Some aspects of circuit power dissipation in high power CW helix traveling-wave tubes, part II: Scaling laws

This paper extends the basic theory of the thermal behavior or helix-type slow wave circuits described in Part I [1] to show the effect of scaling to higher frequencies. The differences in the scaling laws which result from the alternative assumptions of constant beam voltage or constant beam perveance are discussed, and a simplified formulation permitting the thermal behavior to be described in terms of universal curves is presented.