The Development of the Inner Triplet Dipole Corrector (MCBX) for LHC

A prototype of the MCBX correction dipole magnet is being built in industry. It features a horizontal dipole nested inside a vertical dipole The coils of the 0.6 m long single-bore magnet are wound with 7 or 9 rectangular superconducting wires pre-assembled as flat cables. As the end fields contribute for more than 50 % to the field integral an optimisation in 3D was required. The impregnated coils containing CNC-machined end spacers are pre-compressed with an aluminium shrinking cylinder. The yoke consists of scissor-laminations to back up the coil rigidity and to centre the coil assembly. These laminations move inward during the cooldown and the movement is blocked at a pre-defined temperature building-up a circumferential stress in the stainless steel outer shell. This paper describes the magnetic and mechanical design of this magnet. The expected performance from the calculations is presented. The assembly procedure is reviewed and the experience with the 250 mm long mechanical model is reported.