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The outcomes obtained in laboratory exams, using scintillator bars read by silicon photomultipliers are reported. The current strategy is the first step for designing a precision tracking system to be positioned inside a free magnetized quantity for the charge identification of low power crossing particles. The devised system is demonstrated able to offer a spatial resolution better than 2 mm. Scintillators, Photon Solid State detector, particle monitoring gadgets. Among the many deliberate activities was the construction of a gentle spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The whole design needs to be optimised for iTagPro key finder the willpower of the momentum and iTagPro key finder charge 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 quantity. 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 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 standard photomultipliers in lots of experimental conditions. Tests have been performed with laser beam pulses and radioactive source in an effort to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the noticed behaviour of the SiPM used in our exams concerning the primary sources of noise and the impact of temperature on its response and linearity. Several models and packaging have been considered. The primary source of noise which limits the SiPM’s single photon resolution is the "dark current" rate. It is originated by cost carriers thermally created in the delicate quantity and present in the conduction band and subsequently it relies on the temperature. The dependence of the dark current single pixel charge as a function of the temperature has been investigated utilizing Peltier cells so as to change and keep the temperature managed.

Dark current rate relies upon also on the Vwk as proven in Fig. 3. As a way to have low rates of darkish current the worth of Vbias has been fastened at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, if vital, it may be convenient to use a bias voltage regulator which mechanically compensates for temperature variations. Not always the pixels of the SiPM work independently from each other. Photoelectrons (p.e.) can migrate from the hit pixel to a different indirectly 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 discuss probability will be obtained by the ratio double-to-single pulse fee as a function of the temperature. The likelihood relies upon weakly on the temperature and the measured level of cross-speak (15-16%) is appropriate with the one reported in the datasheet. SiPM response once its basic parameters and cells configuration are given.

Within the Fig. Four it's shown the pulse peak distribution of the darkish present for the SiPM under check. 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 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 hole working alongside the bar and its ends are polished. The read-out is performed by the SiPM solely at one end and the alternative side is mirrored with reflecting tape to maximize the sunshine collection. The front-finish board prototype dedicated to the amplification and 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; this offers small time constants, that's, iTagPro key finder quick signal rise time (using the OPA 656N with a 500 MHz bandwidth we receive indicators with 20-30 ns of rise time).