TRAVELING-WAVE TUBES 5 



The material covers the radio-frequency aspects of the electronic behavior 

 of the tube and its internal circuit behavior. Matters such as matching into 

 and out of the slow-wave structures which are described are not considered. 

 Neither are problems of producing and focusing electron beams, which 

 have been discussed elsewhere/ nor are those of mechanical structure nor of 

 heat dissipation. 



In the field covered, an effort has been made to select material of practical 

 value, and to present it as understandably as possible. References to vari- 

 ous publications cover some of the finer points. The book refers to experi- 

 mental data only incidentally in making general evaluations of theoretical 

 results. 



To try to present the theory of the traveling- wave tube is difficult with- 

 out some reference to the overall picture which the theory is supposed to 

 give. One feels in the position of lifting himself by his bootstraps. For this 

 reason the following chapter gives a brief general description of the travel- 

 ing-wave tube and a brief and specialized analysis of its operation. This 

 chapter is intended to give the reader some insight into the nature of the 

 problems which are to be met. In Chapters III through VI, slow-wave cir- 

 cuits are discussed to give a qualitative and quantitative idea of their na- 

 ture and limitations. Then, simplified equations for the overall behavior of 

 the tube are introduced and solved, and matters such as overall gain, inser- 

 tion of loss, a-c space-charge effects, noise figure, field analysis of operation 

 and transverse field operation are considered. A brief discussion of power 

 output is given. 



Two final chapters discuss briefly two closely related types of tube; the 

 traveling-wave magnetron amplifier and the double-stream amplifier. 



' loc. cit. 



