Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 83: Kosmische Strahlung

T 83.9: Vortrag

Mittwoch, 2. März 2016, 18:50–19:05, VMP9 SR 30

Simulation of Galactic cosmic ray propagation using CrPropa3 — •Lukas Merten and Julia Tjus — Ruhruniversität Bochum, Germany

The propagation of charged cosmic rays through the Galactic environment influences all aspects of the observation at Earth. Energy spectrum, composition and anisotropy are changed due to deflections in magnetic fields and interactions with the interstellar medium. Today the transport is simulated with different simulation methods either based on the solution of a transport equation (multi-particle picture) or a solution of an equation of motion (single-particle picture).

This talk evaluates the possibility of a single-particle simulation of the Galactic propagation. In difference to the multi-particle picture this approach makes additional information available, e.g. trajectory information and concrete interaction positions of single particles. Furthermore, stochastic energy losses can be implemented very easily and even backtracking of particles is possible in some cases.

In doing so, the publicly available simulation software CrPropa3 is extended to suit Galactic modelling needs. This is done using a random walk ansatz for the diffusive Galactic propagation. This new procedure increased the performance of the program by a factor of more than 1 000 and is still sufficiently accurate. We will discuss the current status of this ansatz in this talk.