Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 45: Detektorsysteme II

T 45.4: Talk

Tuesday, March 26, 2019, 16:45–17:00, ST 4

Spatial resolution measurements with planar pixel sensors for the CMS Phase-2 Upgrade — •Irene Zoi¹, Aliakbar Ebrahimi¹, Finn Feindt¹, Erika Garutti¹, Paolo Gunnellini¹, Andreas Hinzmann¹, Caroline Niemeyer¹, Daniel Pitzl², Georg Steinbrück¹, and Jörn Schwandt¹ — ¹Institute for Experimental Physics, Hamburg University, Luruper Chaussee 149, D-22761 Hamburg, Germany — ²Deutsches Elektronen-Synchrotron, Notkestraße 85, D-22607 Hamburg, Germany

New pixel sensors are being developed for the CMS Phase–2 upgrade, that will operate at HL-LHC, where 200 pile-up events per bunch crossing may be reached. To pursue a high tracking efficiency in this condition, the granularity of the pixel detector will be six time higher than the current one and the sensors are required to be radiation hard.Various n⁺p silicon pixel sensor designs are therefore being tested, with pixel sizes of 50×50 µm² and 100×25 µm² and an active thickness of 150 µm. The hit resolution improves from a reduced pixel size but it may deteriorate with radiation damage. This talk will present spatial resolution studies of non–irradiated and proton irradiated sensors bump bonded to ROC4Sens read-out chips, performed in the DESY test beam facility. Three parallel planes of sensors have been used, therefore not relying on an external reference tracking detector. Measurements have been performed for various sensor designs at different energies of the electron beam as well as incidence angles to investigate all the relevant contributions to the resolution. A resolution of a few µm, also after irradiation, has been achieved.