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The results obtained in laboratory tests, using scintillator bars read by silicon photomultipliers are reported. The current method is step one for designing a precision monitoring system to be placed inside a free magnetized volume for the charge identification of low vitality crossing particles. The devised system is demonstrated ready to supply a spatial decision higher than 2 mm. Scintillators, Photon Solid State detector, iTagPro particle tracking gadgets. Among the planned actions was the development of a light spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The entire design needs to be optimised for the willpower of the momentum and iTagPro 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 able to offer the necessary spatial resolution in reconstructing the place of the crossing particle by profiting of the cost-sharing between adjoining bars readout in analog mode. SiPMs are excellent candidates in replacing normal photomultipliers in lots of experimental conditions. Tests have been performed with laser beam pulses and radioactive source as a way to characterize the scintillator bar response and SiPM behaviour. Here we briefly current the observed behaviour of the SiPM utilized in our checks concerning the principle sources of noise and the effect of temperature on its response and linearity. Several fashions and packaging have been thought of. The primary supply of noise which limits the SiPM’s single photon resolution is the "dark current" rate. It is originated by cost carriers thermally created in the delicate quantity and current within the conduction band and therefore it depends upon the temperature. The dependence of the dark present single pixel fee as a function of the temperature has been investigated utilizing Peltier cells in order to vary and keep the temperature managed.

Dark present charge relies upon 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 mounted at 1.5 V giving a working voltage Vwk of 29 V. It is obvious that, if vital, it may be convenient to use a bias voltage regulator which robotically compensates for temperature variations. Not all the time the pixels of the SiPM work independently from one another. Photoelectrons (p.e.) can migrate from the hit pixel to another circuitously fired by a photon. Optical cross-talk between pixels leads to a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross speak likelihood may be obtained by the ratio double-to-single pulse price as a function of the temperature. The likelihood depends weakly on the temperature and the measured degree of cross-speak (15-16%) is suitable with the one reported in the datasheet. SiPM response as soon as its primary parameters and cells configuration are given.