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

Volker Adler, Stephanie Beauceron, Stijn Blyweert, Jorgen D'Hondt, Stijn De Weirdt, Olivier Devroede, Jan Heyninck, Alexis Kalogeropoulos, Joris Maes, Michael Maes, Matthias Mozer, Stefaan Tavernier, Walter Van Doninck, Petra Van Mulders, Ilaria Villella

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

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.
Original languageEnglish
Article numberT03019
Number of pages35
JournalJINST
Volume5
Publication statusPublished - 2010

Keywords

  • OSG : CMS

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