Interdisziplinäres Zentrum für Materialwissenschaften
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Martin-Luther-Universität
Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
Heinrich-Damerow-Str. 4,
D-06120 Halle, Germany
Tel.: +49 345 55 28471
Telefax:+49 345 55 27390 email: info@cmat.uni-halle.de
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Abstracts

A. Wagner, W. Anwand, A. G. Attallah, G. Dornberg, M. Elsayed, D. Enke, A. E. M. Hussein, R. Krause-Rehberg, M. O. Liedke, K. Potzger, T. T. Trinh
Positron annihilation lifetime spectroscopy at a superconducting electron accelerator
Journal of Physics: Conference Series 791 (2017),

The Helmholtz-Zentrum Dresden-Rossendorf operates a superconducting linear accelerator for electrons with energies up to 35 MeV and average beam currents up to 1.6 mA. The electron beam is employed for production of several secondary beams including X-rays from bremsstrahlung production, neutrons, and positrons. The secondary positron beam after moderation feeds the Monoenergetic Positron Source (MePS) where positron annihilation lifetime (PALS) and positron annihilation Doppler-broadening experiments in materials science are performed in parallel. The adjustable repetition rate of the continuous-wave electron beams allows matching of the pulse separation to the positron lifetime in the sample under study. The energy of the positron beam can be set between 0.5 keV and 20 keV to perform depth resolved defect spectroscopy and porosity studies especially for thin films.

DOI 10.1088/1742-6596/791/1/012004


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