Linear analysis of traveling sheet electron beam in sine waveguide tubes

A theoretical model is proposed for linear analysis of the beam-wave interaction in a sine waveguide (SWG) with slow-wave structure. The field expressions and hot dispersion equation are obtained by means of field matching. The ohmic loss and attenuation constant due to imperfect conductors are also derived using the theoretical model. Moreover, the effects of voltage, current, beam thickness, period, and oscillation amplitude on the linear gain and bandwidth are calculated. The results indicate a peak gain and 3-dB bandwidth of 6.82 dB/cm and 19.5%, respectively, for a 0.22-THz SWG traveling-wave tube upon selecting reasonable structural parameters and electron-beam dimensions. Furthermore, by considering the ohmic losses for the finite conductivities of 5.8 x 10(7) S/m and 2.2 x 10(7) S/m, the theoretical results are compared with those of particle-in-cell simulations performed using Computer Simulation Technology Particle Studio. Published by AIP Publishing.