ABSTRACT

An enormous strength associated with particle accelerators is the ability we have to steer, focus, and otherwise manipulate the charged particle beams. This chapter explains how the standard magnetic field distributions of dipole, quadrupole, and so on can be generated with high quality in the real world using coils and steel poles. It considers many of the practicalities involved in designing and manufacturing highly reliable magnets, either static or time-varying. Finally, the application of the alternative magnet technologies of permanent magnets and superconducting magnets will also be covered. Of course, a perfect multipole only contains one term in the multipole expansion and as such contains no field errors. One of the most daunting things to face a newcomer to the field is being asked to procure a batch of magnets for a particular accelerator project.