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The results obtained in laboratory assessments, utilizing scintillator bars read by silicon photomultipliers are reported. The present strategy is step one for designing a precision tracking system to be positioned inside a free magnetized volume for the cost identification of low energy crossing particles. The devised system is demonstrated able to offer a spatial decision better than 2 mm. Scintillators, Photon Solid State detector, particle monitoring units. Among the planned activities was the development of a gentle spectrometer seated in a 20-30 m3 magnetized air quantity, the Air Core Magnet (ACM). The entire design must be optimised for the dedication of the momentum and cost of muons within the 0.5 - 5 GeV/c vary (the mis-identification is required to be less 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 provide the necessary spatial resolution in reconstructing the position of the crossing particle by profiting of the cost-sharing between adjoining bars readout in analog mode. SiPMs are wonderful candidates in replacing commonplace photomultipliers in lots of experimental circumstances. Tests have been carried out with laser beam pulses and radioactive supply with a view to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the observed behaviour of the SiPM utilized in our checks regarding the main 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 cost carriers thermally created in the sensitive quantity and present within the conduction band and therefore it relies on the temperature. The dependence of the dark current single pixel charge as a function of the temperature has been investigated using Peltier cells so as to vary and keep the temperature managed.

Dark present fee relies upon also on the Vwk as proven in Fig. 3. With a view to have low charges of dark present the value of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, if crucial, it can be convenient to use a bias voltage regulator which robotically 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 another in a roundabout way fired by a photon. Optical cross-speak between pixels results in a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross talk probability may be obtained by the ratio double-to-single pulse rate as a operate of the temperature. The likelihood relies upon weakly on the temperature and the measured stage of cross-discuss (15-16%) is compatible with the one reported within the datasheet. SiPM response as soon as its basic parameters and cells configuration are given.