Development of superconducting sextupole and decapole spool corrector magnets at CAT for the main dipole of Large Hadron Collider (LHC)

Superconducting (Sc)-corrector magnets are one of the important Indian contributions to LHC under construction at Geneva, Switzerland. Under DAE-CERN collaboration we embarked on the development of these magnets at CAT. This involved making prototype to validate basic design, then incorporate engineering design features and develop all tooling, machines to suit large production lot. We started the work in close collaboration with LHC/ICP, CERN and developed necessary tooling and fixtures, machining methods for intricate shape coil supports, Sc coil winding machines, test-equipment for warm and cold testing etc and made several prototypes. These prototypes were tested at CAT and CERN at warm and at 4.2 and 1.8K for acceptance. This paper describes salient features of prototype development at CAT. (author)