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The results obtained in laboratory tests, using scintillator bars learn by silicon photomultipliers are reported. The present approach is step one for designing a precision tracking system to be positioned inside a free magnetized volume for the charge identification of low energy crossing particles. The devised system is demonstrated able to offer a spatial decision higher than 2 mm. Scintillators, Photon Solid State detector, particle tracking gadgets. Among the planned actions was the construction of a light spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The whole design needs to be optimised for the determination of the momentum and charge 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 volume. 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 in a position to offer the required spatial decision in reconstructing the place of the crossing particle by profiting of the charge-sharing between adjacent bars readout in analog mode. SiPMs are glorious candidates in replacing commonplace photomultipliers in lots of experimental situations. Tests have been carried out with laser beam pulses and radioactive supply in an effort 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 primary sources of noise and the effect of temperature on its response and linearity. Several fashions and packaging have been considered. The principle source of noise which limits the SiPM’s single photon resolution is the "dark current" fee. It's originated by charge carriers thermally created within the sensitive volume and current in the conduction band and subsequently it is determined by the temperature. The dependence of the darkish current single pixel rate as a operate of the temperature has been investigated using Peltier cells in order to change and keep the temperature managed.
Dark present price depends additionally on the Vwk as proven in Fig. 3. So as to have low rates of dark present the value of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, if mandatory, 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 one another. Photoelectrons (p.e.) can migrate from the hit pixel to another indirectly 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 talk probability can be obtained by the ratio double-to-single pulse charge as a perform of the temperature. The likelihood relies upon weakly on the temperature and the measured level of cross-talk (15-16%) is suitable with the one reported in the datasheet. SiPM response as soon as its primary parameters and cells configuration are given.