FIELD QUALITY OF THE LHC-IR 1-M MODEL QUADRUPOLE MAGNETS DEVELOPED AT KEK

KEK has constructed five model magnets in a R&D program of the MQXA quadrupole for the LHC interaction region. The last three magnets have a same cross section, which will be applied to the real MQXA magnets. The reproducibility of the magnetic field of these three magnets was studied by the field measurements. The standard deviation and the mean value of the field gradients at 7.3 kA were 0.2 T/m and 219.6 T/m. The multipole components of the three magnets satisfied the accelerator requirement