Abstract
Current high energy particle physics experiments at the LHC use hybrid silicon detectors, in both pixel and strip configurations, for their inner trackers. These detectors have proven to be very reliable and performant. Nevertheless, there is great interest in depleted CMOS silicon detectors, which could achieve a similar performance at lower cost of production. We present recent developments of this technology in the framework of the ATLAS CMOS demonstrator project. In particular, studies of two active sensors from LFoundry, CCPD_LF and LFCPIX, are shown.
Highlights
Introduction to CMOS detectors in ATLASMost current HEP experiments operating at the LHC have a pixel system based on silicon hybrid technologies at the center of their trackers
We present recent developments of this technology in the framework of the ATLAS CMOS demonstrator project
MAPS have been used in particle physics experiments [3, 4] providing excellent performance due to their fine granularity and low material
Summary
Most current HEP experiments operating at the LHC have a pixel system based on silicon hybrid technologies at the center of their trackers. The connection is guaranteed by arrays of conductive bumps, one per pixel, generally made with solder material deposition of SnPb or indium These detectors have achieved excellent performances providing a good signal response within 25 ns. MAPS have been used in particle physics experiments [3, 4] providing excellent performance due to their fine granularity (the pixel size can be about 20 × 20 μm2) and low material. In order to obtain high voltage operation, the read-out circuitry is nested inside a deep n-well. This way, the depletion region is formed between the substrate and the deep N-well itself [6]. A sketch of these add-ons can be seen in figure 1(b)
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