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The results obtained in laboratory checks, utilizing scintillator bars learn 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 ItagPro the charge identification of low power crossing particles. The devised system is demonstrated in a position to supply a spatial resolution better than 2 mm. Scintillators, Photon Solid State detector, particle monitoring gadgets. Among the planned actions was the development of a gentle spectrometer seated in a 20-30 m3 magnetized air quantity, the Air Core Magnet (ACM). The entire design should 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 less than 3% at 0.5 GeV/c). 1.5 mm is required inside the magnetized air quantity. 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 right here demonstrated able to supply the mandatory spatial resolution in reconstructing the place of the crossing particle by profiting of the charge-sharing between adjoining bars readout in analog mode. SiPMs are glorious candidates in replacing normal photomultipliers in many 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 present the noticed behaviour of the SiPM utilized in our tests regarding the primary sources of noise and the effect of temperature on its response and linearity. Several models and packaging have been considered. The principle 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 volume and present in the conduction band and therefore it is determined by the temperature. The dependence of the darkish current single pixel rate as a operate of the temperature has been investigated using Peltier cells so as to alter and keep the temperature managed.
Dark current rate depends additionally on the Vwk as proven in Fig. 3. So as 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 clear that, if essential, it may be handy to make use of 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 in a roundabout way 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 chance might be obtained by the ratio double-to-single pulse rate as a function of the temperature. The likelihood depends weakly on the temperature and the measured level of cross-talk (15-16%) is compatible with the one reported within the datasheet. SiPM response once its primary parameters and cells configuration are given.
Within the Fig. Four it's shown the pulse top distribution of the darkish current for the SiPM below take a look at. 0.2) mm diameter gap used to lodge a fiber to collect the sunshine. The lateral surface 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 outlet running alongside the bar and its ends are polished. The read-out is performed by the SiPM solely at one end and the alternative facet is mirrored with reflecting tape to maximise the light assortment. 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 input resistance of the transimpedance amplifier