Hannover 2020 – scientific programme
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P: Fachverband Plasmaphysik
P 15: Helmholtz Graduate School 3 and Magnetic confinement 3
P 15.2: Talk
Wednesday, March 11, 2020, 14:30–14:55, b305
Geometry and Kinetics of Astrophysical Plasmas: A gyrokinetic approach — •Felipe Nathan de Oliveira Lopes1,2, Karen Pommois1,2, Aleksander Mustonen1,2, Rainer Grauer2, and Daniel Told1,2 — 1Max Planck Institute for Plasma Physics — 2Ruhr-University Bochum
In the context of astrophysical plasmas, various methods are used in order to study problems such as dissipation of turbulent energy and magnetic reconnection[1][2][3]. The use of fluid models allow us to understand macroscopic phenomena[4], but lacks the dynamics of kinetic physics[5]. On another hand, kinetic models[6] usually consume an enormous amount of computing time. The use of reduced models such as gyrokinetics are foreseen to bridge the gap between the fluid and kinetic approaches[7].
In the present work, we aim to investigate the use of gyrokinetics in two different scenarios. Firstly we are going to consistently derive a hybrid hamiltonian field theoretical system[8, 9, 10], based on the lagragian formulation of a symplectic two-form[11]. In this system, ions are treated fully kinetically, and electrons gyrokinetically. With this model, we wish to develop a cost effective kinetic computational framework. The second aspect of the present work addresses a well known problem in space physics, namely magnetic reconnection with guide field[12]. We start with a gyrokinetic analysis using the code GENE[13]. Firstly we analyze the dynamics of the parallel electric field and reconnection rate on the X point, and proceed with benchmarking GENE with a fully kinetic PIC code.