Test of Scintillating Bars Coupled to Silicon Photomultipliers for A Charged Particle Tracking Device > 자유게시판

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The outcomes obtained in laboratory exams, ItagPro using scintillator bars read by silicon photomultipliers are reported. The present approach is step one for designing a precision monitoring system to be placed inside a free magnetized volume for the cost identification of low power crossing particles. The devised system is demonstrated in a position to supply a spatial decision higher than 2 mm. Scintillators, best item finder gadget Photon Solid State detector, iTagPro geofencing particle monitoring devices. 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 whole design ought to be optimised for the willpower of the momentum and charge of muons in the 0.5 - 5 GeV/c range (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. In 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 able to supply the mandatory 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 wonderful candidates in replacing standard photomultipliers in many experimental circumstances. Tests have been carried out with laser beam pulses and radioactive source with a purpose to characterize the scintillator bar response and SiPM behaviour. Here we briefly present the observed behaviour of the SiPM used in our tests relating to the principle sources of noise and the effect of temperature on its response and best item finder gadget linearity. Several fashions and packaging have been thought-about. The primary source of noise which limits the SiPM’s single photon decision is the "dark current" charge. It's originated by charge carriers thermally created in the delicate quantity and present in the conduction band and due to this fact it will depend on the temperature. The dependence of the darkish present single pixel fee as a perform of the temperature has been investigated utilizing Peltier cells in order to change and keep the temperature controlled.

Dark present charge depends also on the Vwk as proven in Fig. 3. With the intention to have low rates of darkish present the worth of Vbias has been fixed at 1.5 V giving a working voltage Vwk of 29 V. It is clear that, if needed, best item finder gadget it may be convenient to make use of a bias voltage regulator which automatically compensates for temperature variations. Not always the pixels of the SiPM work independently from each other. Photoelectrons (p.e.) can migrate from the hit pixel to a different circuitously 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 chance could 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 degree of cross-speak (15-16%) is suitable with the one reported in the datasheet. SiPM response once its primary parameters and cells configuration are given.

In the Fig. Four it is shown the pulse height distribution of the dark present for the SiPM beneath check. 0.2) mm diameter hole used to lodge a fiber to gather the sunshine. The lateral floor of the scintillator strips is painted with white EJ-510 TiO2 Eljen paint. The scintillation gentle is collected with 1.2 mm BCF-91A WaveLength Shifter (WLS) fiber produced by the Saint-Gobain Ltd. The WLS is glued into the hole running along the bar and its ends are polished. The learn-out is carried out by the SiPM solely at one finish and the opposite aspect is mirrored with reflecting tape to maximize the sunshine collection. The front-finish board prototype dedicated to the amplification and SiPM readout has been developed by the Bologna INFN electronic group. The present from the SiPM is discharged on the low input resistance of the transimpedance amplifier; this offers small time constants, that is, quick signal rise time (using the OPA 656N with a 500 MHz bandwidth we get hold of signals with 20-30 ns of rise time).