Speaker
Description
The prototype detector of the ICAL experiment at the India-based Neutrino Observatory, the mini-ICAL
is in operation at the IICHEP, Madurai. A Cosmic Muon Veto detector (CMVD) around the mini-ICAL is
being commissioned using extruded plastic scintillators with embedded WLS fibers. The SiPM is used
as a photo-transducer and that will be calibrated using an ultrafast LED driver. Other than the basic
efficiency and gain study for the CMVD as a function of overvoltage ($V_{ov}$), an experimental setup was
designed to characterise the SiPMs in a temperature controlled environment. The readout electronics
involves trans-impedance amplifiers of combined gain 1.24 mV/$\mu$A and a digital storage oscilloscope
for the data collection without much distortion of SiPM signal. Various characteristics of the
Hamamatsu SiPM
(S13360-2050VE), e.g. signal shape, optically correlated and uncorrelated noise, recovery time etc
were studied as a function of $V_{ov}$, number of photoelectrons and the ambient temperature. This
paper will cover the details of those results.
