Krzysztof Dygnarowicz
supervisor: Janusz Marzec
The aim of my research problem relates to the Hyper Kamiokande (HK) project, which is currently constructed in Japan. Main component of HK is an enormous water-Cherenkov detector (H-71m, Æ=68m), which will be filled with 258 kt of ultrapure water, placed underground at a depth of 650m. The research problems which will be examined by HK include measurements of neutrino oscillation, study of CP-violation, study of cosmic neutrino, proton decay research, dark matter search.
In Poland, we plan to manufacture around 1120 so-called multi-PMT modules – a combined sensor comprising 19 photomultiplier tubes along with associated electronics. These sensors will augment the main photodetection system of the HK, that is built using 50 cm phototubes. The main purpose of the mPMTs will be calibration and they will allow solving some of the degeneracies of the HK detector that would otherwise be impossible to measure (for ex. better study of water properties, better control of direct vs reflected light). Their main advantage compared to 50 cm PMTs are increased granularity, directionality, much better timing resolution. My research task is related to the development of mPMTs modules, which include PMT characterization, developing of data acquisition system (both hardware and digital signal processing algorithms), developing QA scheme and tools for mass production and preparing a model for physics simulations. First pre-production batch of the sensors will be manufactured in 2022.