Wednesday, April 15, 2015
Abstract-A nonlinear analysis of the terahertz serpentine waveguide traveling-wave amplifier
A nonlinear for the numerical simulation of terahertz serpentine waveguide traveling-wave tube (SW-TWT) is described. In this the electromagnetic wave transmission in the SW is represented as an infinite set of space harmonics to interact with an Analytical expressions for axial in axisymmetric interaction gaps of SW-TWTs are derived and compared with the results from CST simulation. The continuous is treated as discrete macro-particles with different initial phases. The beam-tunnel field equations, space-charge field equations, and motion equations are combined to solve the beam-wave interaction. The influence of backward wave and is also considered in the series of equations. The nonlinear is used to design a 340 GHz SW-TWT. Several favorable comparisons of predictions with results from a 3-D code CHIPIC are presented, in which the output power versus voltage and interaction periods are illustrated. The relative error of the predicted output power is less than 15% in the 3 dB bandwidth and the relative error of the saturated length is less than 8%.The results show that the 1-D nonlinear analysis is appropriate to solve the terahertz SW-TWT operation characteristics.