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T: Fachverband Teilchenphysik

T 89: Pixel Detectors IV

T 89.1: Vortrag

Donnerstag, 18. März 2021, 16:00–16:15, Tn

Spatial Hit Resolution of Planar Pixel Sensors for the CMS Phase 2 Upgrade — •Finn Feindt¹, Aliakbar Ebrahimi³, Erika Garutti¹, Mohammadtaghi Hajheidari¹, Caroline Niemeyer¹, Daniel Pitzl², Georg Steinbrück¹, Jörn Schwandt¹, and Irene Zoi¹ — ¹Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Deutschland — ²Deutsches Elektronen-Synchrotron, Notkestraße 85, 22607 Hamburg, Deutschland — ³Paul Scherrer Institut, Forschungsstrasse 111, 5232 Villigen PSI, Schweiz

For the High Luminosity upgrade of the Large Hadron Collider (HL-LHC), the CMS Pixel Detector will be upgraded to withstand 1 MeV neutron equivalent fluences φ_eq of up to 2.3 × 10¹⁶ cm⁻² at a distance of 2.8 cm from the beam, corresponding to an integrated luminosity of 3000 fb⁻¹. It has to enable tracking and vertex finding in an environment of high track multiplicity with up to 200 proton-proton collisions per bunch crossing. Planar n⁺-p pixel sensors prototypes with pixel sizes of 50×50 µm² or 25×100 µm² and an active thickness of 150 µm were investigated and their spatial hit resolution was measured in the DESY II test beam. The investigated sensors were irradiated with protons or neutrons, to fluences up to φ_eq = 7 × 10¹⁵ cm⁻². The spatial hit resolution is studied as a function of the track angle and charge pixel threshold. It is compared for different fluences φ_eq and sensors with different layouts of the pixel implants. The results of this study serve as input to the final decision on the layout of planar pixel sensors for the HL-LHC upgrade of CMS.