Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 56: Pixel-Detektoren II
T 56.7: Vortrag
Mittwoch, 21. März 2018, 18:00–18:15, Z6 - HS 0.002
Efficiency and Charge Sharing of Planar Pixel Sensors for the CMS Phase 2 Upgrade — •Finn Feindt1, Aliakbar Ebrahimi1, Erika Garutti1, Caroline Niemeyer1, Daniel Pitzl2, Georg Steinbrück1, Jörn 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
The high luminosity upgrade of the LHC will lead to an increased multiplicity of proton-proton interactions, with up to 200 events per beam bunch crossing, in the CMS experiment. Furthermore, the 1 MeV neutron equivalent fluence will reach 2.3 × 1016 neq/cm2 after an integrated luminosity of 3000 fb−1 in the innermost part of the CMS pixel detector.
To build a pixel detector with good performance for these conditions, many variants of new n+p, planar pixel sensors with pixel sizes of 50 × 50 µm2 and 100 × 25 µm2 have been designed and manufactured with an active thickness of 150 µm. Apart from the pixel size, the design variants differ with respect to the implantation and metalization geometry as well as the pixel isolation and biasing scheme.
To select the most promising design for the future CMS pixel detector, a campaign of measurements on non-irradiated sensors and sensors irradiated to an 1 MeV neutron equivalent fluence of 2 × 1015 neq/cm2 is ongoing at the DESY test beam facility.
In this talk, studies of the efficiency, charge collection and charge sharing of the new pixel sensors will be presented.