Synchrotron Magnets for the SNS

The design and construction of the magnets for the 800MeV proton synchrotron which forms part of the Spallation Neutron Source is described. Operating at 50Hz, the design intensity of 2.5×1013 protons per pulse imposes stringent conditions on design and hardware, and requires that maintenance philosophy should be determined well in advance. The parameters of the main ring dipoles and quadrupoles are largely dictated by the fact that they must form a suitable load for the resonant power supply, inherited from Daresbury Laboratory's NINA electron accelerator. Programmable correction quadrupoles and octupoles are required to provide ramped fields during the 480?sec-long injection period.