of b/B ≪ 1. The goal of the underlying thesis was to verify the QLT’s prediction that for small turbulence levels b/B, where b is the turbulent magnetic field strength and B is the homogeneous magnetic field strength, the diffusion coefficient behaves like κ ∝ ρ^γ with γ = 1/3. To overcome those restrictions a code was developed in the underlying thesis to utilize methods of parallelization that calculate the running diffusion coefficient from particles propagated with CRPropa faster. The diffusion coefficients were generated for a range of reduced rigidities so that the particles scatter resonantly at any point in space for a given turbulence level. This talk shows new simulated data which better shows the behavior of the spacial diffusion coefficient against different turbulent levels and reduced rigidities. I will further give an outlook on how we will use the diffusion coefficients in future simulations and experiments (e.g. in laboratory plasmas or diffusive transport simulations).

Keywords: Diffusion Tensor; Quasi Linear Theory; Simulation; CRPropa