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K: Fachverband Kurzzeitphysik
K 4: Optische Verfahren II
K 4.1: Invited Talk
Tuesday, March 31, 2009, 11:10–11:40, HS Physik
Low Energy Electron Beam Excitation of Fluorescence Detector Material — •Andreas Ulrich1, Margarida Fraga2, Thomas Heindl1, Reiner Krücken1, Teresa Marrodan1, Andrei Morozov1,2, Luis Pereira2, and Jochen Wieser3 — 1Physik Department, Technische Universität München, 85748 Garching, Germany — 2Faculdade de Ciencias e Technologia da Universidade de Coimbra and LIP, Coimbra, Portugal — 3Coherent GmbH, 81379 München, Germany
Fluorescence detectors are used for detecting particles over a huge energy range. In particle astrophysics the Pierre Auger detector [1] e.g. detects cosmic rays up to the Zetta eV range. In this case the ambient air is used as the fluorescent material with its variability in density, temperature, and humidity. For the search for proton decay and neutrino detection, large organic liquid-scintillators are used or planned such as LENA [2]. Since the fluorescent light is finally produced by collisional excitation processes and subsequent optical transitions with energies on the order of 10 eV, the performance of the detector material can be studied using low energy electrons. A table-top setup will be described which can be used for that purpose. Its key element is a 300nm thin entrance foil made from ceramic material through which the electrons are sent into gaseous or liquid scintillators. Experiments to specify both gaseous and liquid scintillators will be described.
[1] Pierre Auger Collaboration, Science 318, 938 (2007)
[2] T. Marrodan Undagoitia et al., J. Phys. Conf. Ser. 120, 052018 (2008)