Speaker
Luis Alejandro Perez Perez
(IPHC - CNRS)
Description
The use of CMOS Pixel Sensors (CPS) for high resolution, low material, vertex detectors has been validated with the 2014 and 2015 physics runs of the
STAR-PXL detector at RHIC/BNL. This opens the door to the use of CPS for inner tracking devices, with 10-100 times larger sensitive area, which require
therefore a sensor design privileging power saving, response uniformity and robustness. Exploiting the relaxed constrained on the spatial resolution of
trackers and the added value of a $180~{\rm nm}$ CMOS process, a specific small CPS prototype was fabricated in 2014, with 5 times larger pixels than
those used in STAR. Its detection performances were assessed with particle beams, investigating in particular the impact of the reduced sensing node
density on the detection efficiency. The studies were complemented by those of a full scale prototype ($160{\rm k}$ pixels) featuring small pixels for
a vertex detector, in which large pixels could be implemented as a next step. The most prominent outcomes of this R&D, which validates for the first
time the concept addressed, will be presented.
Primary author
Luis Alejandro Perez Perez
(IPHC - CNRS)
