Abstract
Abstract| A linear theory is used to study the beam-wave coupling in a double-beam gyrotrontraveling wave amplifler (Gyro-TWA). Numerical results show that the beam-wave coupling inthis type of amplifler excites six waves, which include one constant-amplitude backward wave,and flve forward waves consisting of two growing waves, two decaying waves and one constant-amplitude wave. The growing wave, whose growth rate is much larger than that of the other,has a larger operating bandwidth which is approximately the superposition of the interactionbandwidths of the two single-beams in the Gyro-TWA.DOI: 10.2529/PIERS0609062117151. INTRODUCTION High power and broad bandwidth capability of the gyrotron traveling wave amplifler makes it anattractive source of coherent radiation in the millimeter and sub-millimeter wavelength ranges.Gyro-TWAs are applied very broadly, especially in radar and communication systems. Steadyprogress in theory and experiment has been made over an extended period of time. Major advancesin Gyro-TWA performances have been reported in the review papers [1{3].The Gyro-TWA interaction comes from the coupling between the electron beam cyclotron modeand the waveguide mode, which respectively satisfy
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