Dec 8 – 10, 2020 Online only
Online event
Europe/Berlin timezone

A buffer-gas trap for the NEPOMUC high-intensity low-energy positron beam

Dec 9, 2020, 2:30 PM
3h 30m
Online event

Online event

Poster UM: Nuclear, Particle, and Astrophysics Joint poster session of MLZ User Meeting and DN2020


Adam Deller (IPP)


The APEX collaboration aims to produce a neutral pair plasma, comprised of equal quantities of electrons and positrons, confined by the magnetic field of a levitated dipole. More than $10^{10}$ positrons are needed to achieve a short-Debye-length plasma with a volume of 10 litres and a temperature of $\sim 1$~eV, which necessitates new advances in positron accumulation. Buffer-gas positron traps have dramatically extended the scope for atomic and non-neutral plasma physics experiments involving antimatter. In these devices, a continuous beam of positrons enters a Penning-Malmberg trap, wherein inelastic collisions with low-density molecular gases promote the efficient capture of the antiparticles. We present our plans for the installation of a buffer-gas trap at the NEPOMUC neutron-induced positron source in Munich. Beyond the pair plasma experiments, an intense trap-based positron beam will also facilitate new applications, for example, the background-free measurement of positron-annihilation-induced Auger-electron spectra.

Primary authors

Adam Deller (IPP) Matthew Stoneking (Max Planck Institute for Plasma Physics) Thomas Sunn Pedersen (Max-Planck-Institut für Plasmaphysik) E. V. Stenson Dr Juliane Horn-Stanja (IPP) Uwe Hergenhahn (Max-Planck-Institut für Plasmaphysik) Mr Stefan Nissl (IPP) Alexander Card (Max-Planck-Institut für Plasmaphysik) Christoph Hugenschmidt Markus Singer Dr James R. Danielson (UCSD) Prof. Clifford M. Surko (UCSD) Mr Haruhiko Saitoh (University of Tokyo)

Presentation materials