Photonic-Band-Gap Traveling-Wave Gyrotron Amplifier
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Nanni-2013-Photonic-band-gap.pdf
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Author(s)
Nanni, Emilio Alessandro
Lewis, Samantha M.
Griffin, Robert Guy
Shapiro, B.
Temkin, Richard J
Date Issued
December 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Nanni, E., S. Lewis, M. Shapiro, R. Griffin, and R. Temkin. “Photonic-Band-Gap Traveling-Wave Gyrotron Amplifier.” Physical Review Letters 111, no. 23 (December 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We report the experimental demonstration of a gyrotron traveling-wave-tube amplifier at 250 GHz that uses a photonic band gap (PBG) interaction circuit. The gyrotron amplifier achieved a peak small signal gain of 38 dB and 45 W output power at 247.7 GHz with an instantaneous −3 dB bandwidth of 0.4 GHz. The amplifier can be tuned for operation from 245–256 GHz. The widest instantaneous −3 dB bandwidth of 4.5 GHz centered at 253.25 GHz was observed with a gain of 24 dB. The PBG circuit provides stability from oscillations by supporting the propagation of transverse electric (TE) modes in a narrow range of frequencies, allowing for the confinement of the operating TE[subscript 03]-like mode while rejecting the excitation of oscillations at nearby frequencies. This experiment achieved the highest frequency of operation for a gyrotron amplifier; at present, there are no other amplifiers in this frequency range that are capable of producing either high gain or high output power. This result represents the highest gain observed above 94 GHz and the highest output power achieved above 140 GHz by any conventional-voltage vacuum electron device based amplifier.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
MIT Nuclear Reactor Laboratory
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.235101
