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The results obtained in laboratory tests, using scintillator bars learn by silicon photomultipliers are reported. The present strategy is step one for designing a precision tracking system to be positioned inside a free magnetized volume for the charge identification of low power crossing particles. The devised system is demonstrated ready to offer a spatial decision higher than 2 mm. Scintillators, iTagPro features Photon Solid State detector, particle tracking devices. Among the planned activities was the construction of a mild spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The entire design needs to be optimised for the dedication of the momentum and charge 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 outcomes 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 provide 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 glorious candidates in replacing normal photomultipliers in lots of experimental situations. Tests have been performed with laser beam pulses and radioactive source with a view to characterize the scintillator bar response and iTagPro smart device SiPM behaviour. Here we briefly current the noticed behaviour of the SiPM utilized in our tests regarding the primary sources of noise and iTagPro smart device the impact of temperature on its response and ItagPro 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" charge. It is originated by charge carriers thermally created in the delicate volume and present within the conduction band and iTagPro smart device due to this fact it is dependent upon the temperature. The dependence of the darkish current single pixel price as a perform of the temperature has been investigated utilizing Peltier cells so as to vary and keep the temperature controlled.
Dark current fee depends additionally on the Vwk as proven in Fig. 3. With a view to have low rates of darkish present the worth of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, iTagPro smart device if vital, 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 leads to a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross discuss likelihood can be obtained by the ratio double-to-single pulse price as a perform of the temperature. The likelihood depends weakly on the temperature and iTagPro smart device the measured degree of cross-speak (15-16%) is appropriate with the one reported in the datasheet. SiPM response as soon as its primary parameters and cells configuration are given.