Test Of Scintillating Bars Coupled To Silicon Photomultipliers For A Charged Particle Tracking Device: Difference between revisions
(Created page with "<br>The outcomes obtained in laboratory tests, utilizing scintillator bars read by silicon photomultipliers are reported. The present strategy is step one for designing a precision tracking system to be positioned inside a free magnetized volume for the cost identification of low power crossing particles. The devised system is demonstrated able to offer a spatial resolution better than 2 mm. Scintillators, Photon Solid State detector, [https://bbclinic-kr.com:443/nose/n...") |
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Latest revision as of 13:27, 23 October 2025
The outcomes obtained in laboratory tests, utilizing scintillator bars read by silicon photomultipliers are reported. The present strategy is step one for designing a precision tracking system to be positioned inside a free magnetized volume for the cost identification of low power crossing particles. The devised system is demonstrated able to offer a spatial resolution better than 2 mm. Scintillators, Photon Solid State detector, ItagPro particle monitoring units. Among the many deliberate activities was the construction of a mild spectrometer seated in a 20-30 m3 magnetized air quantity, the Air Core Magnet (ACM). The entire design must be optimised for the determination of the momentum and ItagPro charge of muons within 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. On this paper we report the outcomes obtained with a small array of triangular scintillator ItagPro bars coupled to silicon photomultiplier (SiPM) with wavelength shifter (WLS) fibers.
This bar profile is right here demonstrated ready to offer the mandatory spatial resolution in reconstructing the position of the crossing particle by profiting of the charge-sharing between adjoining bars readout in analog mode. SiPMs are excellent candidates in changing customary photomultipliers in many experimental circumstances. Tests have been performed with laser beam pulses and radioactive supply so as to characterize the scintillator bar response and iTagPro features SiPM behaviour. Here we briefly present the noticed behaviour of the SiPM used in our tests regarding the main sources of noise and the impact of temperature on its response and linearity. Several models and packaging have been considered. The primary supply of noise which limits the SiPM’s single photon decision is the "dark current" price. It is originated by charge carriers thermally created in the sensitive quantity and ItagPro present within the conduction band and therefore it is determined by the temperature. The dependence of the darkish present single pixel charge as a perform of the temperature has been investigated using Peltier cells so as to alter and ItagPro keep the temperature controlled.
Dark present rate relies upon also on the Vwk as shown in Fig. 3. With a view to have low rates of dark current the worth of Vbias has been mounted at 1.5 V giving a working voltage Vwk of 29 V. It is evident that, itagpro device if vital, iTagPro portable it can be convenient to make use of a bias voltage regulator everyday tracker tool which routinely compensates for ItagPro temperature variations. Not at all times the pixels of the SiPM work independently from one another. Photoelectrons (p.e.) can migrate from the hit pixel to a different circuitously fired by a photon. Optical cross-speak between pixels results in a non-Poissonian behaviour of the distribution of fired pixels. An estimate of the optical cross discuss chance will be obtained by the ratio double-to-single pulse fee as a perform of the temperature. The chance relies upon weakly on the temperature and the measured stage of cross-discuss (15-16%) is compatible with the one reported in the datasheet. SiPM response as soon as its fundamental parameters and cells configuration are given.
Within the Fig. Four it is shown the pulse height distribution of the dark present for the SiPM beneath test. 0.2) mm diameter gap used to lodge a fiber to collect the light. The lateral surface of the scintillator strips is painted with white EJ-510 TiO2 Eljen paint. The scintillation light 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 performed by the SiPM only at one finish and the alternative facet is mirrored with reflecting tape to maximize the light collection. The entrance-end board prototype devoted to the amplification and ItagPro SiPM readout has been developed by the Bologna INFN digital group. The current from the SiPM is discharged on the low input resistance of the transimpedance amplifier; this gives small time constants, that is, fast signal rise time (using the OPA 656N with a 500 MHz bandwidth we acquire signals with 20-30 ns of rise time).