München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.116: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Simulation of positrons in a magnetic dipole trap — •Stefan Nißl1,2, Eve V. Stenson2,4, Haruhiko Saitoh3, Juliane Horn-Stanja1, Uwe Hergenhahn1,7, Thomas Sunn Pedersen1,5, Matthew R. Stoneking6, Markus Singer2, Marcel Dickmann2, Christoph Hugenschmidt2, Lutz Schweikhard5, James R. Danielson4, and Cliff M. Surko41Max-Planck-Institut für Plasmaphysik — 2Technische Universität München — 3Universität Tokio — 4University of California, San Diego — 5Universität Greifswald — 6Lawrence University, Appleton (Wisconsin) — 7Leibniz-Institut für Oberflächenmodifizierung

APEX (A Positron Electron eXperiment) aims to create an electron-positron pair plasma in a magnetic dipole trap. To achieve this goal, a highly efficient positron injection scheme is an essential prerequisite. The large parameter space (multiple electrodes and steering coils to manipulate the beam) and the limited diagnostic capabilities (current and annihilation count measurements) of the experiment demanded a numerical counterpart to further understand the processes occurring during injection as well as confinement. Using discrete electric fields, analytic formulas to calculate the magnetic fields and a variant of the Boris integrator as particle pusher, full trajectory simulations were conducted and were able to reproduce the experimental data. Possible future applications include tests for adiabaticity and optimizations for the upcoming next stage of APEX with a levitating superconducting dipole coil.

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