The superconducting magnet system for the ATLAS detector at CERN

The superconducting magnet system for the ATLAS Detector for the Large Hadr on Collider at CERN is under construction since 1997, The magnet system is a hybrid of 4 superconducting magnets, a 2.5 m bore, 5.3 m long 2 T central solenoid servicing the inner detector and three 4 T toroids with global di mensions of 20m diameter, 25m long providing the magnetic field of about I T for the muon detectors. The operating currents of the solenoid and toroid s are 8 and 20 kA respectively with a total stored energy of 1.6 GJ, The re alization of the system is challenging due to its unusual size and complexi ty. Last year the construction of the coils and cryostats has commenced in industry. The manufacturing of the solenoid cold mass is already finished a nd the delivery of the individual toroid coils will commence in 2001, On-su rface test of all magnets is obvious where after installation in a new cave rn 100 m underground will start in 2003 leading to a commissioning of the e ntire magnet system in early 2005, In the paper the various magnets are int roduced as well as the common infrastructure and services required, The sta tus of the project is reviewed.