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The results obtained in laboratory assessments, using scintillator bars learn by silicon photomultipliers are reported. The present approach is step one for designing a precision monitoring system to be placed inside a free magnetized volume for the charge identification of low vitality crossing particles. The devised system is demonstrated ready to offer a spatial decision higher than 2 mm. Scintillators, Photon Solid State detector, particle tracking units. Among the deliberate activities 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 willpower of the momentum and charge 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 contained in 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 offer the mandatory spatial resolution in reconstructing the place of the crossing particle by profiting of the cost-sharing between adjacent bars readout in analog mode. SiPMs are glorious candidates in replacing commonplace photomultipliers in many experimental circumstances. Tests have been performed with laser beam pulses and radioactive supply in order 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 effect of temperature on its response and linearity. Several fashions and packaging have been thought of. The principle supply of noise which limits the SiPM’s single photon resolution is the "dark current" charge. It's originated by cost carriers thermally created in the sensitive quantity and current in the conduction band and iTagPro support due to this fact it will depend on the temperature. The dependence of the darkish present single pixel charge as a operate of the temperature has been investigated utilizing Peltier cells in order to change and keep the temperature managed.
Dark current fee depends additionally on the Vwk as shown in Fig. 3. In an effort to have low rates of dark present the worth of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, if crucial, it may be convenient to make use of a bias voltage regulator which routinely compensates for temperature variations. Not always 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 speak likelihood will be obtained by the ratio double-to-single pulse rate as a perform of the temperature. The likelihood relies upon weakly on the temperature and itagpro bluetooth the measured level of cross-speak (15-16%) is appropriate with the one reported in the datasheet. SiPM response as soon as its basic parameters and cells configuration are given.