Electro-Mechanial Aspects of the Interconnection of the LHC Superconducting Corrector Magnets

In addition to the main 1232 bending dipoles and 474 focusing and defocusing quadrupoles, more than 6800 superconducting corrector magnets are included in the LHC machine. They are housed in the superfluid helium enclosures of the main cryomagnets. Among them, the closed orbit correctors (sextupole and octupole) are inte-grated in the main quadrupole helium vessel and they are powered via an externally routed cryogenic line (line-N). During machine assembly, these corrector magnets have to be connected according to a complex electrical scheme based on the optical requirements of the LHC. Along the 27-km long LHC, 440 interconnection boxes are installed and will allow the powering of the correctors by means of a 42-wire auxiliary bus-bars cable, of which the corresponding wires have to be routed to the main quadrupoles from the interconnection box. Stringent requirements in terms of volume, mechanical resistance, electrical conductance and insulation, reliability, and respect of the electrical schematics apply during the assembly and splicing of the junctions inside the line-N box. The activities and their sequence, aiming at ensuring the fulfilment of these requirements are presented. The planned activities (assembly, ultrasonic welding, general and electrical inspection, and electrical qualification) and the interactions between the various intervening teams are described.