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The results obtained in laboratory exams, utilizing scintillator bars learn by silicon photomultipliers are reported. The present method is the first step for designing a precision monitoring system to be placed inside a free magnetized quantity for the cost identification of low vitality 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 units. 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 should be optimised for the determination of the momentum and cost of muons in 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 contained in the magnetized air quantity. In this paper we report the results obtained with a small array of triangular scintillator ItagPro bars coupled to silicon photomultiplier (SiPM) with wavelength shifter (WLS) fibers.

This bar profile is right here demonstrated in a position to offer the necessary spatial decision in reconstructing the position of the crossing particle by profiting of the cost-sharing between adjacent bars readout in analog mode. SiPMs are glorious candidates in replacing customary photomultipliers in many experimental circumstances. Tests have been carried out with laser beam pulses and radioactive source to be able to characterize the scintillator bar response and SiPM behaviour. Here we briefly present the observed behaviour of the SiPM used in our checks concerning the principle sources of noise and the impact of temperature on its response and linearity. Several fashions and iTagPro tracker packaging have been thought of. The primary supply of noise which limits the SiPM’s single photon decision is the "dark current" price. It is originated by cost carriers thermally created in the delicate quantity and current within the conduction band and due to this fact it depends upon the temperature. The dependence of the darkish present single pixel fee as a function of the temperature has been investigated utilizing Peltier cells so as to alter and keep the temperature managed.

Dark present rate depends additionally on the Vwk as shown in Fig. 3. As a way to have low charges of darkish current the value of Vbias has been mounted at 1.5 V giving a working voltage Vwk of 29 V. It is obvious that, if crucial, it can be convenient to use a bias voltage regulator which automatically compensates for temperature variations. Not all the time 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 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 rate as a function of the temperature. The chance depends weakly on the temperature and the measured degree of cross-speak (15-16%) is suitable with the one reported within the datasheet. SiPM response as soon as its fundamental parameters and cells configuration are given.