SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 4: HEPP II
P 4.4: Vortrag
Montag, 20. März 2023, 17:45–18:10, CHE/0091
Suppression of Diocotron Drift Modes and Increased Transfer in a Multicell Trap — •Martin Singer1,3, James R. Danielson2, and Lutz Schweikhard3 — 1IPP Greifswald, Germany — 2Department of Physics, UCSD, USA — 3Institut für Physik, Universität Greifswald, Germany
The A Positron Electron eXperiment (APEX) will accumulate large quantities of positrons for a positron-electron (pair) plasma which are an excellent candidate to test basic plasmas physics. To this end we have designed and constructed a new multicell Penning-Malmberg trap (MCT). It includes a master-cell, and three prototype storage cells (one on-axis, and two off-axis). With this device we will test and improve the plasma transfer to the off-axis cells and the stacking of multiple plasma pulses to create large space-charges. We will develop suitable protocols to achieve these key goals, for the use of a MCT at the NEPOMUC positron source in Munich.
In this contribution, we will discuss the dynamics during the transport to the off-axis cells. These are dominated by competing diocotron drift modes. We developed techniques to suppress these modes to mitigate losses and to center the plasma in the off-axis cells. Furthermore, we demonstrated an improved transfer and consecutive transfer to multiple off-axis cells. This enabled the first simultaneous confinement in two different off-axis storage cells. The work was funded by DFG (Grant Nos. SCHW 401/23-1, Hu 978/15-1 and PE 2655/1-1) and ERC (Grant No. 741322). JRD is funded by U.S. DOE (Grant No. DE-SC0019271).