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T: Fachverband Teilchenphysik

T 51: Experimentelle Methoden der Astroteilchenphysik III

T 51.9: Vortrag

Dienstag, 10. März 2015, 18:45–19:00, I.13.70 (HS 27)

Photo Multiplier Tubes Candidates for the Cherenkov Telescope Array Project — •Dominik Müller for the MAGIC collaboration — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München

Photo Multiplier Tubes (PMTs) are the most wide spread detectors for fast low-level light signals. They are commonly used as standard light sensors for camera systems in imaging atmospheric Cherenkov telescopes. Years ago, an improvement program for the PMT candidates for the Cherenkov Telescope Array (CTA) project was initialized with the companies Hamamatsu Photonics K.K. (Japan) and Electron Tubes Enterprises Ltd. (England).
CTA is the next generation of imaging atmospheric Cherenkov telescopes for high energy gamma ray astrophysics. Therefore, we need PMTs with outstanding good parameters concerning quantum efficiency, pulse width, after-pulsing and transit time spread. The currently available "super-bialkali" PMTs show a peak Quantum Efficiency of 40% and have an enhanced collection efficiency of up to 95-98% for wavelengths ≥ 400nm. The pulse width averages around 3ns at a gain of 40000. Also, the after-pulsing for a set threshold level of ≥ 4 photo electrons is reduced down to 0,02%.
We will report on the measurement results of PMT R-12292-100 from Hamamatsu as the final version and the intermediate version PMT D569/3SA from Electron Tubes Enterprises as candidate PMTs for the CTA project.