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T: Fachverband Teilchenphysik

T 15: Halbleiter: Laufende Experimente 1

T 15.5: Talk

Monday, March 9, 2015, 15:00–15:15, K.12.20 (K2)

Preparation of the CMS tracker alignment for the LHC Run-2 — •Aleksandra Lelek, Rainer Mankel, Matthias Schröder, and Claus Kleinwort — DESY, Notkestraße 85, 22607 Hamburg

The CMS tracker is the world's largest silicon detector and consists of more than 25000 sensors. A precise knowledge of their position is crucial for an accurate reconstruction of higher-level objects such as particle trajectories (tracks) and jets. Using a track-based alignment procedure, which minimizes the residuals between the measured and predicted hit positions in the detector, the position and orientation of the sensors are determined to the level of 10 μm and 10 μrad, respectively.

In the presentation, the impact of the alignment precision on the object reconstruction is investigated and alignment strategies for the upcoming LHC Run-2 are discussed.