Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster II
P 12.20: Poster
Dienstag, 27. Februar 2024, 16:30–18:30, ELP 6: Foyer
Hybrid gyrokinetics: Electromagnetic effects in weakly magnetized plasmas — •Sreenivasa chary Thatikonda1, Felipe nathan De Oliveira lopes1, Aleks Mustonen2, Rainer Grauer2, Daniel Told1, and Frank Jenko1 — 1Max planck institute for plasma physics, Garching, Germany — 2Ruhr-Universität Bochum
We aim to study instabilities, turbulence and reconnection phenomena in weakly magnetized plasmas. Such conditions may be found in natural plasmas such as the solar wind, but also in laboratory applications, e.g. in the edge of fusion plasmas. Due to steep gradients in the edge of fusion plasmas and high frequencies in space plasmas, the ordering assumptions of gyrokinetic theory (like low frequency or moderate gradients) may be challenged, particularly for ions. To overcome these limitations, we derived equations for a hybrid model that includes fully kinetic physics for the ions, but gyrokinetic physics for the electrons. The hybrid model's electrostatic version has been numerically implemented into the existing simulation code, ssV. Semi-Lagrangian schemes (e.g., the PFC scheme [Filbet et al., JCP 2001])are employed in ssV.When implementing EM effects, we have to overcome some numerical problems such as the Ampere cancellation problem. To solve this problem, we need to have sufficient velocity space and evaluate the integrals with utmost care. Ongoing work on ssV includes it's applications to space and astrophysical plasmas: For example, magnetic reconnection at the ion scales.
Keywords: gyrokinetic theory; weakly magnetized plasmas; turbulence; instabilities; magnetic reconnection