Calculation of Optimum Operating Parameters for a Gyrotron Travelling Wave Amplifier.

摘要

Optimum operating parameters are determined for a new type of high power,high efficiency generator of millimeter waves known as a gyrotron travelling wave amplifier. In the example considered,wave amplification results from the interaction of a TE(01) waveguide mode with the fundamental cyclotron harmonic of an electron beam. The parameter optimization involves the determination of the point of maximum device efficiency as a function of beam density,beam energy,beam positioning,and external magnetic field for the output power required. An analytical linear theory and a numerical simulation code form the basis of theoretical calculations. As a result of the extensive survey in parameter space,the peak efficiency in the beam frame has been found to exceed 70%. This result has been applied to the specific design of a 35GHz amplifier with output power approximately 340kW, a power gain of 2db/cm,and a laboratory frame efficiency of 51%. (Author)