1 October 1991 Experimental study of a broadband millimeter-wave gyrotron traveling wave amplifier
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Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15762S (1991) https://doi.org/10.1117/12.2297813
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland
Abstract
A wideband low voltage millimeter wave gyrotron traveling wave amplifier (Gyro-TWT) is under investigation at NRL. The device incorporates precise axial tapering of both the magnetic field and the interaction circuit for broadband low voltage operation. The amplifier is a single-stage reflection-type device operating in the TE10 rectangular waveguide mode at the fundamental cyclotron frequency with a 33 kV, 1.6 A beam. By employing an electron beam with α of near 0.6, stable operation is observed at full beam current. Small signal gain in excess of 20 dB is observed over a wide (33%) instantaneous frequency range (27-38 GHz). Using a high power narrowband driver at 35 GHz, saturated efficiencies of about 10% (Pout>5 kW) have been obtained, in good agreement with theory. Attempts to increase the efficiency have been hampered by the onset of in-band oscillations. An experimental study investigating the dependence of the start oscillation current threshold on the relevant experimental parameters (α, magnetic field, reflection coefficient) has been performed.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. S. Park, G. S. Park, } "Experimental study of a broadband millimeter-wave gyrotron traveling wave amplifier", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15762S (1 October 1991); doi: 10.1117/12.2297813; https://doi.org/10.1117/12.2297813
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