Design report of the MBG main bending dipoles for the proton transfer line TT41 of CNGS

This report presents the design and magnetic field models of the MBG main bending dipole for the “CERN Neutrino to Gran Sasso” transfer line TT41. The MBG are resistive iron-dominated H-type magnets of 37 mm gap height and 6.3 m core length. A coil composed of two half-coils of 6 1/2 turns each will allow for two-way series connection of the entire dipole line without external return bus-bars. The core consists of 1 mm thick low carbon steel laminations with organic insulation coating, precision punched and stacked between massive end and angular plates.