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1965 by American Air Force Publica American Elsevier amplifier anode applied axial backward-wave bandwidth beam current beam velocity beam voltage cathode cavity characteristics coaxial line collector conductor configurations Copyright coupled-cavity crossed-field crossed-field amplifiers density efficiency electric field electromagnetic electron beam Electron Devices electron gun energy Figure Frequency GHz given in Fig grid gyrotron helix helix TWT high-power IEEE IEEE Trans illustrated in Fig impedance increases indicated in Fig inductive input insulator interaction J.F. Gittins klystron magnetic field Manual by Varian Microwave Tube Manual mode occurs operation oscillations output power peniotron phase velocity power levels Power Travelling Wave pressure Proc propagation Published 1965 pulse pump region Reproduced with permission resonant result RF field secondary emission shown in Fig signal space space-charge forces structure synchronism Technical Digest technique temperature tion Number T.O. Travelling Wave Tubes Tubes by J.F. tuning Varian Associates velocity modulation VSWR waveguide