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P: Fachverband Plasmaphysik

P 19: Poster II

P 19.15: Poster

Thursday, March 31, 2022, 16:00–17:30, P

Off-axis confinement and pulse stacking in a multi-cell Penning-Malmberg trap — •Martin Singer^1,4, James R. Danielson², Matthew R. Stoneking³, Lutz Schweikhard⁴, and Thomas Sunn Pedersen^1,4 — ¹Max-Planck Institute for Plasma Physics, 17491 Greifswald, Germany — ²University of California, San Diego, La Jolla, California 92093, USA — ³Lawrence University, Appleton, Wisconsin 54911, USA — ⁴University of Greifswald, 17489 Greifswald, Germany

For the operation of a multi-cell Penning-Malmberg trap (MCT) the transfer to the storage-cells and consistent stacking of pulses is an essential step. This becomes increasingly complex when many pulses needs to be added in each storage-cell to reach large particle numbers and high plasma space charges, and when the small diameter storage-cells are radially displaced with respect to the large diameter master-cell. If the plasma is displaced off-axis and expanded over both cells, its motion is dominated by competing diocotron drifts. Also, the transfer and pulse stacking into the off-axis cell can lead to halo formation and the loss of particles. Since the APEX collaboration aims to create and study the first magnetically confined, low energy pair plasma, the MCT is a crucial tool on the way to accumulate up to 10¹¹ positrons with low heating and particle loss. We will present our new MCT and measurements where we already achieved the transfer and confinement in two off-axis cells simultaneously. This MCT will be used to address open questions such as concerning plasma transfer and stacking as well as off-axis ejection.