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The outcomes obtained in laboratory tests, using scintillator bars read by silicon photomultipliers are reported. The current strategy is the first step for ItagPro designing a precision monitoring system to be placed inside a free magnetized volume for the charge identification of low energy crossing particles. The devised system is demonstrated able to provide a spatial resolution higher than 2 mm. Scintillators, Photon Solid State detector, particle monitoring units. Among the many planned activities was the construction 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 willpower of the momentum and charge 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 offer the necessary 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 wonderful candidates in replacing normal photomultipliers in many experimental conditions. Tests have been performed with laser beam pulses and radioactive supply with a view to characterize the scintillator anti-loss gadget bar response and SiPM behaviour. Here we briefly present the observed 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 principle source of noise which limits the SiPM’s single photon resolution is the "dark current" price. It is originated by cost carriers thermally created within the delicate volume and geofencing alert tool present in the conduction band and subsequently it is dependent upon the temperature. The dependence of the dark current single pixel rate as a perform of the temperature has been investigated using Peltier cells so as to change and keep the temperature controlled.

Dark present charge depends also on the Vwk as proven in Fig. 3. As a way to have low rates of darkish present the worth of Vbias has been mounted at 1.5 V giving a working voltage Vwk of 29 V. It is obvious that, if essential, it may be handy to make use of a bias voltage regulator which mechanically 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 not directly fired by a photon. Optical cross-discuss between pixels results in a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross speak chance will be obtained by the ratio double-to-single pulse fee as a function of the temperature. The probability relies upon weakly on the temperature and ItagPro the measured level of cross-discuss (15-16%) is appropriate with the one reported within the datasheet. SiPM response once its basic parameters and cells configuration are given.