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The outcomes obtained in laboratory tests, utilizing scintillator bars learn by silicon photomultipliers are reported. The current method is the first step for designing a precision tracking system to be placed inside a free magnetized volume for the cost 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 gadgets. Among the planned activities was the construction of a gentle spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The entire design should be optimised for ItagPro the willpower of the momentum and cost of muons within the 0.5 - 5 GeV/c range (the mis-identification is required to be less than 3% at 0.5 GeV/c). 1.5 mm is required inside the magnetized air quantity. On 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 right here demonstrated ready to offer the mandatory 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 glorious candidates in replacing standard photomultipliers in lots of experimental conditions. Tests have been carried out with laser beam pulses and radioactive supply in an effort to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the observed behaviour of the SiPM utilized in our assessments regarding the main sources of noise and the impact of temperature on its response and linearity. Several models and packaging have been thought of. The primary supply of noise which limits the SiPM’s single photon resolution is the "dark current" price. It's originated by charge carriers thermally created within the sensitive volume and current in the conduction band and therefore it will depend on the temperature. The dependence of the darkish 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 depends also on the Vwk as shown in Fig. 3. In order 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 clear that, if essential, it can be handy to use a bias voltage regulator which mechanically compensates for temperature variations. Not all the time the pixels of the SiPM work independently from each other. 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 discuss likelihood may be obtained by the ratio double-to-single pulse rate as a operate of the temperature. The chance depends weakly on the temperature and the measured stage of cross-talk (15-16%) is compatible with the one reported within the datasheet. SiPM response once its fundamental parameters and cells configuration are given.