Switching power supply regulation of storage ring magnets

Future accelerators will require greater flexibility in the design and implementation of their optical functions. One of the most cost-effective solutions for the powering of linear and non-linear focusing elements is the use of modern, high efficiency switching power supplies. These types of power supplies are in use in a number of accelerators and being planned for accelerators under construction. This paper will focus on non-resonant switching regulators and discuss the general configuration of a system of magnet power supplies, the principles of the electronic circuit designs, the typical cost of such a system and the power supply performance, including regulation, stability and reliability. It will also present some general diagnostics for systems of large numbers of power supplies and some discussion of the operational benefits from the individual powering of all focusing elements. Since 1977 this type of chopper regulator has demonstrated its excellent performance for the independent control of the quadrupole, sextupole and steering magnets in CESR (Cornell Electron Storage Ring); a number of practical considerations from this experience will be included throughout the discussion