Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.39: Poster

Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Study on Fast Electrons Generated in the Stellarator Experiment TJ-K — •José Ignacio Fernández Gómez, Alf Köhn-Seemann, and Mirko Ramisch — IGVP, University of Stuttgart, Germany

The TJ-K stellarator is equipped with a microwave heating system capable of delivering power at three frequencies: 3 kW at 2.45 GHz, 3 kW at around 8 GHz, and 6 kW at around 14 GHz. While the bulk electron temperature is typically around 10 eV, fast electrons with energies ranging from several 100 eV to 100 keV are found in various experimental scenarios. In this work, the trajectories of these fast electrons are simulated in the 3D magnetic field geometry of TJ-K. It is found that these particles, when comparing movement parallel and anti-parallel to the magnetic field, can result in toroidal net currents if the drift surfaces differ sufficiently. Configurations resulting in toroidal net currents are identified and the underlying physics processes are discussed. Selected scenarios are experimentally analyzed to measure the toroidal net current, providing a basis for validating the simulation outcomes.

Keywords: fast electrons; electron drift trajectories; toroidal net current; stellarator; TJ-K