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Título del libro: Proceedings Of The 33rd International Cosmic Rays Conference, Icrc 2013
Título del capítulo: Characterization of the HAWC R5912 photomultipliers

Autores UNAM:
ROSALIA LANGARICA LEBRE; GERARDO LARA LUCARIO; LUIS ARTEMIO MARTINEZ VAZQUEZ; SILVIO JORGE TINOCO PUERTO; JOSE RUBEN ALFARO MOLINA; ARTURO ISMAEL IRIARTE VALVERDE; ANDRES SANDOVAL ESPINOSA;
Autores externos:

Idioma:
Inglés
Año de publicación:
2013
Palabras clave:

Cosmic rays; Cosmology; Efficiency; Light sources; Photocathodes; Photomultipliers; Hamamatsu; HAWC; High quantum efficiency; Photo multiplier tube (PMTs); Photocathode surfaces; Pulsed light source; R5912; Water Cherenkov detectors; Gamma rays


Resumen:

Each of the 300 water Cherenkov detectors of the HAWC Observatory is instrumented with three 8-inch Hamamatsu R5912 photomultiplier tubes (PMTs) and a central 10-inch Hamamatsu R7081 high quantum efficiency PMT. The 900 R5912 PMTs are reused from the Milagro experiment, which was operated from 2000 to 2008 in the Jemez Mountains near Los Alamos, NM. In order to characterise the present performance of these PMTs, an automatic system was designed and constructed to scan the photocathode surface with a pulsed light source to determine the gain variations at 101 points distributed over the active surface. Gain and efficiency variations over the photocathode surface can be studied with large pulses and with single photo electrons. We find systematic non-uniformities that seem related to the geometry of the entry window into the dynodes. © 2013 Sociedade Brasileira de Fisica. All Rights Reserved.


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