Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 5: Pixel-Detektoren I

T 5.2: Talk

Monday, March 19, 2018, 16:15–16:30, Philo-HS5

Large area HVCMOS pixel sensor prototype for ATLAS detector upgrade — •Mridula Prathapan, Hui Zhang, Alena Weber, and Ivan Peric — KIT, Karlsruhe, Germany

HVCMOS pixel sensors have been proposed for the upgrade of ATLAS experiment. They are implemented in commercial HVCMOS technologies which makes the production cost effective when compared to hybrid sensors. The HVCMOS detectors are monolithic which means that the readout electronics and the sensor part are implemented on the same substrate. A high voltage is used to create a depletion region where the particle detection occurs. A large area prototype for ATLAS experiment named ATLASpix1 has been designed and fabricated in AMS 180nm high voltage CMOS process technology. ATLASpix1 includes three different design flavours in terms of pixel size and readout logic. The chips have been fabricated using wafers of different resistivity. The sensor contains a pixel matrix and a full readout chain that supports triggering with programmable latency and fast data transmission. A faster readout scheme called Parallel Pixel to Buffer readout (PPtB) has been introduced. Currently we are working on the reticle size (2cm x 2cm) sensor that can be used to construct detector modules for ATLAS experiment. A few design improvements on ATLASpix1 such as electronic circuits for amplitude measurement, time walk correction, hit sorting and readout data formatting have been developed and submitted for fabrication on a test chip. The status of current developments on HVCMOS sensor design in AMS 180nm will be presented with emphasis on design details.