Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Magnetic Confinement I
P 7.6: Vortrag
Dienstag, 1. März 2016, 12:40–12:55, b305
First on-line positron experiments en route to pair-plasma creation — •Juliane Stanja1, Uwe Hergenhahn1, Holger Niemann1,2, Thomas Sunn Pedersen1,2, Haruhiko Saitoh1,3, Eve V. Stenson1, Matthew R. Stoneking4, Christoph Hugenschmidt5, Christian Piochacz5, and Lutz Schweikhard2 — 1Max-Planck-Institut für Plasmaphysik — 2Ernst-Moritz-Arndt Universität Greifswald — 3The University of Tokyo — 4Lawrence University — 5Technische Universität München
Electron-positron plasmas are predicted to show a fundamentally different behavior from traditional ion-electron plasmas, because of the equal masses of the two species. Using up to 109 positrons per second provided by the NEPOMUC (Neutron-Induced Positron Source Munich) facility, the APEX/PAX team aims to create the first such plasma confined in a toroidal magnetic trap. Positron beam parameters as well as efficient injection and confinement schemes for both species in toroidal geometries are fundamental to the project.
In this contribution we present results from first on-line positron experiments. Besides characterizing the NEPOMUC beam we conducted positron injection experiments into a dipole magnetic field configuration. Using static electric fields, a 5-eV positron beam was transported across magnetic field lines into the confinement region. With this method, up to 38% of the incoming particles reach the confinement region and make at least a 180∘ revolution around the magnet. Under dedicated experimental conditions confinement on the order of 1 ms was realized.