Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 12: Pixel Detectors
T 12.9: Vortrag
Montag, 21. März 2022, 18:15–18:30, T-H25
Characterisation of planar pixel sensor for the CMS phase-2 upgrade — •Mohammadtaghi Hajheidari1, Massimiliano Antonello1, Finn Feindt2, Erika Garutti1, Daniel Pitzl2, Jörn Schwandt1, Georg Steinbrück1, Annika Vauth1, and Irene Zoi3 — 1Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Deutschland — 2Deutsches Elektronen-Synchrotron, Notkestraße 85, 22607 Hamburg, Deutschland — 3Fermilab, Batavia, IL, 60510, USA
For the High Luminosity phase of the Large Hadron Collider (HL-LHC), the CMS pixel detector is expected to collect up to 1-MeV neutron equivalent fluence, Φeq, of 2.3 × 1016 cm−2 for integrated luminosity of 3000 fb−1. The pixel detector will be upgraded to withstand this range of fluence.
Planar n-in-p pixel sensors with an active thickness of 150 µ m and a pixel size of 25 × 100 µ m2 have been produced by Hamamatsu Photonics (HPK) and FBK. The sensors were bumped bonded to the RD53A readout chip prototype. The sensor-chip modules were irradiated with 23 MeV protons to the equivalent fluence of up to 2.4 × 1016 cm−2.
The modules were investigated in the DESY II beam test facility after irradiation. The hit efficiency and spatial resolution as a function of the incidence angle of pixel sensors were determined from these measurements. For non-irradiated modules, a single hit resolution of 2 µ m was achieved at the optimal angle. For irradiated modules with highest fluence, the single hit efficiency still reached 98 % at bias voltages below 800 V.