Synthesis of technological developments for the B0 model coil and the ATLAS Barrel Toroid coils

The Barrel Toroid Magnet is: part of the Magnet System of the ATLAS Detecto r for the LHC. It provides the magnetic field required by the muon spectrom eter. It consists of eight flat superconducting coils and will extend over a length of 26 meters with an inner bore of 9 meters and an outer diameter of 20 meters. The general design (pancakes, coil casing, tie rods, circular cryostats and warm voussoirs) has been presented in MT15. The present pape r concentrates on the technological developments for the B0 model roil and for the BT coils : industrial production of conductor, welding technique fo r the coil casing, prestress of the coil with bladders, cold to warm suppor ts, construction and assembly of the cryostat.