Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 14: Pixel detectors I
T 14.9: Talk
Monday, March 15, 2021, 18:00–18:15, Tn
Radiation tolerant small-pixel passive CMOS sensors with RD53A readout — •Yannick Dieter, Michael Daas, Tomasz Hemperek, Fabian Hügging, Jens Janssen, Hans Krüger, David-Leon Pohl, Tianyang Wang, Norbert Wermes, Pascal Wolf, and Jochen Dingfelder — Physikalisches Institut der Universität Bonn
With the HL-LHC upgrade of the ATLAS detector, the surface of the ATLAS pixel detector will increase from 2 m2 to approximately 13 m2. Therefore, commercial CMOS processing lines offering high production throughput at comparatively low costs represent an attractive option for such large-area detectors. Further benefits originate from multiple metal layers, metal-insulator-metal capacitors, and polysilicon layers which offer enhanced sensor designs through additional routing options.
Thinned, small-pixel passive CMOS sensors in 150 nm technology offered by LFoundry were manufactured and assembled to hybrid pixel modules using the RD53A readout chip.
The sensors were characterized, before and after irradiation to fluences of 5× 1015neq/cm2 and 1× 1016neq/cm2, in the laboratory and also using a minimum ionising electron beam. Their performance in terms of noise and hit-detection efficiency equals that of conventional planar pixel sensors. Special emphasis will be put on the results after a fluence of 1× 1016neq/cm2 yielding a hit-detection efficiency of approximately 99 %.