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The results obtained in laboratory assessments, using scintillator bars read by silicon photomultipliers are reported. The current approach is step one for ItagPro designing a precision monitoring system to be placed inside a free magnetized quantity for the cost identification of low energy crossing particles. The devised system is demonstrated ready to offer a spatial resolution higher than 2 mm. Scintillators, Photon Solid State detector, particle tracking units. Among the many planned activities was the construction of a mild spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The whole design ought to be optimised for the determination of the momentum and charge of muons within the 0.5 – 5 GeV/c range (the mis-identification is required to be less 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 here demonstrated able to supply the mandatory spatial decision in reconstructing the place of the crossing particle by profiting of the cost-sharing between adjoining bars readout in analog mode. SiPMs are glorious candidates in changing commonplace photomultipliers in lots of experimental situations. Tests have been performed with laser beam pulses and radioactive source to be able to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the observed behaviour of the SiPM used in our exams relating to the principle sources of noise and the impact of temperature on its response and linearity. Several fashions and packaging have been considered. The principle source of noise which limits the SiPM’s single photon resolution is the “dark current” fee. It’s originated by charge carriers thermally created in the sensitive volume and present within the conduction band and subsequently it is determined by the temperature. The dependence of the dark present single pixel price as a perform of the temperature has been investigated utilizing Peltier cells so as to vary and keep the temperature controlled.
Dark current charge depends also on the Vwk as proven in Fig. 3. With the intention to have low charges of darkish present the worth of Vbias has been fastened at 1.5 V giving a working voltage Vwk of 29 V. It is obvious that, if essential, it may be convenient to make use of a bias voltage regulator which routinely 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-discuss between pixels results in a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross speak chance can be obtained by the ratio double-to-single pulse price as a function of the temperature. The probability relies upon weakly on the temperature and the measured degree of cross-speak (15-16%) is compatible with the one reported within the datasheet. SiPM response as soon as its primary parameters and cells configuration are given.
