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The results obtained in laboratory exams, using scintillator bars read by silicon photomultipliers are reported. The present strategy is the first step for iTagPro USA designing a precision tracking system to be placed inside a free magnetized quantity for the cost identification of low power crossing particles. The devised system is demonstrated ready to supply a spatial resolution higher than 2 mm. Scintillators, Photon Solid State detector, particle monitoring units. Among the many planned activities was the construction 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 the willpower of the momentum and cost of muons in the 0.5 - 5 GeV/c vary (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. On this paper we report the results obtained with a small array of triangular scintillator iTagPro technology bars coupled to silicon photomultiplier (SiPM) with wavelength shifter (WLS) fibers.
This bar profile is right here demonstrated able to offer the necessary 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 wonderful candidates in changing customary photomultipliers in lots of experimental conditions. Tests have been carried out with laser beam pulses and ItagPro radioactive supply with a view to characterize the scintillator iTagPro technology bar response and SiPM behaviour. Here we briefly present the noticed behaviour of the SiPM used in our assessments relating to the primary sources of noise and the effect of temperature on its response and linearity. Several fashions and packaging have been thought-about. The primary 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 volume and present within the conduction band and therefore it relies on the temperature. The dependence of the darkish current single pixel price as a perform of the temperature has been investigated using Peltier cells so as to alter and keep the temperature managed.
Dark current rate depends also on the Vwk as shown in Fig. 3. As a way to have low rates of darkish 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 crucial, it may be handy to make use of a bias voltage regulator which robotically compensates for temperature variations. Not at all times the pixels of the SiPM work independently from each other. Photoelectrons (p.e.) can migrate from the hit pixel to a different in a roundabout way 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 likelihood could be obtained by the ratio double-to-single pulse fee as a perform of the temperature. The likelihood relies upon weakly on the temperature and the measured degree of cross-speak (15-16%) is appropriate with the one reported in the datasheet. SiPM response as soon as its fundamental parameters and cells configuration are given.