Preparatory Study of Photomultiplier Tubes of 10-inch and 3-inch Diameter for KM3NeT Underwater Neutrino Telescope

Conference · Wed Jul 01 00:00:00 EDT 2015

DOI:https://doi.org/10.1109/ANIMMA.2015.7465609· OSTI ID:22531330

Aiello, S.; Giordano, V.; Leonora, E. ^[1]

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1. KM3NeT collaboration, INFN-National Institute of Nuclear Physics, section of Catania, 64 via Santa Sofia, 95123, Catania (Italy)

Large area photomultipliers are widely used in neutrino and astro-particle detectors to measure Cherenkov light in media like water or ice. The key element of these detectors are the so-called 'optical module', which consists of a photodetector enclosed in a transparent pressure-resistant container to protect it and ensure good light transmission. KM3NeT collaboration aims to construct an underwater 'hybrid' neutrino telescope by using two models detection unit. The 'tower' detection unit will be composed of large area 10-inch photomultipliers tube enclosed into 13-inch glass vessel sphere. In the 'string' detection unit instead, the light detector will be the 'digital optical module' (DOM) a glass vessel of 17-inch with 31 photomultipliers of 3- inch diameter looking upwards and downwards. The choice of two different kinds of photomultipliers, obliges us to investigate their main characteristics. Noise pulses at the anode of each photomultiplier strongly affect the performance of the detector. A large study was conducted on noise pulses of large area photomultipliers, considering time and charge distributions of dark pulses, pre-pulses, delayed pulses, and after-pulses. The contribution to noise pulses due to the presence of the external glass vessels was also studied. Moreover the presence of the Earth's magnetic field should modify quantities like gain and transit time spread in photomultipliers and we will deeply investigate on this. (authors)

• Research Organization: Institute of Electrical and Electronics Engineers - IEEE, 3 Park Avenue, 17th Floor, New York, N.Y. 10016-5997 (United States)
• OSTI ID: 22531330
• Report Number(s): ANIMMA-2015-IO-282; TRN: US16V0334102271
• Resource Relation: Conference: ANIMMA 2015: 4. International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications, Lisboa (Portugal), 20-24 Apr 2015; Other Information: Country of input: France; 8 Refs.
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANODES
CHARGE DISTRIBUTION
CHERENKOV COUNTERS
GAIN
GLASS
LIGHT TRANSMISSION
MAGNETIC FIELDS
NEUTRINO DETECTION
NOISE
PHOTODETECTORS
PHOTOMULTIPLIERS
TELESCOPE COUNTERS
TUBES
UNDERWATER
VISIBLE RADIATION
WATER