Further development of the sextupole and decapole spool corrector magnets for the LHC

In the Large Hadron Collider (LHC) the main dipoles will be equipped with s extupole (MCS) and decapole (MCD) spool correctors to meet the very high de mands of field quality required for the satisfactory operation of the machi ne. Each decapole corrector will in addition have an octupole insert (MCO) and the assembly of the two is designated MCDO, These correctors are needed in relatively large quantities, i.e. 2464 MCS Sextupoles and 1232 MCDO Dec apole-Octupole assemblies. Half the number of the required spool correctors will be made in India through a collaboration between CERN and CAT (Centre for Advanced Technology, Indore, India), the other half will be built by E uropean industry. The paper describes final choices concerning design, mate rials, production techniques, and testing so as to assure economic magnet m anufacture but while maintaining a homogenous magnetic quality that results in a robust product.