Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 5: Poster Session 1

P 5.8: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Positron accumulation in Multicell Penning traps — •Martin Singer¹, Stephan König², Lutz Schweikhard², Gerrit Marx², Cliff Surko³, James Danielson³, and Thomas Sunn Pedersen¹ — ¹Max-Planck-Institut für Plasma Physik, Wendelsteinstraße 1, 17491 Greifswald, Germany — ²Institut für Physik, Universität Greifswald, Felix-Hausdorff-Straße 6, 17489 Greifswald, Germany — ³Physics Department, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA

Positron-electron plasmas, also pair plasmas, have not yet been studied experimentally. Due to their equal mass, many features that can be 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 pair plasma with a spatial dimension of several Debye lengths so that collective behavior will be observable. To create such a plasma great care has to be taken since positrons are naturally rare. One crucial part is the accumulation of large numbers of moderated positrons. Therefore, a device is needed which is capable of storing up to 10¹² positrons without heating and particle loss. One solution is the Multicell Penning trap (MCT) concept, which separates the space charge of the positrons into multiple radially arranged Penning traps. We will present first measurements with electrons stored in a single Penning trap in Greifswald and plans for the development of a MCT. This MCT will be used to confine plasmas simultaneously in different cells, investigate the confinement and different injection as well as ejection schemes.