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The results obtained in laboratory assessments, using scintillator bars learn by silicon photomultipliers are reported. The current method is the first step for designing a precision tracking system to be positioned inside a free magnetized quantity for the charge identification of low vitality crossing particles. The devised system is demonstrated able to provide a spatial decision better than 2 mm. Scintillators, Photon Solid State detector, particle monitoring devices. Among the deliberate actions was the development of a light spectrometer seated in a 20-30 m3 magnetized air quantity, the Air Core Magnet (ACM). The entire design must 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 less than 3% at 0.5 GeV/c). 1.5 mm is required inside 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 right here demonstrated in a position to offer the mandatory spatial resolution in reconstructing the place of the crossing particle by profiting of the charge-sharing between adjacent bars readout in analog mode. SiPMs are excellent candidates in changing commonplace 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 exams 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" charge. It's originated by charge carriers thermally created within the sensitive volume and current within the conduction band and iTagPro reviews due to this fact it depends on the temperature. The dependence of the dark present single pixel fee as a operate of the temperature has been investigated using Peltier cells so as to alter and keep the temperature controlled.



Dark current fee relies upon additionally on the Vwk as proven in Fig. 3. With a view to have low charges of dark current the worth of Vbias has been fastened at 1.5 V giving a working voltage Vwk of 29 V. It is clear that, if necessary, it can be handy to make use of a bias voltage regulator luggage tracking device which mechanically compensates for temperature variations. Not all the time the pixels of the SiPM work independently from one another. Photoelectrons (p.e.) can migrate from the hit pixel to another circuitously 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 talk probability can be obtained by the ratio double-to-single pulse charge as a perform of the temperature. The chance depends weakly on the temperature and iTagPro reviews the measured stage of cross-discuss (15-16%) is appropriate with the one reported within the datasheet. SiPM response once its primary parameters and cells configuration are given.



Within the Fig. 4 it's shown the pulse height distribution of the darkish current for the SiPM beneath 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 mild 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 running along the bar and its ends are polished. The read-out is carried out by the SiPM solely at one end and the other aspect is mirrored with reflecting tape to maximize the light collection. The front-finish board prototype devoted to the amplification and SiPM readout has been developed by the Bologna INFN electronic group. The present from the SiPM is discharged on the low input resistance of the transimpedance amplifier; this gives small time constants, that is, quick sign rise time (using the OPA 656N with a 500 MHz bandwidth we get hold of signals with 20-30 ns of rise time).