FACT -- The G-APD revolution in Cherenkov astronomy
| Autor: | Fabian Temme, U. Horisberger, S. Muller, C. Haller, H. Anderhub, Michael Backes, A. Gendotti, K.-S. Kim, Etienne Lyard, Adrian Biland, Ulf Roser, Felicitas Pauss, Francesca Nessi-Tedaldi, A.-K. Overkemping, Ilana M. Braun, V. Boccone, Oliver Grimm, K. Meier, Aleksander Paravac, D. Neise, M. L. Knoetig, M. Lee, Daniela Dorner, Sabrina Einecke, M. Meharga, S. Tobler, Jens Buss, K. Warda, J.-H. Köhne, Dieter Renker, R. Walter, Franck Cadoux, M. Ribordy, J. Schneider, D. Hildebrand, G. Viertel, Teresa Montaruli, M. Zänglein, L. Djambazov, J.-P. Stucki, Julia Thaele, Q. Weitzel, Karl Mannheim, T. Krähenbühl, Christina Hempfling, E. Lorenz, Patrick Vogler, T. Steinbring, B. Huber, V. Commichau, H. von Gunten, Thomas Bretz, B. Krumm, Wolfgang Rhode, Werner Lustermann, D. Eisenacher |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
Physics - Instrumentation and Detectors Photon Physics::Instrumentation and Detectors Astrophysics::High Energy Astrophysical Phenomena Detector Astrophysics::Instrumentation and Methods for Astrophysics Astronomy FOS: Physical sciences Instrumentation and Detectors (physics.ins-det) law.invention Telescope law Resistor Astrophysics - Instrumentation and Methods for Astrophysics Blazar Instrumentation and Methods for Astrophysics (astro-ph.IM) Cherenkov radiation Voltage Diode |
| Zdroj: | NASA Astrophysics Data System |
| DOI: | 10.48550/arxiv.1403.3573 |
| Popis: | Since two years, the FACT telescope is operating on the Canary Island of La Palma. Apart from its purpose to serve as a monitoring facility for the brightest TeV blazars, it was built as a major step to establish solid state photon counters as detectors in Cherenkov astronomy. The camera of the First G-APD Cherenkov Telesope comprises 1440 Geiger-mode avalanche photo diodes (G-APD), equipped with solid light guides to increase the effective light collection area of each sensor. Since no sense-line is available, a special challenge is to keep the applied voltage stable although the current drawn by the G-APD depends on the flux of night-sky background photons significantly varying with ambient light conditions. Methods have been developed to keep the temperature and voltage dependent response of the G-APDs stable during operation. As a cross-check, dark count spectra with high statistics have been taken under different environmental conditions. In this presentation, the project, the developed methods and the experience from two years of operation of the first G-APD based camera in Cherenkov astronomy under changing environmental conditions will be presented. Comment: Proceedings of the Nuclear Science Symposium and Medical Imaging Conference (IEEE-NSS/MIC), 2013 |
| Databáze: | OpenAIRE |
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