High-power radiation source ELBE and positron annihilation spectroscopy facilities

The ELBE center for high-power radiation sources at the Helmholtz-Zentrum DresdenRossendorf (HZDR) operates a unique superconducting electron linear accelerator (LINAC) capable to deliver high-brilliance, low-emittance continuous-wave electron beams. The primary electron beam feeds several other high-performance, secondary beamlines: (i) free-electron lasers (FELBE) generating intense, tunable mid- and far-infrared light, (ii) a superradiant, phase-stable Terahertz source for exploring high-field material dynamics (TELBE), (iii) a compact neutron time-of-flight facility dedicated to nuclear astrophysics and transmutation research (nELBE), (iv) a high-brilliance bremsstrahlung facility used for photon-scattering and nuclear physics studies (ELBE), and (v) a unique Positron Annihilation Spectroscopy (PAS) infrastructure (pELBE) dedicated to depth resolved analysis of point defects in functional materials. In my talk I will give a general overview of ELBE beamlines with a higher focus to PAS techniques and highlight several recent successful stories from our users experiments. Positron Annihilation Lifetime Spectroscopy (PALS) method available at the Mono-energetic Positron Spectroscopy (MePS) and Apparatus for In-situ Defect Analysis (AIDA) systems will be presented, which enables kinematic approach to investigate defect physics under application of external stimulus like: deposited material, high intensity light, electrical field, temperature, and ions. It will be show that by employing positrons to probe defect microstructure allows to study most of material classes, including superconducting coatings, semiconducting thin films, as well as magnetic nitrides and oxides, or porous organic layers.