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The results obtained in laboratory assessments, using scintillator bars read by silicon photomultipliers are reported. The current strategy is the first step for designing a precision tracking system to be positioned inside a free magnetized quantity for the cost identification of low power crossing particles. The devised system is demonstrated ready to offer a spatial resolution better than 2 mm. Scintillators, Photon Solid State detector, particle tracking devices. Among the many deliberate activities was the construction of a mild spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The whole 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 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 right here demonstrated able to offer the necessary spatial decision 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 changing commonplace photomultipliers in many experimental circumstances. Tests have been carried out with laser beam pulses and radioactive supply in order to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the noticed behaviour of the SiPM utilized in our exams regarding the principle sources of noise and the effect of temperature on its response and linearity. Several fashions and packaging have been thought-about. The main source of noise which limits the SiPM’s single photon decision is the "dark current" fee. It's originated by cost carriers thermally created within the delicate volume and current in the conduction band ItagPro and therefore it will depend on the temperature. The dependence of the darkish present single pixel price as a operate of the temperature has been investigated utilizing Peltier cells in order to alter and keep the temperature controlled.
Dark current price depends also on the Vwk as proven in Fig. 3. With a purpose to have low rates of dark present the value of Vbias has been fastened at 1.5 V giving a working voltage Vwk of 29 V. It is clear that, if mandatory, ItagPro it may be handy to make use of a bias voltage regulator which mechanically compensates for temperature variations. Not all the time the pixels of the SiPM work independently from each other. Photoelectrons (p.e.) can migrate from the hit pixel to another indirectly 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 likelihood will be obtained by the ratio double-to-single pulse charge as a operate of the temperature. The probability relies upon weakly on the temperature and the measured degree of cross-talk (15-16%) is appropriate with the one reported within the datasheet. SiPM response as soon as its fundamental parameters and cells configuration are given.