Speaker
Description
A Cosmic Muon Veto detector (CMVD) is being set up at TIFR for the feasibility study of
atmospheric neutrino experiment at the shallow depth.
The commissioning work of this CMVD on top of the 12 layer RPC stack at TIFR is being done
using four layers of extruded plastic scintillators with embedded WLS fibers and the SiPM as a photo-transducer.
The target goal of the CMVD is of efficiency more than 99\% in each layer and a fraction of false veto
less than $10^{-5}$. A good understanding of the noise rate of the SiPM is crucial to achieve this goal.
Though Hamamatsu SiPM (S13360-2050VE) is used for the CMVD system, different varieties of SiPMs from
different vendors of sizes $2\,mm\times 2\,mm$, $3\,mm\times 3\,mm$ $4\,mm\times 4\,mm$ and
$6\,mm\times 6\,mm$ are tested to understand the various types of correlated and uncorrelated noise
properties of SiPMs. A comprehensive study of these noise rates at different over voltages and temperatures
of a few SiPM from different foundries as well as size will be presented in the paper.
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