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Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 19: Helmholtz Graduate School 4 and Magnetic confinement 4

P 19.5: Vortrag

Donnerstag, 12. März 2020, 12:40–12:55, b305

Development of a levitated dipole trap to study positron-electron plasma — •Matthew Stoneking1,2, Juliane Horn-Stanja1, Haruhiko Saitoh3, Eve Stenson1, Stefan Nißl1,4, Thomas Sunn Pedersen1,5, Alexander Card1, Christoph Hugenschmidt4, Markus Singer4, James Danielson6, Clifford Surko6, and Uwe Hergenhahn11Max Planck Institute for Plasma Physics, Garching and Greifswald, Germany — 2Lawrence University, Appleton, USA — 3University of Tokyo, Japan — 4Technische Universität München, Garching, Germany — 5University of Greifswald, Germany — 6University of California, San Diego, USA

A Positron-Electron eXperiment (APEX) is a project that aims to produce and study magnetically confined short Debye-length positron-electron plasma. We present design plans for a levitated dipole experiment to realize this goal. The design uses a floating coil constructed with high temperature superconducting tape (average radius 7.5 cm, current 30-50 kA-turns) to produce magnetic fields of order 0.1 - 1.0 T. Current is induced in the floating coil by inductive charging using a second superconducting coil (70-140 kA-turns). Two (~100 W) cryo-coolers cool the superconducting coils (to 20K) and a copper radiation shield (to 80 K). Laser rangefinders provide position and attitude signals to feedback on the lifting coil (water-cooled, ~5 kA-turns) power supply. Positrons and electrons are injected into the dipole field using pulsed electric fields to produce ExB drifts that carry particles across the field. Scintillation detectors employed in pairwise coincident configurations detect annihilation gamma rays to diagnose positron losses.

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