Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster Session: Magnetic Confinement
P 12.7: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Progress toward the creation of magnetically confined pair plasmas — •Haruhiko Saitoh1,6, Uwe Hergenhahn1, Holger Niemann1,2, Norbert Paschkowski1, Thomas Sunn Pedersen1,2, Juliane Stanja1, Eve V. Stenson1, Matthew R. Stoneking1,3, Christoph Hugenschmidt4, Christian Piochacz4, Sebastian Vohburger4, Lutz Schweikhard2, James R. Danielson5, and Clifford M. Surko5 — 1Max-Planck-Institut für Plasmaphysik — 2Ernst-Moritz-Arndt-Universität Greifswald — 3Lawrence University — 4Technische Universität München — 5University of California, San Diego — 6The University of Tokyo
The PAX (Positron Accumulation eXperiment) and APEX (A Positron Electron eXperiment) projects aim to experimentally study the unique wave propagation and stability properties of pair plasmas. We plan to accumulate a large number of positrons in a multicell-type trap system (PAX) and to confine them with electrons in APEX, a levitated dipole or stellarator configuration, operated at the NEPOMUC facility, the world's most intense positron source. In this contribution, we report on recent results from PAX and APEX. We have conducted electron experiments with a 2.3 T Penning-Malmberg trap; confinement for more than 1 hour and observation of a collective mode were demonstrated. At NEPOMUC, we have characterized the positron beam for a wide energy range. In a prototype permanent-magnet dipole trap, efficient (38%) injection of the remoderated 5 eV positron beam was realized using ExB drifts. Based on these results, design studies on the confinement of pair-plasmas in a levitated dipole trap are ongoing.