DESIGN, FABRICATION AND COLD TESTS OF A SUPERFERRIC OCTUPOLE CORRECTOR FOR THE LHC

In the correction scheme of the LHC it is planned to install octupole corrector magnets in the short straight section of the lattice. Initia lly these correctors were distributed windings on the cold bore tube n ested in the tuning quadrupoles. The latter being suppressed a new com pact superferric design was chosen for the octupole prototype, suitabl e for a two-in-one configuration. This prototype was designed by CERN and CEDEX/Spain, built at INDAR/Spain and tested at CEDEX. The paper r eports on the design of the prototype, describes the fabrication and a ssembly and presents the measurement results; special interest has bee n taken to design a simple and compact magnet, easy to fabricate and t raining free below nominal field. First results show the feasibility o f the solution which will be finally confirmed by magnetic measurement s.