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Mechanical stability of the CMS strip tracker measured with a laser alignment system

  • The CMS collaboration
  • A. Alikhanian Yerevan Institute of Physics
  • Austrian Academy of Sciences
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Research output: Contribution to journalArticlepeer-review

Abstract

The CMS tracker consists of 206 m2 of silicon strip sensors assembled on carbon fibre composite structures and is designed for operation in the temperature range from -25 to +25°C. The mechanical stability of tracker components during physics operation was monitored with a few μm resolution using a dedicated laser alignment system as well as particle tracks from cosmic rays and hadron-hadron collisions. During the LHC operational period of 2011-2013 at stable temperatures, the components of the tracker were observed to experience relative movements of less than 30μm. In addition, temperature variations were found to cause displacements of tracker structures of about 2μm°C, which largely revert to their initial positions when the temperature is restored to its original value.

Original languageEnglish
Article numberP04023
JournalJournal of Instrumentation
Volume12
Issue number4
DOIs
StatePublished - 21 Apr 2017
Externally publishedYes

Keywords

  • Detector alignment and calibration methods (lasers, sources, particle-beams)
  • Large detector systems for particle and astroparticle physics
  • Particle tracking detectors
  • Particle tracking detectors (Solid-state detectors)

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