Alignment of the CMS tracker with LHC and cosmic ray data

The CMS Collaboration

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


The central component of the CMS detector is the largest silicon tracker ever built. The precise alignment of this complex device is a formidable challenge, and only achievable with a significant extension of the technologies routinely used for tracking detectors in the past. This article describes the full-scale alignment procedure as it is used during LHC operations. Among the specific features of the method are the simultaneous determination of up to 200 000 alignment parameters with tracks, the measurement of individual sensor curvature parameters, the control of systematic misalignment effects, and the implementation of the whole procedure in a multi-processor environment for high execution speed. Overall, the achieved statistical accuracy on the module alignment is found to be significantly better than 10μm.

Original languageEnglish
Article numberP06009
JournalJournal of Instrumentation
Issue number6
Publication statusPublished - 2014 Jun 1

Bibliographical note

Funding Information:
We thank Drs. J Williams and T Palmer for PTRF fragment DNA constructs. This work was supported by the grants NIH DK-30425 and DK-092942 to PFP. The authors declare no financial conflict of interest.

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Mathematical Physics


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