ATLAS Superconducting Magnet System Status

The ATLAS particle detector presently being installed at the LHC at CERN requires magnetic field for charged particles bending in an 8000 m
³
volume. A system of four superconducting magnets was designed comprising a central solenoid making 2T for the inner detector as well as two end-cap toroids and a Barrel toroid generating the about one tesla magnetic field for the muon detectors. The magnet system with a stored energy of 1.6 GJ is sized 22 m in diameter and 26 m in length. After about 15 years of design, construction in industry, system integration at CERN and installation in the underground cavern, the completion is imminent. At present, in August 2006, the central solenoid is operational, the Barrel toroid installation complete and 4 K tests in progress and the 2 end cap toroids are being integrated and will soon be installed as well. Magnet services for vacuum, He cryogenics, power converters and circuits as well as controls and safety systems are operational. In the paper the status of the various magnets is reviewed and the first experience and test results with the magnets installed are reported.