Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Magnetic Confinement - Poster
P 12.9: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Limitations on positron confinement in a magnetic dipole trap — •Juliane Horn-Stanja1, Uwe Hergenhahn1, Stefan Nißl1, Thomas Sunn Pedersen1,2, Haruhiko Saitoh1,3, Eve V. Stenson1, Matthew R. Stoneking4, Marcel Dickmann5, Christoph Hugenschmidt5, Markus Singer5, and James R. Danielson6 — 1Max-Planck-Institute for Plasma Physics — 2Universität Greifswald — 3University of Tokyo, Japan — 4Lawrence University, USA — 5Technische Universität München — 6University of California, San Diego, USA
The magnetic dipole field permits both in planetary magnetospheres and in the laboratory exceptional charged particle confinement with an arbitrary degree of neutrality. This makes it a promising geometry for the creation and study of a maybe even more unconventional object of research - a magnetized low-energy electron-positron plasma. Basic prerequisite for its success is the development of techniques for charged-particle injection into a closed magnetic system and subsequent particle manipulation and confinement. These challenges have been addressed in positron experiments with a prototype dipole trap at NEPOMUC, the world’s most intense source of low-energy positrons.
In recent injection-hold-dump experiments we observed positron confinement times ranging from 0.2 to 1.3 seconds depending on the experimental conditions. In this contribution we will discuss asymmetries and collisions with neutrals as potential loss mechanisms. Together with results from single-particle simulations this yields a reasonable explanation for the observed confinement times.