Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 95: Pixeldetektoren 5

T 95.4: Talk

Wednesday, March 29, 2017, 17:35–17:50, S 2

Implementation of radiation damage into CMS Phase II Tracker Digitizer — •Caroline Niemeyer, Erika Garutti, and Adrian Perieanu — Institute of Experimental Physics, University of Hamburg

The present simulation of the CMS pixel detector has been developed using test beam data from non-irradiated sensors. It assumes 100 percent charge collection and takes into account charge diffusion and the Lorentz angle. Radiation damage is simulated by just scaling the signal height by a fluence dependent charge-collection efficiency. From the analysis of the Pixel Phase I test beam data it is expected however that irradiation causes charge sharing between neighboring pixels, leading to a larger cluster size and possibly affecting the hit resolution, which needs to be considered to achieve a realistic description of the signal and noise in the CMS pixel detector during the High Luminosity LHC period. This knowledge has to be implemented into the Digitizer package of the CMS software in order to parametrize the response of the Phase II Pixel upgrade to a higher granular level. The status of this new radiation damage implementation in the CMS Digitizer is presented.