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The outcomes obtained in laboratory exams, utilizing scintillator bars learn by silicon photomultipliers are reported. The current method is step one for designing a precision monitoring system to be placed inside a free magnetized volume for the cost identification of low vitality crossing particles. The devised system is demonstrated in a position to supply a spatial decision higher than 2 mm. Scintillators, Photon Solid State detector, particle tracking gadgets. Among the deliberate actions was the development of a gentle spectrometer seated in a 20-30 m3 magnetized air quantity, the Air Core Magnet (ACM). The whole design needs to be optimised for iTagPro locator the dedication of the momentum and cost of muons in 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 contained in the magnetized air volume. On 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 able to provide the necessary spatial resolution in reconstructing the position of the crossing particle by profiting of the charge-sharing between adjacent bars readout in analog mode. SiPMs are wonderful candidates in replacing commonplace photomultipliers in many experimental conditions. Tests have been performed with laser beam pulses and radioactive supply so as to characterize the scintillator bar response and SiPM behaviour. Here we briefly present the noticed behaviour of the SiPM utilized in our tests regarding the primary sources of noise and the impact of temperature on its response and linearity. Several models and packaging have been thought of. The principle source of noise which limits the SiPM’s single photon resolution is the "dark current" price. It's originated by cost carriers thermally created in the sensitive quantity and current in the conduction band and ItagPro due to this fact it will depend on the temperature. The dependence of the darkish present single pixel fee as a function of the temperature has been investigated utilizing Peltier cells in order to alter and keep the temperature controlled.
Dark present rate relies upon additionally on the Vwk as shown in Fig. 3. As a way to have low charges of dark current the value of Vbias has been fastened at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, if obligatory, it can be convenient to use a bias voltage regulator which robotically 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 leads to a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross speak chance could be obtained by the ratio double-to-single pulse price as a function of the temperature. The likelihood relies upon 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 basic parameters and cells configuration are given.