Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 67: Detektorsysteme III

T 67.10: Talk

Wednesday, March 27, 2019, 18:15–18:30, S03

Time-dependence in CMS tracker alignment — •Henriette Petersen — DESY, Hamburg, Germany

The Compact Muon Solenoid (CMS) is a general-purpose detector located at the Large Hadron Collider (LHC) at CERN. The high granularity silicon tracker of CMS with 1856 pixel and 15148 strip modules provide accurate track reconstruction. To achieve high precision, corrections for the position, rotation and curvature of these modules must be found; such a procedure is known as tracker alignment. Magnet cycles, temperature variations and ageing of modules cause significant time variations that affect the track reconstruction and therefore necessitate continuous alignment throughout the operation of the LHC machine. In 2017 and 2018 the LHC generated the highest instantaneous luminosity to date leading to fast changes in the pixel detector due to the proximity to the interaction region. This talk will elucidate the strategy to include a time dependence of the alignment.