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T: Fachverband Teilchenphysik

T 15: Halbleiter: Laufende Experimente 1

T 15.6: Talk

Monday, March 9, 2015, 15:15–15:30, K.12.20 (K2)

Alignment of the CMS tracking detector with cosmic-ray tracks using Millepede II — •Juan Manuel Grados Luyando, Rainer Mankel, Matthias Schröder, and Claus Kleinwort — DESY, Hamburg, Germany

The physics performance of the CMS experiment depends crucially on its tracking detector, which consists of 25000 silicon sensors, making it the world's largest detector of this kind. In order to operate at the design precision, it is necessary to align the positions and orientations of the sensors at micrometer level. This is not a trivial task, since it requires the adjustment of approximately 200000 parameters. They are determined simultaneously in a track-based alignment procedure, using the MillePede II program, which minimizes the residuals between the measured and expected hit positions of the particle trajectories. In this presentation, alignment strategies for the early LHC Run-2 phase are outlined, and results obtained with cosmic-ray tracks are discussed.