Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 12: Pixel Detectors

T 12.8: Talk

Monday, March 21, 2022, 18:00–18:15, T-H25

Measurement of position resolution of small pixel sensors — •Amala Augusthy¹, Daniel Pitzl², Erika Garutti¹, and Jörn Schwandt¹ — ¹Institute für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Deutschland — ²Deutsches Elektronen-Synchrotron, Notkestraße 85, 22607 Hamburg, Deutschland

In order to cope with the high radiation environment in the phase 3 upgrade of CMS and ATLAS, pixel detectors with spatial resolution below 1 µm will become necessary. The resolution of pixel sensors can be improved by reducing their pitch. However, the pitch of pixel sensors is limited by the read-out electronics.

To study the intrinsic resolution capabilities, non-irradiated pixels sensors with sizes of 17 × 150 µm², 25 × 100 µm² and 50 × 50 µm² were tested with 5.2 GeV electron beam at the DESY test beam facility. The 25 × 100 µm² and 50 × 50 µm² sensors have already been characterized and are being considered for the phase 2 upgrade of the CMS experiment. The aim of this study is to reduce the pitch even further to 17 µm and investigate its performance.

These sensors have a thickness of 285 µm and are bump bonded to a low noise read-out chip ROC4SENS. The spatial resolution as a function of angle of incidence of the particle is extracted from these measurements. In this talk, the results of these measurements will be presented.