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The results obtained in laboratory exams, using scintillator bars learn by silicon photomultipliers are reported. The present method is the first step for designing a precision monitoring system to be positioned inside a free magnetized volume for the cost identification of low power crossing particles. The devised system is demonstrated in a position to provide a spatial resolution higher than 2 mm. Scintillators, Photon Solid State detector, particle monitoring gadgets. Among the many deliberate activities was the development of a mild spectrometer seated in a 20-30 m3 magnetized air quantity, the Air Core Magnet (ACM). The whole design should be optimised for the determination of the momentum and charge of muons in the 0.5 – 5 GeV/c range (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 iTagPro support bars coupled to silicon photomultiplier (SiPM) with wavelength shifter (WLS) fibers.

This bar profile is right here demonstrated ready to supply the mandatory 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 glorious candidates in changing customary photomultipliers in many experimental situations. Tests have been performed with laser beam pulses and radioactive supply so as to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the noticed behaviour of the SiPM utilized in our checks concerning the principle sources of noise and the effect of temperature on its response and linearity. Several models and packaging have been thought of. The main source of noise which limits the SiPM’s single photon decision is the “dark current” fee. It is originated by charge carriers thermally created within the delicate volume and current in the conduction band and therefore it depends upon the temperature. The dependence of the dark current single pixel charge as a operate of the temperature has been investigated using Peltier cells in order to alter and keep the temperature managed.

Dark present price depends additionally on the Vwk as shown in Fig. 3. In an effort to have low rates of dark present the value of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is clear that, if necessary, it can be convenient to make use of a bias voltage regulator which mechanically 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 a different not directly fired by a photon. Optical cross-speak 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 operate of the temperature. The probability relies upon weakly on the temperature and the measured stage of cross-talk (15-16%) is compatible with the one reported within the datasheet. SiPM response as soon as its fundamental parameters and cells configuration are given.

In the Fig. 4 it’s shown the pulse top distribution of the dark current for the SiPM below test. 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 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 outlet operating along the bar and its ends are polished. The learn-out is carried out by the SiPM solely at one end and the other aspect is mirrored with reflecting tape to maximize the light assortment. The entrance-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 offers small time constants, that is, quick sign rise time (using the OPA 656N with a 500 MHz bandwidth we obtain indicators with 20-30 ns of rise time).