In the work shows a way of developing the theory of nonlinear non-stationary two-beam traveling wave tube with a codirected beams, based on the nonlinear theory of traveling wave tube with a single electron beam.
Non-linear nonstationary theory of two-stream amplifier has been suggested for case of co- and opposite directed beams. Non-linear theory has been compared with calculation of linear theory for both cases.
An approximate nonlinear theory of double-stream interaction is built. Based on this theory, calculation for double-stream amplifier gain was performed. It was shown, that 40 dB amplification can be obtained.
