Berlin 2018 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 24: Spectroscopy and Microscopy II with Positrons
KFM 24.2: Talk
Thursday, March 15, 2018, 10:00–10:20, E 124
Positron Annihilation Studies using a Superconducting Electron LINAC — •Andreas Wagner1, Maik Butterling1, Eric Hirschmann1, Reinhard Krause-Rehberg2, Maciej Oskar Liedke1, and Kay Potzger1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden, Germany — 2Martin-Luther-Universität Halle, Institut für Physik, 06099 Halle, Germany
The Helmholtz-Center at Dresden-Rossendorf operates several user beamlines for materials research using positron annihilation energy and lifetime spectroscopy. Two beamlines are being operated at a superconducting electron linear accelerator producing hard X-rays from electron-bremsstrahlung and in turn generating positrons from pair production. While one of the sources uses bremsstrahlung to directly generate positrons inside the sample of interest (named GiPS for Gamma-induced Positron Source), in the second source monoenergetic positrons (named MePS) with energies ranging from 500 eV to 25 keV are used for thin-film studies of porosity and defect studies. Examples of recent experimental results at all facilities will be presented. The MePS facility has partly been funded by the Federal Ministry of Education and Research (BMBF) with the grant PosiAnalyse (05K2013). The initial AIDA system was funded by the Impulse- und Networking fund of the Helmholtz-Association (FKZ VH-VI-442 Memriox). The AIDA facility was funded through the Helmholtz Energy Materials Characterization Platform.