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The outcomes obtained in laboratory exams, using scintillator bars read by silicon photomultipliers are reported. The present approach is the first step for designing a precision tracking system to be positioned inside a free magnetized volume for the cost identification of low power crossing particles. The devised system is demonstrated able to supply a spatial decision higher than 2 mm. Scintillators, Photon Solid State detector, particle monitoring gadgets. Among the deliberate activities was the construction of a gentle spectrometer seated in a 20-30 m3 magnetized air quantity, the Air Core Magnet (ACM). The whole design should be optimised for the determination of the momentum and cost of muons within the 0.5 - 5 GeV/c range (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 outcomes 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 in a position to provide the mandatory spatial decision in reconstructing the place of the crossing particle by profiting of the charge-sharing between adjacent bars readout in analog mode. SiPMs are glorious candidates in replacing normal photomultipliers in many experimental conditions. Tests have been carried out with laser beam pulses and radioactive source so as to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the observed behaviour of the SiPM utilized in our tests relating to the principle sources of noise and iTagPro reviews the effect of temperature on its response and linearity. Several models and iTagPro portable packaging have been considered. 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 in the sensitive volume and present within the conduction band and due to this fact it depends on the temperature. The dependence of the darkish present single pixel fee as a operate of the temperature has been investigated utilizing Peltier cells in order to vary and keep the temperature controlled.

Dark present rate depends additionally on the Vwk as shown in Fig. 3. In an effort to have low rates of dark current the worth of Vbias has been mounted at 1.5 V giving a working voltage Vwk of 29 V. It is clear that, if crucial, it may be handy to make use of a bias voltage regulator which routinely compensates for temperature variations. Not all the time the pixels of the SiPM work independently from one another. Photoelectrons (p.e.) can migrate from the hit pixel to a different circuitously 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 discuss likelihood could be obtained by the ratio double-to-single pulse charge as a function of the temperature. The probability depends weakly on the temperature and the measured stage of cross-speak (15-16%) is suitable with the one reported within the datasheet. SiPM response once its basic parameters and cells configuration are given.