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P: Fachverband Plasmaphysik
P 8: Helmholtz Graduate School HEPP II
P 8.1: Vortrag
Dienstag, 29. März 2022, 14:00–14:25, P-H12
PIC-Simulations of Perpendicular Collisionless Shocks in Multiple-Ion GRB Plasmas — •Jonas Graw, Martin Weidl, and Frank Jenko — Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Deutschland
Ultra-high-energy cosmic rays (UHECRs) are electrically charged particles, which move throughout the universe with energies greater than about 1 EeV. One likely source of UHECRs is a gamma-ray burst (GRB). The latter eject gas parallel to the axis of rotation with high velocities. Shocks are formed in these jets, in which particles are believed to be accelerated to extremely high velocities. Due to such high energies, protons and neutrons fuse to alpha particles. In our research, we simulate an astrophysical plasma consisting of multiple ion species in a mildly relativistic shock.
We simulate perpendicular collisionless shocks with multiple ion species in a mildly relativistic (γ β=2) 2D3V PIC setup and we analyze in how far these shocks differ compared to single ion shocks. We observe alternating maxima of the two ion species in real space. When analyzing the highest-energetic particles, we observe that they are accelerated by shock-drift acceleration. We conduct research on how multiple-ion shocks affect the electron acceleration efficiency єe - a quantity that is observable by astronomers due to synchrotron emission and notice that єe is only slightly influenced by multiple-ion shocks. Furthermore, we analyze how the shock physics changes when using in-plane and out-of plane shock simulations and when using different magnetizations σ=1, 0.1, 0.01.