Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Instrumentation I

HK 4.3: Vortrag

Montag, 28. März 2022, 14:45–15:00, HK-H3

In-beam characterisation of a 65 nm CMOS technology Digital Pixel Test Structure towards a future ALICE Inner Tracking System 3 — •Pascal Becht for the ALICE collaboration — Physikalisches Institut, Heidelberg University, Germany

Recently, a new Inner Tracking System (ITS2) based on Monolithic Active Pixel Sensors (MAPS) has been installed in the ALICE detector. For a future upgrade of this tracker, it is intended to replace the three innermost layers of the current ITS2 with a novel vertex detector, the ITS3. The proposed design features wafer-scale, ultra-thin, truly cylindrical MAPS. In oder to benefit from the smaller feature size and the larger available wafers, the new sensors are supposed to be produced in 65 nm CMOS technology.

An extensive R&D programme is established in order to qualify this technology for the application in MAPS. It is supported by the BMBF funded High-D consortium for future particle detector development efforts. As one of the first steps towards the new sensor design, different variants of Digital Pixel Test Structures (DPTS) have been produced and tested in an electron beam at DESY. First results from this testbeam campaign are presented with emphasis on the detection efficiency. It is shown that the measured sensor efficiency exceeds 90%. This outcome is very encouraging for the application of the 65 nm CMOS technology in future MAPS-based detectors.