Phys. Rev. Lett. 81, 4760–4763 (1998)Ultrahigh Gain Gyrotron Traveling Wave AmplifierReceived 29 July 1998; published in the issue dated 23 November 1998 Mode competition in the gyrotron traveling wave amplifier is shown to be intricately connected to the interplay between the absolute/convective instabilities, circuit losses, and reflective feedback. Physical origins of spurious oscillations are analyzed and characterized. Fundamental understanding of these processes leads to a device concept which provides zero-drive stability at ultrahigh gain. The scheme was verified in a proof-of-principle experiment in the Ka band, producing 93 kW saturated peak power at 26.5% efficiency, 70 dB gain, and a 3 dB bandwidth of 3 GHz. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.4760
DOI:
10.1103/PhysRevLett.81.4760
PACS:
84.40.Ik, 84.40.Fe
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