Dec 7 – 8, 2021 Online only
Europe/Berlin timezone

The Pulsed Low-Energy Positron System PLEPS: Recent Developments

VC Room link
Only available for registered users!
Dec 7, 2021, 1:40 PM
Talk Positrons Positrons


Ricardo Helm (Universität der Bundeswehr München)


The Pulsed Low-Energy Positron System PLEPS [1] is a user facility for defect depth-profiling by means of positron lifetime measurements with a monochromatic pulsed positron beam of variable energy ranging from 0.5-21 keV at the intense positron source NEPOMUC at the MLZ in Garching [2].
To further extend the scope of defect characterization of PLEPS various possibilities of in-situ manipulation of the sample during lifetime measurements have been implemented: To drift positrons to layers, interfaces and surfaces it is now possible to apply electrical fields to the sample. A wave-length selective broadband illumination system was installed to manipulate the charge-state of optically active defects. Also, the sample temperature may be varied between 80 K and 600 K. The data-acquisition system was updated to match recent advances at the NEPOMUC remoderator [3]. Moreover, numerical simulations of crucial pulsing components have been conducted to further improve the performance of PLEPS.

[1] W. Egger, Proc. Int. School Phys. “E. Fermi”, CLXXIV (eds. A. Dupasquier and A. P. Mills jr.), IOS Press: Amsterdam, 419 (2010).
[2] Ch. Hugenschmidt, JLSRF 1 (2015) A 22
[3] M. Dickmann, Acta Phys Pol A 137 (2020) 149

Primary author

Ricardo Helm (Universität der Bundeswehr München)


Werner Egger (Universität der Bundeswehr München) Marcel Dickmann Johannes Mitteneder (Universität der Bundeswehr) Dr Gottfried Kögel (Universität der Bundeswehr München) Dr Peter Sperr (Universität der Bundeswehr München) Günther Dollinger

Presentation materials

There are no materials yet.