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The results obtained in laboratory tests, utilizing scintillator bars read by silicon photomultipliers are reported. The current method is the first step for designing a precision tracking system to be placed inside a free magnetized volume for the charge identification of low energy 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 deliberate actions was the construction of a gentle 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 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 quantity. 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 right here demonstrated in a position to supply the required 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 many experimental situations. Tests have been carried out 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 assessments regarding the principle sources of noise and ItagPro the effect of temperature on its response and linearity. Several fashions and packaging have been considered. The primary source of noise which limits the SiPM’s single photon decision is the "dark current" fee. It is originated by cost carriers thermally created within the sensitive volume and current within the conduction band and due to this fact it is determined by the temperature. The dependence of the dark current single pixel fee as a operate of the temperature has been investigated utilizing Peltier cells so as to vary and keep the temperature controlled.
Dark present price relies upon also on the Vwk as proven in Fig. 3. As a way to have low charges 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 essential, it may 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 one another. Photoelectrons (p.e.) can migrate from the hit pixel to a different circuitously fired by a photon. Optical cross-discuss between pixels results in a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross talk probability could 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 degree of cross-discuss (15-16%) is appropriate with the one reported in the datasheet. SiPM response as soon as its fundamental parameters and cells configuration are given.