Field measurements on the HERA E-ring magnets

In the hadron electron ring accelerator storage ring and its injection channels, a total of 454 dipoles, 716 quadrupoles, and 420 sextupoles of various types will be installed. The pole profiles of all magnet types have been designed with the aid of a computer program. Details are given of the devices developed to measure the fields of these magnets as well as the results of the measurements. All magnets were measured using the moving-coil technique. The coil length was chosen to be considerably longer than the iron yoke to include fringe fields and to get integrated values of the main and higher-order poles. On the basis of the statistical data extracted from the measurements carried out, it is concluded that the magnets to be installed will meet projected quality standards.