The CMS Phase-1 pixel detector upgrade

Tracker Group of the CMS collaboration

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


The CMS detector at the CERN LHC features a silicon pixel detector as its innermost subdetector. The original CMS pixel detector has been replaced with an upgraded pixel system (CMS Phase-1 pixel detector) in the extended year-end technical stop of the LHC in 2016/2017. The upgraded CMS pixel detector is designed to cope with the higher instantaneous luminosities that have been achieved by the LHC after the upgrades to the accelerator during the first long shutdown in 2013-2014. Compared to the original pixel detector, the upgraded detector has a better tracking performance and lower mass with four barrel layers and three endcap disks on each side to provide hit coverage up to an absolute value of pseudorapidity of 2.5. This paper describes the design and construction of the CMS Phase-1 pixel detector as well as its performance from commissioning to early operation in collision data-taking.

Original languageEnglish (US)
Article numberP02027
JournalJournal of Instrumentation
Issue number2
StatePublished - Feb 1 2021


  • Detector alignment and calibration methods (lasers, sources, particle-beams)
  • Detector design and construction technologies and materials
  • Instrumentation for particle accelerators and storage rings - high energy (linear accelerators, synchrotrons)
  • Particle tracking detectors

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics


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