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The results obtained in laboratory exams, utilizing scintillator bars read by silicon photomultipliers are reported. The present method is step one for iTagPro geofencing designing a precision tracking system to be positioned inside a free magnetized volume for the charge identification of low energy crossing particles. The devised system is demonstrated in a position to offer a spatial resolution better than 2 mm. Scintillators, Photon Solid State detector, particle tracking units. Among the planned activities was the development of a mild spectrometer seated in a 20-30 m3 magnetized air volume, iTagPro geofencing 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 lower than 3% at 0.5 GeV/c). 1.5 mm is required contained in the magnetized air volume. On 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 in a position to supply the required spatial resolution in reconstructing the place of the crossing particle by profiting of the cost-sharing between adjoining bars readout in analog mode. SiPMs are excellent candidates in changing normal photomultipliers in lots of experimental situations. Tests have been performed with laser beam pulses and radioactive source as a way to characterize the scintillator bar response and SiPM behaviour. Here we briefly present the noticed behaviour of the SiPM used in our checks regarding the main sources of noise and the effect of temperature on its response and iTagPro geofencing linearity. Several models and packaging have been thought of. The primary source of noise which limits the SiPM’s single photon resolution is the "dark current" price. It is originated by cost carriers thermally created in the sensitive quantity and current in the conduction band and subsequently it is dependent upon the temperature. The dependence of the dark present single pixel rate as a operate of the temperature has been investigated utilizing Peltier cells in order to alter and keep the temperature controlled.

Dark current fee relies upon also on the Vwk as shown in Fig. 3. In order to have low rates of dark current the value of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is clear that, if vital, it may be handy to use 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 a different circuitously 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 can be obtained by the ratio double-to-single pulse charge as a perform of the temperature. The likelihood relies upon weakly on the temperature and the measured degree of cross-speak (15-16%) is suitable with the one reported within the datasheet. SiPM response as soon as its fundamental parameters and cells configuration are given.

Within the Fig. 4 it's proven the pulse top distribution of the darkish current for the SiPM under take a look at. 0.2) mm diameter hole used to lodge a fiber to gather the sunshine. The lateral floor of the scintillator strips is painted with white EJ-510 TiO2 Eljen paint. The scintillation gentle is collected with 1.2 mm BCF-91A WaveLength Shifter (WLS) fiber produced by the Saint-Gobain Ltd. The WLS is glued into the hole operating alongside the bar and its ends are polished. The learn-out is carried out by the SiPM only at one end and iTagPro technology the other facet is mirrored with reflecting tape to maximize the sunshine collection. The front-finish board prototype devoted to the amplification and SiPM readout has been developed by the Bologna INFN electronic group. The current from the SiPM is discharged on the low input resistance of the transimpedance amplifier; this gives small time constants, that's, fast signal rise time (using the OPA 656N with a 500 MHz bandwidth we get hold of alerts with 20-30 ns of rise time).