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The outcomes obtained in laboratory tests, utilizing scintillator bars read by silicon photomultipliers are reported. The present method is the first step for designing a precision tracking system to be positioned inside a free magnetized quantity for the cost identification of low energy crossing particles. The devised system is demonstrated in a position to supply a spatial resolution higher than 2 mm. Scintillators, Photon Solid State detector, particle tracking devices. Among the many planned activities was the development of a gentle spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The entire design needs to be optimised for the dedication of the momentum and charge of muons in 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. 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 supply the necessary spatial decision in reconstructing the position of the crossing particle by profiting of the charge-sharing between adjacent bars readout in analog mode. SiPMs are excellent candidates in replacing standard photomultipliers in many experimental conditions. Tests have been carried out with laser beam pulses and iTagPro official radioactive supply with a purpose to characterize the scintillator bar response and iTagPro official SiPM behaviour. Here we briefly present the noticed behaviour of the SiPM utilized in our assessments concerning the main sources of noise and the impact of temperature on its response and linearity. Several fashions and packaging have been thought-about. The primary supply of noise which limits the SiPM’s single photon resolution is the “dark current” charge. It is originated by cost carriers thermally created in the sensitive quantity and present within the conduction band iTagPro USA and therefore it depends on the temperature. The dependence of the darkish present single pixel fee as a operate of the temperature has been investigated using Peltier cells in order to change and keep the temperature managed.

Dark current price depends additionally on the Vwk as shown in Fig. 3. So as to have low charges of dark current the worth of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is clear that, if needed, ItagPro it can be convenient to use a bias voltage regulator which routinely 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 another indirectly fired by a photon. Optical cross-talk between pixels leads to 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 fee as a function of the temperature. The probability relies upon weakly on the temperature and the measured level of cross-discuss (15-16%) is appropriate with the one reported within the datasheet. SiPM response as soon as its basic parameters and cells configuration are given.

In the Fig. 4 it is proven the pulse height distribution of the darkish current for the SiPM under take a look at. 0.2) mm diameter gap used to lodge a fiber to gather the light. The lateral floor of the scintillator strips is painted with white EJ-510 TiO2 Eljen paint. The scintillation light is collected with 1.2 mm BCF-91A WaveLength Shifter (WLS) fiber produced by the Saint-Gobain Ltd. The WLS is glued into the opening operating alongside the bar and its ends are polished. The read-out is carried out by the SiPM solely at one end and the alternative side is mirrored with reflecting tape to maximize the light assortment. The front-end board prototype devoted to the amplification and iTagPro official SiPM readout has been developed by the Bologna INFN digital group. The current from the SiPM is discharged on the low enter resistance of the transimpedance amplifier