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T: Teilchenphysik
T 206: Detektoren II
T 206.4: Vortrag
Dienstag, 11. März 2003, 14:45–15:00, SFO10
Enhancement in the sensitivity of photomultipliers for air cherenkov telescopes — •David Paneque1, Eckart Lorenz1, Keiichi Mase1,2, and Razmik Mirzoyan1 — 1Max–Planck–Institut für Physik, Föhringer Ring 6, D–80805 München — 2on leave from Institute for Cosmic Ray Research, University of Tokyo, 5–1–5 Kashiwa–no–Ha, Kashiwa City, Chiba 277–8582, Japan
A simple method to enhance the sensitivity of photomultipliers (PMT) will be described. The method is based on applying onto the cathode window a specially prepared lacquer containing a wavelength shifter (WLS). A rapidly evaporating lacquer solvent results in a milky surface that acts as a photon scatterer. Applying the method to the ET 9116A PMT (hemispherical borosilicate window and Rubidium-bialkali photocathode) resulted in a good sensitivity in the short wave UV range, as well as a > 20% increase above 330 nm. Besides, this technique also improves the spatial response uniformity of the PMT. A very brief description of the procedure, a simple model for the explanation of the enhancement in the sensitivity, and some plots showing this improvement in the performance of the PMT will be shown.