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The results obtained in laboratory assessments, using scintillator bars read by silicon photomultipliers are reported. The present approach is the first step for designing a precision tracking system to be placed inside a free magnetized volume for the charge identification of low power crossing particles. The devised system is demonstrated able to offer a spatial resolution higher than 2 mm. Scintillators, Photon Solid State detector, particle monitoring devices. Among the many deliberate actions was the development of a mild spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The whole 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 less 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 supply the necessary spatial decision in reconstructing the position of the crossing particle by profiting of the charge-sharing between adjacent bars readout in analog mode. SiPMs are wonderful candidates in replacing customary photomultipliers in lots of experimental situations. Tests have been performed with laser beam pulses and radioactive source in an effort to characterize the scintillator bar response and SiPM behaviour. Here we briefly present the noticed behaviour of the SiPM used in our checks concerning the main sources of noise and the effect of temperature on its response and linearity. Several fashions and packaging have been thought-about. The main supply of noise which limits the SiPM’s single photon resolution is the "dark current" fee. It's originated by cost carriers thermally created in the sensitive volume and current in the conduction band and due to this fact it is dependent upon the temperature. The dependence of the darkish current single pixel rate as a perform of the temperature has been investigated using Peltier cells so as to change and keep the temperature controlled.

Dark current price depends additionally on the Vwk as shown in Fig. 3. With a purpose 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 crucial, it may be handy to make use of a bias voltage regulator which routinely compensates for temperature variations. Not at all times 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-talk between pixels results in a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross discuss probability might be obtained by the ratio double-to-single pulse rate as a function of the temperature. The likelihood relies upon weakly on the temperature and the measured stage of cross-speak (15-16%) is compatible with the one reported in the datasheet. SiPM response once its basic parameters and cells configuration are given.