Operation of a largeorbit highharmonic gyrotravelingwave tube amplifier
Abstract
The highharmonic gyrotravelingwave tube (gyroTWT) is a highpower (1kW or more) millimeter wave amplifier based on the synchronous interaction of a beam of largeorbit axisencircling electrons with a highorder cylindrical waveguide mode. Since the interaction occurs at a high harmonic of the cyclotron frequency, the intense magnetic fields required for the conventional fundamentalmode gyroTWT are not required. A proofofprinciple experiment designed to demonstrate the interaction of a 150mA, 350keV electron beam with the TE81 mode of a cylindrical waveguide is described. Principal results include a small signal gain of 10 dB, an interaction bandwidth of 4.3 percent, and a saturated power transfer from electron beam to wave of 0.5 kW. Additional measurements include the dependence of gain on electron beam current and the measurement of the beam's gamma, beta(perpendicular), beta(parallel), and Delta beta(parallel). Sufficient agreement between the experimental results, the simulation codes, and an analytic description of the interaction is demonstrated to permit the design of highperformance millimeter wave amplifiers.
 Publication:

IEEE Transactions on Plasma Science
 Pub Date:
 June 1990
 DOI:
 10.1109/27.55900
 Bibcode:
 1990ITPS...18..313F
 Keywords:

 Cyclotron Resonance Devices;
 Harmonic Generations;
 Millimeter Waves;
 Traveling Wave Amplifiers;
 Traveling Wave Tubes;
 Beam Currents;
 Electron Beams;
 Lorentz Transformations;
 Standing Wave Ratios;
 Electronics and Electrical Engineering