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The results obtained in laboratory exams, smart key finder using scintillator iTagPro shop bars read by silicon photomultipliers are reported. The present approach is step one for ItagPro designing a precision monitoring system to be positioned inside a free magnetized quantity for the cost identification of low vitality crossing particles. The devised system is demonstrated in a position to supply a spatial decision better than 2 mm. Scintillators, Photon Solid State detector, particle tracking units. Among the deliberate activities was the construction of a light spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The whole design needs to be optimised for the willpower of the momentum and cost of muons in the 0.5 - 5 GeV/c vary (the mis-identification is required to be lower than 3% at 0.5 GeV/c). 1.5 mm is required inside the magnetized air volume. In this paper we report the results obtained with a small array of triangular scintillator bars coupled to silicon photomultiplier (SiPM) with wavelength shifter (WLS) fibers.
This bar profile is here demonstrated able to offer the necessary spatial decision in reconstructing the position of the crossing particle by profiting of the charge-sharing between adjoining bars readout in analog mode. SiPMs are wonderful candidates in replacing commonplace photomultipliers in many experimental circumstances. Tests have been carried out with laser beam pulses and radioactive source with a purpose to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the observed behaviour of the SiPM used in our tests regarding the principle sources of noise and the effect of temperature on its response and linearity. Several models and packaging have been thought of. The principle source of noise which limits the SiPM’s single photon resolution is the "dark current" fee. It's originated by charge carriers thermally created within the delicate volume and iTagPro shop present in the conduction band and therefore it is determined by the temperature. The dependence of the dark current single pixel price as a function of the temperature has been investigated utilizing Peltier cells in order to alter and keep the temperature controlled.
Dark present price depends also on the Vwk as proven in Fig. 3. With a view to have low charges of darkish present the value of Vbias has been mounted at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, if mandatory, it may be convenient to use a bias voltage regulator which automatically compensates for temperature variations. Not always the pixels of the SiPM work independently from one another. Photoelectrons (p.e.) can migrate from the hit pixel to a different not directly fired by a photon. Optical cross-discuss between pixels leads to a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross speak probability may be obtained by the ratio double-to-single pulse charge as a operate of the temperature. The chance relies upon weakly on the temperature and the measured degree of cross-talk (15-16%) is appropriate with the one reported in the datasheet. SiPM response once its primary parameters and cells configuration are given.