Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 8: Low Pressure Plasmas II
P 8.7: Vortrag
Dienstag, 17. März 2026, 18:15–18:30, KH 01.020
Characterizing pure electron plasmas with an electron beam diagnostic in a levitating dipole trap — •Veronika Bayer1, Adam Deller1,2, Alex Card1, Patrik Steinbrunner1, Matthew Stoneking3, and Eve Stenson1 — 1Max Planck Institut für Plasmaphysik, Garching b München — 2University of California San Diego, San Diego, CA, USA — 3Lawrence University, Appleton, WI, USA
Electric fields play a dominant role in the dynamics of pure electron non-neutral plasmas (NNPs), such as those studied in the APEX levitating dipole trap (APEX-LD). Multiple different, ideally non-invasive, diagnostics verify the presence of a plasma and determine the confinement time. Existing diagnostics are able to confirm the presence of plasma, as long as the plasma density changes. A new electron beam diagnostic, which can detect plasma regardless of density peturbation is implemented on a levitating dipole; and first results from this diagnostic are presented. Electrons are emitted by this diagnostic onto a field line passing through the center of the floating coil and are collected on the opposite side. As plasmas become trapped within the magnetic field lines of APEX-LD, the resulting space charge potential can reflect the electron beam; the collected current therefore provides a way to determine the potential of the trapped plasma.
Keywords: electron plasma; levitating dipole; plasma physics; non neutral plasmas