Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 25: Poster III
P 25.9: Poster
Donnerstag, 29. Februar 2024, 16:30–18:30, ELP 6: Foyer
Development of advanced accumulation techniques for a multi-cell Penning-Malmberg trap — •Martin Singer1,2, Eve Stenson3, and Lutz Schweikhard2 — 1Institut für Plasma Physik, Greifswald, Germany — 2Institut für Physik, Universität Greifswald, Germany — 3Institut für Plasma Physik, Garching, Germany
Penning-Malmberg (PM) traps are employed to accumulate large quantities of charged particles. However, this accumulation in single PM traps is often limited by the space charge. The multi-cell PM trap (MCT) avoids large space charges by distributing the particles into many traps [1]. These small-diameter storage traps are arranged on and off axis next to a large-diameter master trap that is used to catch and bunch of charged particles and to transfer them to the storage traps. The APEX ("A Positron Electron eXperimet") collaboration plans to use the MCT to accumulate unprecedented amounts of positrons. Subsequently, these positrons will be used to form the first confined electron-positron plasma either in the magnetic field of a levitating dipole magnet, or in an optimized tabletop stellarator [2]. This contribution will detail the latest MCT developments, and the techniques developed for the off-axis transfer [3]. We aim for the accumulation of 3×109 positrons in each off-axis cell. This will function as a proof of principle for the MCT concept and allow for the accumulation of up to 1×1010 positrons, the number needed for the positron-electron plasma creation. [1] D.R. Wittemann, et al. J. Plasma Phys. 89.4 (2023). [2] M.R. Stoneking, et al. J. Plasma Phys. 86.6 (2020). [3] M. Singer, et al. J. Plasma Phys. 89.5 (2023).
Keywords: Plasma Confinement; Non-neutral plasma; Positron-Electron Plasma