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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Microscopy and Tomography with X-ray Photons, Electrons, Ions and Positron

KFM 9.8: Talk

Wednesday, March 29, 2023, 11:35–11:55, POT 106

Positron beams for materials research — •Andreas Wagner¹, Maik Butterling¹, Ahmed Gamal Elsherif¹, Eric Hirschmann¹, Maciej Oskar Liedke¹, and Reinhard Krause-Rehberg² — ¹Institute for Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ²Martin-Luther-Universität Halle-Wittenberg, Dept.of Physics, 06099 Halle/Saale, Germany

The Helmholtz-Center Dresden - Rossendorf operates several user beamlines for materials research using positron-annihilation energy and lifetime spectroscopy. The superconducting electron linear accelerator ELBE drives several secondary beams including hard X-ray production from electron-bremsstrahlung, which serves as an intense source of positrons by means of pair production. The Mono-energetic Positron Source MePS [1] utilizes positrons with variable kinetic energies ranging from 0.5 to 18 keV for depth profiling of atomic defects and porosities on nm-scales in thin films. High timing resolutions (σt *100 ps) at high average rates (105 s-1) and adjustable beam repetition rates allow performing high-throughput experiments. The MePS facility has partly been funded by the Federal Ministry of Education and Research (BMBF) with the grant PosiAnalyse (05K2013). AIDA was funded by the Impulse- und Networking fund of the Helmholtz-Association (FKZ VH-VI-442 Memriox) and by the Helmholtz Energy Materials Characterization Platform. [1] A. Wagner, et al., AIP Conference Proceedings, 1970, 040003 (2018).