Production design of interdigital-line backward-wave oscillators

This paper gives a brief discussion of the type "O" interdigital line backward wave oscillator theory. The new tube design problems which are encountered in this type of backward wave oscillator and some practical solutions of these problems which have made it possible to fabricate these tubes with modern production methods are described. A description is given of the laminated interdigital line, of the line termination and output transition. A new type of ceramic brazed unitized electron gun designed for these tubes is described. A description of the structure and electrical characteristics of a production S band tube having approximately an octave of voltage tuning will be given as an example of the above work.