Fast alignment of a complex tracking detector using advanced track models

Details Fast alignment of a complex tracking detector using advanced track models Fast alignment of a complex tracking detector using advanced track models

2011-03-21

arxiv.org/abs/1103.3909v1

Physics

Instrumentation and Detectors

Poster presented at CCP2010, Trondheim. Submitted to proceedings CCP2010, Computer Physics Communications

Scientific paper

The inner silicon detector of the Compact Muon Solenoid experiment (CMS) at CERN's LHC consists of 16588 modules. Charged-particle tracks in the detector are used to improve the accuracy to which the position and orientation of the modules is known. This contribution focuses on the Millepede-II algorithm, one of the two alignment algorithms used by CMS. Recently an advanced track model has been introduced into the CMS alignment procedure, which is based on the "Broken Lines" model and is able to take multiple Coulomb scattering in the detector material properly into account. We show the unique approach needed for solving the alignment problem in a reasonable amount of time. Emphasis is given to the mathematical treatment of the problem.

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