Bremen 2017 – scientific programme
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P: Fachverband Plasmaphysik
P 13: Magnetic Confinement
P 13.1: Poster
Tuesday, March 14, 2017, 16:30–18:30, HS Foyer
High-efficiency injection of positrons into a magnetic dipole trap — •Markus Singer1, James R. Danielson2, Marcel Dickmann1, Uwe Hergenhahn3, Juliane Horn-Stanja3, Haruhiko Saitoh3,4, Eve V. Stenson3, Matthew R. Stoneking5, Thomas Sunn Pedersen3,6, and Christoph Hugenschmidt1 — 1Technische Universität München — 2University of California, San Diego — 3Max-Planck Institut für Plasmaphysik — 4University of Tokyo — 5Lawrence University, Wi, USA — 6Ernst-Moritz-Arndt University Greifswald
Electron-positron plasmas represent a unique state of matter as pair-plasmas. The mass symmetry of the particles lead to fundamentally different physical phenomena compared to conventional electron-ion plasmas. Despite great theoretical interest these plasmas have not been magnetically confined yet. The goal of APEX (A-Positron-Electron-eXperiment) projects is the creation of magnetically confined electron-positron plasmas, by injecting positrons from the world*s most intense positron source NEPOMUC (NEutron-induced POsitron Source MUniCh) into a magnetic dipole trap, which will also allow the simultaneous confinement of electrons. The current prototype trap mainly consists of a cylindrical permanent magnet which is placed in the center of a segmented ring electrode. Positrons are guided into the dipole by E x B plates which induce a drift motion across closed magnetic field lines.In recent experiments, by tailoring electrostatic fields in the trap, the injection efficiency could be increased up to 100%. The results from these experiments will be presented and compared to simulations.