A system for the characterization of the HAWC PMTs sensitivity

R. Langarica; G. Lara; L. A. Martinez; S. Tinoco; R. Alfaro; A. Iriarte; A. Sandoval; P. Vanegas

doi:10.1117/12.925661

25 September 2012 A system for the characterization of the HAWC PMTs sensitivity

R. Langarica, G. Lara, L. A. Martinez, S. Tinoco, R. Alfaro, A. Iriarte, A. Sandoval, P. Vanegas

Proceedings Volume 8453, High Energy, Optical, and Infrared Detectors for Astronomy V; 845334 (2012) https://doi.org/10.1117/12.925661
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The HAWC Project is a very high-energy gamma-ray observatory under construction at the Sierra Negra volcano (4100 meters above sea level) in the Pico de Orizaba National Park located in central Mexico. HAWC will reuse the 900 Hamamatsu R5912 photomultipliers (PMTs) from Milagro Observatory for the 300 Water Cherenkov Detectors. In order to characterize their present performance it is necessary to scan the active area of the photocathode by measuring its efficiency and gain. A characterization system was designed and manufactured to achieve an automated measurement of over 100 points distributed on the PMT active spherical surface. Preliminary results show the variation of QE of PMTs with respect of the position of incoming photons, as well as the changes in the PMTs response due to the Earth's magnetic field and gain vs. high voltage. The system allows automated PMT characterization improving its performance, reliability, precision and repeatability. In this work we present the characterization system and preliminary results on the PMT efficiency.

Citation Download Citation

R. Langarica, G. Lara, L. A. Martinez, S. Tinoco, R. Alfaro, A. Iriarte, A. Sandoval, and P. Vanegas "A system for the characterization of the HAWC PMTs sensitivity", Proc. SPIE 8453, High Energy, Optical, and Infrared Detectors for Astronomy V, 845334 (25 September 2012); https://doi.org/10.1117/12.925661

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