DESIGN AND TEST OF THE BENCHES FOR THE MAGNETIC MEASUREMENT OF THE LHC DIPOLES

The magnetic measurement of more than 1300 LHC dipoles comprises the c ontent of higher harmonic field components, field direction and field integrals. The measurements will be carried out along a warm bore inst alled inside the magnet cold bore, thus allowing the use of rotating c oils at room temperature. This coll, together with Hall and NMR detect ors is mounted at one end of a 12.5 m long shaft which is specially de signed for very high rotational stiffness and which is controlled from its far end by a motor, an angular encoder and a level meter, all sta ndard components placed outside the magnetic field without space restr ictions. Particular emphasis has been put on the user-friendliness of the bench and its automated, computer-controlled operation requiring a minimum of staff, an important issue during production measurements o f large series of magnets. The bench and its performance and precision achieved during its commissioning are described.