Regensburg 2007 – wissenschaftliches Programm
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VA: Fachverband Vakuumphysik und Vakuumtechnik
VA 1: Large instruments for science
VA 1.2: Vortrag
Montag, 26. März 2007, 10:15–10:30, H9
Status of the Positron Beam Facility NEPOMUC and Positron Experiments at FRM II — •Christoph Hugenschmidt1,2, Thomas Brunner1, Benjamin Löwe1, Jakob Mayer1, Philip Pikart1, Christian Piochacz1,2, Martin Stadlbauer1,2, and Klaus Schreckenbach1,2 — 1Physik Department E 21, James-Franck-Strasse, 85748 Garching, Germany — 2ZWE FRMII, Technische Universität München, Lichtenbergstrasse 1, 85747 Garching, Germany
A low-energy positron beam of highest intensity is available at the neutron induced positron source NEPOMUC of the Munich research reactor Heinz Maier-Leibnitz FRM II. The energy dependent positron yield of the primary beam is in the range between 4·107 and 5·108 moderated positrons per second. Experiments have been performed for the regeneration of the platinum moderation foils of the in-pile positron source after degradation in order to improve the long-term stability of the beam intensity.
An overview of the present status of NEPOMUCs instrumentation is presented: (i) the coincident Doppler broadening spectrometer (CDBS) for defect spectroscopy, (ii) the apparatus for the analysis of positron annihilation induced Auger electron spectroscopy (PAES) for surface studies and (iii) a facility for the production of the negatively charged Positronium ion. Within this presentation future developments of the positron beam facility, the extension of the existing spectrometers and novel positron instrumentation will be discussed.