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The outcomes obtained in laboratory checks, using scintillator bars learn by silicon photomultipliers are reported. The present method is the first step for designing a precision tracking system to be positioned inside a free magnetized volume for the charge identification of low vitality crossing particles. The devised system is demonstrated in a position to provide a spatial decision higher than 2 mm. Scintillators, Photon Solid State detector, particle tracking devices. Among the deliberate actions was the development of a mild spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The entire design should 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 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 right here demonstrated able to supply 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 excellent candidates in replacing commonplace photomultipliers in lots of experimental situations. Tests have been carried out 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 exams regarding the principle sources of noise and the impact of temperature on its response and linearity. Several fashions and packaging have been thought-about. The primary source of noise which limits the SiPM’s single photon decision is the "dark current" fee. It's originated by charge carriers thermally created in the delicate quantity and present in the conduction band and due to this fact it depends upon the temperature. The dependence of the dark current single pixel charge as a operate of the temperature has been investigated using Peltier cells in order to vary and keep the temperature controlled.
Dark present rate relies upon additionally on the Vwk as shown in Fig. 3. To be able to have low rates of darkish present the worth of Vbias has been fastened at 1.5 V giving a working voltage Vwk of 29 V. It is clear that, best bluetooth tracker if needed, it can be convenient to make use of a bias voltage regulator which robotically 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 another circuitously 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 discuss chance could be obtained by the ratio double-to-single pulse price as a perform of the temperature. The likelihood relies upon weakly on the temperature and the measured level of cross-talk (15-16%) is compatible with the one reported in the datasheet. SiPM response once its fundamental parameters and cells configuration are given.