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NEXT-100 experiment aims at searching the neutrinoless double-beta decay ofthe Xe-136 isotope using a TPC filled with a 100 kg of high-pressure gaseousxenon, with 90% isotopic enrichment. The experiment will take place at theLaboratorio Subterr\'aneo de Canfranc (LSC), Spain. NEXT-100 useselectroluminescence (EL) technology for energy measurement with a resolutionbetter than 1% FWHM. The gaseous xenon in the TPC additionally allows thetracks of the two beta particles to be recorded, which are expected to have alength of up to 30 cm at 10 bar pressure. The ability to record the topologicalsignature of the neutrinoless double-beta events provides a powerful backgroundrejection factor for the double-beta experiment.  In this paper, we present a novel 3D imaging concept using SiPMs coated withtetraphenyl butadiene (TPB) for the EL read out and its first implementation inNEXT-DEMO, a large-scale prototype of the NEXT-100 experiment. The design andthe first characterization measurements of the NEXT-DEMO SiPM tracking systemare presented. The SiPM response uniformity over the tracking plane drawn fromits gain map is shown to be better than 4%. An automated active control systemfor the stabilization of the SiPMs gain was developed, based on the voltagesupply compensation of the gain drifts. The gain is shown to be stabilizedwithin 0.2% relative variation around its nominal value, provided by Hamamatsu,in a temperature range of 10 degree C. The noise level from the electronics andthe SiPM dark noise is shown to lay typically below the level of 10photoelectrons (pe) in the ADC. Hence, a detection threshold at 10 pe is setfor the acquisition of the tracking signals. The ADC full dynamic range (4096channels) is shown to be adequate for signal levels of up to 200pe/microsecond, which enables recording most of the tracking signals.

Design and characterization of the SiPM tracking system of NEXT-DEMO, a demonstrator prototype of the NEXT-100 experiment