This proposal aims to unveil still debated properties of cosmic ray transport in the Universe.
An innovative numerical method is used to describe the propagation of cosmic rays inmagnetic turbulence. It is shown that this method allows exploring a range of cosmic rayenergies that had remained prohibitive with previous computational efforts.
The method has been implemented on an MPI-parallel test-particle code suitable for high-performance computing (HPC). Strong and weak scaling of the code run on MELUXINA have shown excellent code scalability up to thousands of cores.
The code will be used to study diffusion in isotropic turbulence superposed on a large-scale homogeneous guide field. More specifically, the simulations proposed will assess how the diffusion coefficients in the direction parallel and perpendicular to the guide field vary as a function of particle energy and turbulence amplitude.
Simulation results will be compared with existing theories of charged particle diffusion in turbulence.
The potential impact of the successful realization of this project on cosmic ray physics is discussed. The project will be pursued by a team of scientists with complementary expertise in plasma physics, HPC, and particle astrophysics.