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Proceedings Paper

Operation Of A Compact MM-WAVE High-Harmonic Gyrotron
Author(s): D. B. McDermott; N. C. Luhmann
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Paper Abstract

The operation of a millimeter-wave harmonic gyrotron is described in which the interaction is between large-orbit axis-encircling electrons and cylindrical cavity TEn11 modes. Gyrotron cavities operating on this principle are well matched to low current, moderate energy, rf-accelerated electron beams (- 100 mA, - 250 keV). Efficiencies up to 15% have been measured for moderate harmonic interactions and multi-kW power levels have been attained at the eleventh harmonic of the cyclotron frequency. The concept allows the magnetic field of the gyrotron to be reduced by an order of magnitude, thereby making a submillimeter-wave gyrotron feasible. However, mode competition problems must be considered for high-harmonic, submillimeter wave operation. We have been successful in suppressing mode competition by destroying unwanted modes. The beam current required for oscillation is highly dependent on the electron perpendicular energy. The energy requirement can be reduced by dielectric loading of the gyrotron cavity. We have also begun testing a 30 dB gain, twelfth-harmonic gyro-klystron amplifier.

Paper Details

Date Published: 14 October 1983
PDF: 8 pages
Proc. SPIE 0423, Millimeter Wave Technology II, (14 October 1983); doi: 10.1117/12.936165
Show Author Affiliations
D. B. McDermott, UCLA, Electrical Engineering (United States)
N. C. Luhmann, UCLA, Electrical Engineering (United States)


Published in SPIE Proceedings Vol. 0423:
Millimeter Wave Technology II
James C. Wiltse, Editor(s)

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