SMI Seminar on fundamental interactions and symmetries

Towards a low energy electron-positron plasma in the lab

by Dr Adam Deller (Max Planck Institute for Plasma Physics, Garching, Germany)

Stefan Meyer Institute Seminar room 3rd floor, Kegelgasse 27, 1030 Vienna, AUSTRIA


Positively and negatively charged particles with equal mass can form a pair plasma. For instance, this can occur in extreme astrophysical environments that generate electron-positron pairs at sufficient density for collective effects to occur. The mass symmetry distinguishes pair plasma from the more familiar ion-electron plasma, and many conventional instabilities are expected to be suppressed. The APEX collaboration aims to verify this by creating a low-energy positron-electron plasma in the lab. The experiments will require an unprecedentedly large collection of low-energy positrons. I will present the current status of the APEX project, including the development of a buffer-gas trap for the high-intensity NEPOMUC positron beam and the results of preparatory work regarding the injection of positrons into a nonneutral electron plasma. In addition, I will review the latest progress in the design, construction, and diagnostic development of a levitated dipole trap and a compact optimized stellarator (EPOS). These two devices will be used to magnetically confine an electron-positron plasma, allowing this novel substance to be studied - for the first time - at low energy and over long timescales.

Dan Murtagh

Seminar room of the Stefan Meyer Institute
3rd floor, Kegelgasse 27, 1030 Vienna, AUSTRIA

Organized by

Stefan Meyer Institute