Construction and Commissioning of the Magnets for the OPERA Experiment

The construction and commissioning of the 990-ton gapless iron magnets for the OPERA experiment is presented. These magnets have been built in a deep underground hall of the Gran Sasso laboratories between 2003 and 2006 and they have been switched on for the first time in March 2006. In this poster we discuss the mechanic, electric and thermal characterization of these devices as well as measurements of the magnetic field by means of pickup coils. Moreover, we discuss the commissioning of the auxiliary systems (power supply, water cooling plant); first neutrino beam has been sent in August 2006 and is also reported.