STATUS REPORT ON FIELD QUALITY IN THE MAIN LHC DIPOLES

We give the present status of the field quality in the main LHC dipoles. Special emphasis is given to the collared coil data: a few tens of coils have been built, allowing a first analysis of the variability between producers, and es-timates of the random part. Effects of the corrective ac-tions implemented to fine tune the systematics components of low-order multipoles are presented. Correlations of col-lared coil data to the magnetic field measurements in op-erational conditions are discussed. Comparison to specifi-cations imposed by beam dynamics allows to pin out the most critical requirements that will have to be met during the LHC dipole production.