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The outcomes obtained in laboratory tests, 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 quantity for the cost identification of low energy crossing particles. The devised system is demonstrated able to offer a spatial decision better than 2 mm. Scintillators, Photon Solid State detector, particle tracking devices. Among the many planned actions was the development of a gentle spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The whole design needs to be optimised for the determination of the momentum and charge of muons within the 0.5 - 5 GeV/c vary (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. In 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 required spatial resolution in reconstructing the place of the crossing particle by profiting of the cost-sharing between adjoining bars readout in analog mode. SiPMs are excellent candidates in changing commonplace photomultipliers in lots of experimental circumstances. Tests have been performed with laser beam pulses and radioactive supply as a way to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the noticed behaviour of the SiPM used in our exams concerning the main sources of noise and the impact of temperature on its response and linearity. Several models and packaging have been thought of. The primary source of noise which limits the SiPM’s single photon resolution is the "dark current" charge. It is originated by charge carriers thermally created within the sensitive quantity and current within the conduction band and subsequently it depends on the temperature. The dependence of the darkish current single pixel price as a perform of the temperature has been investigated utilizing Peltier cells so as to change and keep the temperature managed.



Dark present price relies upon also on the Vwk as proven in Fig. 3. In order to have low rates of dark present the value of Vbias has been fastened at 1.5 V giving a working voltage Vwk of 29 V. It is obvious that, if obligatory, it may be handy to use a bias voltage regulator which automatically 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 indirectly 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 discuss probability will be obtained by the ratio double-to-single pulse fee as a perform of the temperature. The likelihood depends weakly on the temperature and the measured stage of cross-speak (15-16%) is suitable with the one reported within the datasheet. SiPM response once its basic parameters and cells configuration are given.