"Klystrons, Traveling Wave Tubes, Magnetrons, Crossed-Field Amplifiers, and Gyrotrons"
The subject matter of the book and related courses
 can be divided into two broad categories.
Device technology: operating principles of specific tube types; Klystrons,
Traveling Wave Tubes, Magnetrons, Crossed-Field Amplifiers, and Gyrotrons.
Support technology: discussions of technical areas, such as electron dynamics, vacuum technology and breakdown phenomena, that apply to all tube types.
Sample Figures for Device Technology 
Gyrotrons
Klystrons
Sample Figures for Support Technology 
Breakdown
Cathodes

Contents