Conference Presentation

PUBDB-2015-01698

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Simultaneous Alignment of the CMS Silicon Tracker using Millepede II

Stefaniuk, N.DESY*

2015

Abstract: The CMS tracker is the world's largest silicon detector, consisting of more than 25 000 sensors. A precise knowledge of their positions and orientations is crucial for the physics performance of the whole experiment. Track-based alignment procedure uses minimization of the residuals between the measured and expected hit position in the detector. An accuracy of 10 μm and 10 μrad for the module position and orientation, respectively, is achieved. Both tracks from pp-collision and cosmic-ray data are taken into account. In this way, more than 200 000 alignment parameters, describing the position, rotation and curvature of the sensors are determined simultaneously using the Millepede II program. In the presentation, results of the CMS-tracker alignment with the data collected in 2012 are presented. The sensitivity of the procedure to a certain misalignment scenario is investigated, and foreseen improvements for the upcoming LHC Run-2 are discussed. Speakers

Note: OA

---

Contributing Institute(s):

1. LHC/CMS Experiment (CMS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. LHC: CMS

Appears in the scientific report 2015

---

Database coverage:

---