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P: Fachverband Plasmaphysik
P 8: Helmholtz Graduate School HEPP II
P 8.3: Talk
Tuesday, March 29, 2022, 14:50–15:15, P-H12
Investigations into the confinement of positrons in a magnetic dipole trap — •Stefan Nißl1,2, Eve Stenson1,2,3, Jens von der Linden1, Adam Deller1,3, Juliane Horn-Stanja1, Uwe Hergenhahn1,7, Thomas Sunn Pedersen1,4, Haruhiko Saitoh6, Christoph Hugenschmid2, Markus Singer1,2, Matthew Stoneking1,5, and James Danielson3 — 1Max-Planck-Institute for Plasma Physics — 2Technische Universität München — 3University of California, San Diego, La Jolla, CA, USA — 4University of Greifswald — 5Lawrence University, Appleton, WI, USA — 6The University of Tokyo — 7Fritz-Haber-Institut der Max-Planck-Gesellschaft
The APEX (A Positron-Electron Experiment) collaboration aims to create a strongly magnetized, low-temperature, electron-positron plasma in a magnetic trap. This *pair plasma* is predicted to have unique characteristics and excellent stability properties due to the equal masses of the participating species. In order to achieve plasma densities using the available rate of positrons, it is beneficial to confine positrons for as long as possible and to be able to add them to the trap in multiple batches. Previous experiments in a prototype dipole trap already demonstrated a lifetime of >1s. Single-particle simulations helped to identify the main loss mechanisms and guided key improvements to the trap structure and experiment parameters. Upcoming experiments with significantly improved gamma detection capabilities will focus, among other objectives, on the confirmation of longer confinement times as well as the feasibility of accumulating multiple positron pulses in the trap.