Asset Tracking Tags
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The results obtained in laboratory assessments, utilizing scintillator bars learn by silicon photomultipliers are reported. The current approach is step one for designing a precision monitoring system to be placed inside a free magnetized volume for the charge identification of low energy crossing particles. The devised system is demonstrated ready to provide a spatial decision better than 2 mm. Scintillators, Photon Solid State detector, particle tracking units. Among the many deliberate activities was the development of a gentle spectrometer seated in a 20-30 m3 magnetized air volume, the Air Core Magnet (ACM). The entire design must be optimised for the dedication 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 inside 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 here demonstrated ready to provide 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 excellent candidates in changing commonplace photomultipliers in lots of experimental situations. Tests have been carried out with laser beam pulses and radioactive supply to be able to characterize the scintillator bar response and SiPM behaviour. Here we briefly present the noticed behaviour of the SiPM utilized in our checks concerning the primary sources of noise and the impact of temperature on its response and linearity. Several models and packaging have been considered. The principle source of noise which limits the SiPM’s single photon resolution is the "dark current" rate. It is originated by charge carriers thermally created in the delicate volume and current within the conduction band and therefore it will depend on the temperature. The dependence of the darkish present single pixel charge as a perform of the temperature has been investigated utilizing Peltier cells so as to vary and keep the temperature managed.
Dark present rate depends also on the Vwk as shown in Fig. 3. With a view to have low rates of darkish current the worth of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is obvious that, if needed, it may be handy to use a bias voltage regulator which automatically 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 not directly fired by a photon. Optical cross-speak between pixels leads to a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross discuss chance might be obtained by the ratio double-to-single pulse price as a perform of the temperature. The likelihood depends weakly on the temperature and the measured level of cross-discuss (15-16%) is compatible with the one reported within the datasheet. SiPM response as soon as its primary parameters and cells configuration are given.