Alignment strategy for the CMS Tracker

The CMS Tracker measures the momentum of charged particles created in proton-proton interactions with 14\,TeV nominal center-of-mass energy close to the interaction region. Its excellent single-point position resolution of 9--60\,$\mu$m\ is far below typical construction tolerances, and together with its high granularity renders the alignment a demanding task, which needs to aim at micro-meter level precision. A strategy to align the CMS tracker with its 15\,148 silicon strip and 1\,440 silicon pixel modules, starting from survey measurements during construction, incorporating information from the laser hardware monitoring system and finally using collision and non-collision tracks for highest precision has been developed and is detailed in this article.