Operational Experience and Performance of the Present ALICE ITS

ALICE (A Large Ion Collider Experiment) is one of four major experiments at the CERN LHC. ALICE studies strongly interacting matter under extreme conditions created in heavy ion colli- sions. The Inner Tracking System (ITS) is an essential part of the ALICE detector. It is used for tracking, reconstruction of primary and secondary vertices and particle identification. ITS is composed of six cylindrical layers of silicon detectors. Three different techologies are used: hybrid pixel, drift and strip detectors. The ITS was fully commisioned in 2009 at the start of LHC Run 1. The detectors showed good performance during this period contributing to several important measurements. During the LHC Long Shutdown 1 (LS1) the ITS underwent general consolidation and is now ready for the next LHC run