Mechanical stability of the CMS strip tracker measured with a laser alignment system
File(s)Sirunyan_2017_J._Inst._12_P04023.pdf (8.8 MB)
Published version
Author(s)
Type
Journal Article
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 30 µm. In addition, temperature variations were found to cause displacements of tracker
structures of about 2 µm/◦C, which largely revert to their initial positions when the temperature is
restored to its original value.
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 30 µm. In addition, temperature variations were found to cause displacements of tracker
structures of about 2 µm/◦C, which largely revert to their initial positions when the temperature is
restored to its original value.
Date Issued
2017-04-21
Date Acceptance
2017-04-08
Citation
Journal of Instrumentation, 2017, 12
ISSN
1748-0221
Publisher
IOP Publishing
Journal / Book Title
Journal of Instrumentation
Volume
12
Copyright Statement
© CERN 2017 for the benefit of the CMS collaboration, published under the terms of the
Creative Commons Attribution 3.0 License by IOP Publishing Ltd and Sissa Medialab
srl. Any further distribution of this work must maintain attribution to the author(s) and the published
article’s title, journal citation and DOI.
Creative Commons Attribution 3.0 License by IOP Publishing Ltd and Sissa Medialab
srl. Any further distribution of this work must maintain attribution to the author(s) and the published
article’s title, journal citation and DOI.
License URL
Subjects
Science & Technology
Technology
Instruments & Instrumentation
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)
DETECTOR
Publication Status
Published
Article Number
P04023