Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 45: Detektorsysteme II

T 45.3: Talk

Tuesday, March 26, 2019, 16:30–16:45, ST 4

Efficiency and Charge Sharing of Planar Pixel Sensors for the CMS Phase 2 Upgrade — •Finn Feindt¹, Aliakbar Ebrahimi¹, Erika Garutti¹, Paolo Gunnellini¹, Caroline Niemeyer¹, Daniel Pitzl², Georg Steinbrueck¹, Joern Schwandt¹, and Irene Zoi¹ — ¹Institute for Experimental Physics, Hamburg University, Luruper Chaussee 149, D-22761 Hamburg, Germany — ²Deutsches Elektronen-Synchrotron, Notkestraße 85, D-22607 Hamburg, Germany

For the high luminosity upgrade of the LHC a new pixel detector will be built to meet new requirements due to higher track multiplicities and an expected 1 MeV neutron equivalent fluence of up to 2.3 × 10¹⁶ neq/cm² after an integrated luminosity of 3000 fb⁻¹.
To fulfill these requirements new n⁺p pixel sensors with pixel sizes of 50 × 50 µm² and 100 × 25 µm², an active thickness of 150 µm and various implantation and metalization geometries, pixel isolation and biasing schemes have been designed, manufactured and tested in a campaign of beam test measurements.
To determine the hit efficiencies of the new pixel sensors, the impact point of the beam electrons was determined using a track reconstruction in the beam telescope with a position resolution at the order of 5 µm. A CMS Phase 1 module was used as a time reference. The sensors irradiated up to fluences of 8 × 10¹⁵ neutrons/cm² show a hit efficiency above 99 % at bias voltages greater then 300 V.
In addition to results of the efficiency studies, results on charge sharing studies are shown in this talk.