Aligning the CMS Muon Chambers with the Muon Alignment System during an Extended Cosmic Ray Run

Details Aligning the CMS Muon Chambers with the Muon Alignment System during an Extended Cosmic Ray Run Aligning the CMS Muon Chambers with the Muon Alignment System during an Extended Cosmic Ray Run

2009-11-25

arxiv.org/abs/0911.4770v2

JINST 5:T03019,2010

Physics

Instrumentation and Detectors

Scientific paper

10.1088/1748-0221/5/03/T03019

The alignment system for the muon spectrometer of the CMS detector comprises three independent subsystems of optical and analog position sensors. It aligns muon chambers with respect to each other and to the central silicon tracker. System commissioning at full magnetic field began in 2008 during an extended cosmic ray run. The system succeeded in tracking muon detector movements of up to 18 mm and rotations of several milliradians under magnetic forces. Depending on coordinate and subsystem, the system achieved chamber alignment precisions of 140-350 microns and 30-200 microradians, close to the precision requirements of the experiment. Systematic errors on absolute positions are estimated to be 340-590 microns based on comparisons with independent photogrammetry measurements.

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