Experimental study of a broadband millimeter-wave gyrotron traveling wave amplifier

G. S. Park

doi:10.1117/12.2297813

1 October 1991 Experimental study of a broadband millimeter-wave gyrotron traveling wave amplifier

G. S. Park

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% (P_out>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.

Citation Download Citation

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); https://doi.org/10.1117/12.2297813

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