Calculations concerning the properties of E-type travelling-wave amplifiers with arbitrary signal level

Abstract

This paper will report on some results concerning E-type amplifiers. In these amplifiers the electrons travel along helical paths and interact with a helically oropagating slow wave (Fig. 1). Neglecting space charge, the distance r_ from the axis ann the d.c. velocity of the equilibrium path, r_Θ_, ^are determined by the radii and the potentials of the inner ana outer electrodes. For a high efficiency, the inner electrode is to be utilized as the slow-wave structure, not the outer electrode as formerly [l] suggested. The outer electrode is at cathode-or at a negative potential, similar to the sole in M-type tubes.