RESULTS OF FIELD MEASUREMENTS FOR J-PARC MAIN RING MAGNETS

The mass production of J-PARC main ring (MR) magnets had been completed in March 2005. These magnets consist of 97 bending magnets, 216 quadrupole magnets with 11 families and 72 sextupole magnets with 3 families. We have been measured the magnetic field for all of these magnets and we finished it in March 2006. The obtained distributions for the BL products of bending magnets and the GL products of quadrupole magnets are within the required tolerance limits, values of which are estimated by the beam optics for COD correction, etc. The measured multipole components for the bending and the quadrupole magnets are consistent with the designed ones.