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The outcomes obtained in laboratory tests, using scintillator bars learn by silicon photomultipliers are reported. The present method is step one for designing a precision monitoring system to be placed inside a free magnetized volume for the cost identification of low energy crossing particles. The devised system is demonstrated in a position to offer a spatial decision better than 2 mm. Scintillators, Photon Solid State detector, particle monitoring gadgets. Among the many planned actions was the development of a light spectrometer seated in a 20-30 m3 magnetized air quantity, the Air Core Magnet (ACM). The whole design needs to be optimised for the determination of the momentum and charge of muons within 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 quantity. On this paper we report the results obtained with a small array of triangular scintillator iTagPro USA bars coupled to silicon photomultiplier (SiPM) with wavelength shifter (WLS) fibers.

This bar profile is here demonstrated ready to supply the mandatory spatial decision in reconstructing the place of the crossing particle by profiting of the charge-sharing between adjoining bars readout in analog mode. SiPMs are excellent candidates in replacing commonplace photomultipliers in many experimental situations. Tests have been carried out with laser beam pulses and radioactive source with a view to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the noticed behaviour of the SiPM utilized in our checks concerning the principle sources of noise and the impact of temperature on its response and linearity. Several models and packaging have been thought-about. The primary supply of noise which limits the SiPM’s single photon resolution is the "dark current" rate. It is originated by cost carriers thermally created in the sensitive quantity and current within the conduction band and subsequently it will depend on the temperature. The dependence of the dark current single pixel price as a perform of the temperature has been investigated utilizing Peltier cells in order to vary and keep the temperature controlled.

Dark current charge depends also on the Vwk as proven in Fig. 3. With a purpose to have low charges of dark present the worth of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is obvious that, if obligatory, it can be handy to use a bias voltage regulator which routinely compensates for temperature variations. Not always the pixels of the SiPM work independently from each other. Photoelectrons (p.e.) can migrate from the hit pixel to a different circuitously fired by a photon. Optical cross-talk between pixels results in a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross discuss chance might be obtained by the ratio double-to-single pulse rate as a function of the temperature. The chance relies upon weakly on the temperature and the measured stage of cross-talk (15-16%) is appropriate with the one reported within the datasheet. SiPM response as soon as its primary parameters and cells configuration are given.