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 was
planned using extruded plastic scintillators with embedded WLS fibers. A similar system is being
commissioned at TIFR. 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. From the point of view of avalanche formation, the rise time of the
SiPM signals should be independent of the temperature and to some extent with the operational
overvoltage ($V_{ov}$), but the observations show variations as a function of those two parameters.
Various characteristics of the signal shape, recovery time etc were studied as a function of
$V_{ov}$ and the ambient temperature. This paper will cover the details of those results and possible
explanations of those variations.
| Field of contribution | Experiment |
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