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The results obtained in laboratory checks, utilizing scintillator bars read 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 charge identification of low vitality crossing particles. The devised system is demonstrated able to offer a spatial resolution better than 2 mm. Scintillators, Photon Solid State detector, particle tracking units. Among the many planned actions was the construction of a mild spectrometer seated in a 20-30 m3 magnetized air quantity, iTagPro technology the Air Core Magnet (ACM). The entire design ought to be optimised for the dedication of the momentum and cost of muons within 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. 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 here demonstrated able to supply the required 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 excellent candidates in changing commonplace photomultipliers in many experimental situations. Tests have been performed with laser beam pulses and radioactive source with a view to characterize the scintillator bar response and SiPM behaviour. Here we briefly present the noticed behaviour of the SiPM utilized in our tests relating to the main sources of noise and the effect of temperature on its response and linearity. Several fashions and packaging have been considered. The principle supply of noise which limits the SiPM’s single photon resolution is the "dark current" price. It's originated by charge carriers thermally created within the sensitive quantity and current within the conduction band and subsequently it relies on the temperature. The dependence of the darkish present single pixel price as a perform of the temperature has been investigated utilizing Peltier cells so as to change and keep the temperature controlled.
Dark current price depends additionally on the Vwk as proven in Fig. 3. In an effort to have low charges of dark 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 obligatory, ItagPro it can be convenient to make use of 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 another in a roundabout way fired by a photon. Optical cross-speak between pixels leads to a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross speak chance might be obtained by the ratio double-to-single pulse charge as a operate of the temperature. The likelihood relies upon weakly on the temperature and the measured stage of cross-discuss (15-16%) is compatible with the one reported in the datasheet. SiPM response as soon as its primary parameters and cells configuration are given.