Speaker
Description
Cherenkov detectors are pivotal for particle identification and velocity
measurement in high-energy physics, astrophysics, and neutrino experiments.
Their performance is critically dependent on the efficiency of the optical modules
used to detect Cherenkov photons. Modern Cherenkov detectors have an
incredible active volume like 258 kton of water in Hyper-Kamiokande. The veto
system of Hyper-Kamiokande will have an area of approximately 4800 square
meters and it leads to the need to optimise methods of photon registration. One
of these methods is the use of WLS plates, which allow increasing the light
collection area using an optimal number of 3-inch PMTs. This work presents the
development of optical modules based on a hybrid design integrating PMT and
wavelength-shifting plate. The modules are engineered to maximize photon
capture and collection efficiency and their design focuses on enhancing the
effective photosensitive area. Presented results include production and machining
of WLS plates, various testing methods for plate’s light yield, comparative
performance of WLS plates with different dopants and their concentrations,
studies of the dark rate and aging.
