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T: Fachverband Teilchenphysik

T 13: Pixel detectors I

T 13.6: Vortrag

Montag, 30. März 2020, 17:45–18:00, H-HS XIV

Capacitance measurements on silicon pixel sensors for ATLAS ITk — •Evelyn Kimmerle, Hans Krüger, and Norbert Wermes — Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Deutschland

The pixel capacitance is a sensitive parameter when it comes to pixel sensors and signal processing. It has influence on noise performance, time resolution and power consumption so its precise knowledge is important.

For this purpose, a dedicated integrated circuit was developed. The so-called PixCap65 chip provides a powerful tool for pixel sensor capacitance measurement with unprecedented sub-femtofarad precision.

The PixCap65 chip is compatible with the next generation of pixel sensors with small 50µm x 50µm pixels that are deployed in the future hybrid pixel detectors of the ATLAS and CMS experiments.

In this presentation, the functional principle of the PixCap65 chip and measurement results of various sensor pixel geometries are discussed.