Speaker
Dr
Yoshihisa Obayashi
(Kamioka Observatory, ICRR, Univ. of Tokyo)
Description
The Super-Kamiokande detector is a large imaging water Cherenkov
detector with 50 kilotons of pure water viewed by 11,129 20-inch PMT.
Since the observation start in April 1996, Super-Kamiokande has
accumulated atmospheric and solar neutrino data to study
neutrino oscillations and to search for proton decay and neutrinos
from supernovae. Super-Kamiokande has been also used as a far detector
of long-baseline experiments K2K and T2K.
To keep the high quality of wide energy range ( MeV - TeV ) data,
intensive detector calibration work has been performed using
various calibration sources.
Cosmic-ray muons and their decay electrons are used to calibrate
detector energy-scale and to monitor water transparency.
Nitrogen and solid-state lasers are used to calibrate timing
response, to monitor light scattering in water and to estimate
DAQ availability in the case of a high event rate when nearby
supernova occurred.
Xenon lamp and LED are used to monitor stability of PMT gain.
Ni-Cf gamma ray source, D-T neutron source and an electron LINAC
are used to calibrate quantum efficiency of PMT and
to calibrate energy reconstruction on low energy neutrino.
Instrumentation and performance of the detector and its calibration
will be presented. Future prospect of further calibration methods
and their application for next generation detector Hyper-Kamiokande
will be discussed as well.
Author
Dr
Yoshihisa Obayashi
(Kamioka Observatory, ICRR, Univ. of Tokyo)
