ABSTRACT
The successes of recent years in the development of methods for generating high-power coherent radiation indicate the possibility of a number of new applications of microwave sources. The variety of generators and amplifiers produce quasi-monochromatic radiation (for heating the plasma at electron cyclotron resonance) and broadband radiation (for visualizing objects and generating radio interference). The designs of relativistic microwave devices are largely similar to classical sources of coherent radiation. In O-type instruments, the magnetic field focusing the electron beam is directed along the axis of the device, i.e., it coincides with the direction of the electric field generated by the accelerating voltage. In such fields a rectilinear electron beam is formed interacting with various microwave structures and transmitting its energy to them. In M-type instruments, the magnetic field is chosen to be normal to the electric field and is used to distort the beam trajectories. Relativistic M-type devices (or devices with crossed fields), using high-current linear induction accelerators as power sources, will be considered in Ch. 4.
