Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 56: Pixel-Detektoren II

T 56.6: Talk

Wednesday, March 21, 2018, 17:45–18:00, Z6 - HS 0.002

Lorentz angle measurements in irriadiated CMS pixel detector modules — •Paul Schütze and Daniel Pitzl — Deutsches Elektronen-Synchrotron DESY, Hamburg, Deutschland

Since the replacement of the CMS experiment’s pixel detector in the extended 2016/17 shutdown, the detector modules have already been exposed to a significant dose of radiation. The modules’ built-in readout chips and silicon sensors are designed for operation at LHC design luminosity without efficiency losses and are tested to be fully functioning up to radiation doses above the expected lifetime dose. However, the ongoing irradiation of the modules during the operation leads to significant changes in several properties of the sensors and the readout chips.

For this contribution, several pixel detector modules of different irradiation fluence were measured, with the main focus on measurements of the Lorentz angle. A setup of four CMS barrel pixel detector modules was commissioned at the DESY Test Beam Facility, to enable particle tracking in the available 1.3 T magnetic field. For the use of irradiated detector modules a cooling system was provided, enabling the measurement of the Lorentz angle as a function of fluence, bias voltage and temperature.

The experimental setup is presented together with measurement results and comparisons with simulations.