Dresden 2020 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Microscopy and Spectroscopy with X-rays, Ions and Positrons (joint session KFM/CPP)
CPP 28.7: Vortrag
Montag, 16. März 2020, 17:20–17:40, TOE 317
Positron Annihilation Studies using a Superconducting Electron Linac — •Maik Butterling1, Andreas Wagner1, Maciej Oskar Liedke1, Eric Hirschmann1, Ahmed G. Attalah1, Reinhard Krause-Rehberg2, 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 different techniques for positron annihilation spectroscopy. Two of them are being operated at a superconducting electron linear accelerator producing positrons via pair production from electron-bremsstrahlung. While one of the sources uses bremsstrahlung to directly generate positrons inside the sample of interest, in the second source (MePS), monoenergetic positrons with energies up to to 25 keV are used for thin-film studies of porosity and defect distributions. The MePS beam line is currently complemented by a new in-situ end station (AIDA-2), where defect studies can be performed in a wide temperature range during thin film growth and ion irradiation. Developments as well as 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 AIDA facility was funded by the Impulse- und Networking fund of the Helmholtz-Association (FKZ VH-VI-442 Memriox) and through the Helmholtz Energy Materials Characterization Platform.