Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 845, Issue -, Pages 583-587Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2016.05.016
Keywords
CMOS Monolithic Pixel Sensor; ALICE; Inner tracking system upgrade; ALPIDE
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The ALPIDE chip is a CMOS Monolithic Active Pixel Sensor being developed for the Upgrade of the ITS of the ALICE experiment at the CERN Large Hadron Collider. The ALPIDE chip is implemented With a 180 nm CMOS Imaging Process and fabricated on substrates with a high-resistivity epitaxial layer. It measures 15 mm x 30 mm and contains a matrix of 512 x 1024 pixels with in-pixel amplification, Shaping, discrimination and multi-event buffering. The readout of the sensitive Matrix is hit driven. There is no signaling activity over the matrix if there are no hits to read out and power consumption is proportional to the occupancy. The sensor meets the experimental requirements of detection efficiency above 99%, fake-hit probability below 10(-5) and a spatial resolution of 5 pm. The capability to read out Pb-Pb interactions at 100 kHz is provided. The power density of the ALPIDE chip is projected to be less than 35 mW/cm(2) for the application in the Inner Barrel Layers and below 20 mW/cm2 for the Outer Barrel Layers, where the occupancy is lower. This contribution describes the architecture and the main features of the final ALPIDE chip, planned for submission at the beginning of 2016. Early results from the experimental qualification of full scale prototype predecessors are also reported. (C) 2016 The Author. Published by Elsevier B.V.
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