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The results obtained in laboratory exams, utilizing scintillator track lost luggage bars learn by silicon photomultipliers are reported. The present strategy is step one for designing a precision tracking system to be positioned inside a free magnetized quantity for the charge identification of low energy crossing particles. The devised system is demonstrated able to provide a spatial resolution higher than 2 mm. Scintillators, track lost luggage Photon Solid State detector, particle tracking devices. Among the many planned 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 needs to be optimised for track lost luggage the willpower of the momentum and track lost luggage charge of muons within 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 inside the magnetized air volume. On 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 mandatory 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 glorious candidates in replacing customary photomultipliers in many experimental circumstances. Tests have been performed with laser beam pulses and radioactive source in order to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the noticed behaviour of the SiPM utilized in our exams regarding the principle sources of noise and the impact of temperature on its response and linearity. Several fashions and track lost luggage packaging have been thought of. The main source of noise which limits the SiPM’s single photon resolution is the "dark current" price. It is originated by cost carriers thermally created within the delicate quantity and iTagPro bluetooth tracker current within the conduction band and due to this fact it is dependent upon the temperature. The dependence of the dark present single pixel price as a perform of the temperature has been investigated using Peltier cells in order to alter and keep the temperature controlled.

Dark current fee relies upon also on the Vwk as shown in Fig. 3. To be able to have low rates of darkish present the worth of Vbias has been mounted at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, if needed, it can be convenient to make use of a bias voltage regulator which robotically compensates for temperature variations. Not always the pixels of the SiPM work independently from one another. Photoelectrons (p.e.) can migrate from the hit pixel to another 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 talk chance will be obtained by the ratio double-to-single pulse price as a function of the temperature. The likelihood depends weakly on the temperature and the measured stage of cross-speak (15-16%) is compatible with the one reported within the datasheet. SiPM response once its fundamental parameters and cells configuration are given.

In the Fig. Four it is proven the pulse height distribution of the darkish current for the SiPM underneath take a look at. 0.2) mm diameter hole 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 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 working alongside the bar and its ends are polished. The read-out is carried out by the SiPM solely at one finish and the other side is mirrored with reflecting tape to maximize the light assortment. The front-finish board prototype dedicated to the amplification and SiPM readout has been developed by the Bologna INFN electronic group. The current from the SiPM is discharged on the low input resistance of the transimpedance amplifier; this offers small time constants, that is, quick signal rise time (using the OPA 656N with a 500 MHz bandwidth we receive alerts with 20-30 ns of rise time).