20.500.12556/DKUM-66979 Particle identification performance of the prototype aerogel RICH counter for the Belle II experiment We have developed a new type of particle identification device, called an aerogel ring imaging Cherenkov (ARICH) counter, for the Belle II experiment. It uses silica aerogel tiles as Cherenkov radiators. For detection of Cherenkov photons, hybrid avalanche photo-detectors (HAPDs) are used. The designed HAPD has a high sensitivity to single photons under a strong magnetic field. We have confirmed that the HAPD provides high efficiency for single-photon detection even after exposure to neutron and $\gamma$-ray radiation that exceeds the levels expected in the 10-year Belle II operation. In order to confirm the basic performance of the ARICH counter system, we carried out a beam test at the using a prototype of the ARICH counter with six HAPD modules. The results are in agreement with our expectations and confirm the suitability of the ARICH counter for the Belle II experiment. Based on the in-beam performance of the device, we expect that the identification efficiency at $3.5\,{\rm GeV}/c$ is 97.4% and 4.9% for pions and kaons, respectively. This paper summarizes the development of the HAPD for the ARICH and the evaluation of the performance of the prototype ARICH counter built with the final design components. H14 elementary particle physics particle detectors Belle II detector ring imaging Cherenkov counters RICH counters H14 fizika osnovnih delcev detektorji delcev detektor Belle II števci 'ring imaging Cherenkov' števci RICH true false true Angleški jezik Slovenski jezik Znanstveno delo 2017-07-21 13:13:44 2017-07-21 13:14:57 2022-08-01 13:24:42 2019-07-11 16:05:23 2016 0 0 str. 1-16 št. 3 Letn. 2016 2016 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2050-3911 539.1.074 2704635 2941284 10.1093/ptep/ptw005 2050-3911 URN:SI:UM:DK:R3GHFCKP Progress_of_Theoretical_and_Experimental_Physics_2016_Iwata_et_al._Particle_identification_performance_of_the_prototype_aerogel_RICH_cou.pdf Progress_of_Theoretical_and_Experimental_Physics_2016_Iwata_et_al._Particle_identification_performance_of_the_prototype_aerogel_RICH_cou.pdf 1 EF1F114E71D56770A33AC656E7ECDF8D 509f14c9c9968355e2d0bc97fd627c011b1f6bf619406d81ef82a0d71d4e3e05 709f1194-7c0e-11eb-bb7a-00155d0001ca 20.500.12556/dkum/10cc689a-158f-4ce0-a50f-1107b7362e4c https://dk.um.si/Dokument.php?lang=slv&id=114447 https://academic.oup.com/ptep/article-lookup/doi/10.1093/ptep/ptw005 1 https://dk.um.si/Dokument.php?lang=slv&id=114446 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0