A DC design of an X-band traveling-wave tube

Abstract

In this paper a dc design procedure of a X-band traveling-wave tube is described. This procedure consists in determine the geometry of the electron gun, the periodic permanent magnetic and the electron collector. It was found that an electron gun with a 0.26 μPerv, 9.1 kV, 225 mA and 0.6 mm beam radius without electrostatic beam control was suitable for this design. The PPM, constructed with samarium-cobalt magnetics shown a good agreement with theoretical design. Finally a three stage depressed collector, to recover part of non-used electron energy and improve the overall electronic efficiency of TWT, is presented. The simulations were run with Particle-in-cell Studio.