ABSTRACT
This chapter follows the path of the radio-frequency power from the wall-plug to the beam. First the power sources, such as klystrons are discussed, followed by the wave guides and antennas that couple the power to the accelerating cavities. The next section covers losses in the cavities and its so-called Q–value and addresses accelerating structures, used in linear accelerators, disk-loaded waveguides. The analysis is complemented by using the PDE toolbox to numerically calculate the consequences of defects in the cavities. Technological aspects of normal and super-conducting cavities are briey covered. The final sections of this chapter address the interaction of the beam with the cavity: beam loading under steady-state and transient conditions and how to correct it with feedback systems.
