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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.42: Poster
Dienstag, 31. August 2021, 14:00–16:00, P
Positron accumulation in a multi-cell Penning-Malmberg trap — •Martin Singer1, Patrick Steinbrunner1, Stephan König2, Matthew R. Stoneking1, James R. Danielson3, Lutz Schweikhard2, and Thomas Sunn Pedersen1,2 — 1Max Planck Institute for Plasma Physics, Germany — 2Institute for Physics, University of Greifswald, Germany — 3hysics Department, University of California, San Diego, USA
Positron-electron plasmas, which are examples of pair plasmas, are just beginning to be studied experimentally. Due to their equal mass constituents, many features that are found in electron-ion plasmas will not occur in pair plasmas, and they are expected to be extraordinarily stable when magnetically confined. The APEX collaboration aims to create the first magnetically confined, low energy pair plasma with a spatial dimension of several Debye lengths so that collective behavior can be observed. To create such a plasma numerous obstacles must be overcome, since positrons are rare. One crucial challenge is the accumulation of large numbers of moderated positrons. Therefore, a device is needed which is capable of storing up to 1011 positrons without heating and particle loss. One solution is the multi-cell Penning-Malmberg trap (MCT) concept, which separates the space charge of the positrons into an array of small Penning-Malmberg traps. We present first measurements with electrons stored in a single Penning trap that serves as the master-cell as well as in a prototype MCT. This MCT will be used to confine plasmas simultaneously in multiple cells, to investigate the confinement and different injection and ejection schemes.