The ATLAS Superconducting Magnet System: Status of Construction & Installation

The ATLAS High Energy Physics Experiment at the Large Hadron Collider at CERN is equipped with a hybrid system of four superconducting magnets. A Central Solenoid provides the magnetic field for the inner detector while 2 End-cap Toroids and a Barrel Toroid generate the magnetic field for the muon detectors. The magnet system has a stored energy of 1.6 GJ and is sized 22 m in diameter and 26 m in length. Construction of the magnets started in 1998 and will continue until summer 2006 with the completion of the integration and test of the last coils on surface. Currently, in September 2005, all magnet parts were manufactured and delivered to the integration site at CERN. The 8 coils for the Barrel Toroid were completed and successfully tested while the integration of both End Cap Toroids is progressing well. The Barrel Toroid and the Central Solenoid are already installed in the ATLAS cavern 100 m underground. Tests of the magnets underground will start in autumn 05 after completion of the connections to the vacuum system, He cryogenics and power converters