Speaker
Description
Hyper-Kamiokande is a next-generation water Cherenkov detector currently under construction for the precision measurements of neutrino oscillations and the search for charge-parity symmetry violation. The far detector will contain 260,000 metric tons of ultra-pure water and will be the world’s largest underground neutrino experiment, instrumented with 20,000 20-inch photomultiplier tubes (PMTs) and 800 multi-PMTs. To achieve the required sensitivity, systematic uncertainties must be tightly controlled. A major source of detector systematic uncertainties is the PMT response, in particular the detection efficiency and angular acceptance. This study aims to reduce detector systematic uncertainties by measuring PMT angular response. A method for calibrating PMTs using five diffuse LED light sources integrated into 200 multi-PMTs is presented. A toy data is simulated accounting for the detector geometry, diffuser emission profile, and PMT response characteristics. In the current model PMT angular response is assumed to depend only on the zenith angle of detection. LED intensities and angular response parameters are determined via iterative minimization.
| Keyword-1 | Neutrino physics |
|---|---|
| Keyword-2 | Photomultiplier tubes |