Operation Of A Compact MM-WAVE High-Harmonic Gyrotron

D. B. McDermott; N. C. Luhmann Jr.

doi:10.1117/12.936165

14 October 1983 Operation Of A Compact MM-WAVE High-Harmonic Gyrotron

D. B. McDermott, N. C. Luhmann Jr.

Proceedings Volume 0423, Millimeter Wave Technology II; (1983) https://doi.org/10.1117/12.936165
Event: 27th Annual Technical Symposium, 1983, San Diego, United States

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.

Citation Download Citation

D. B. McDermott and N. C. Luhmann Jr. "Operation Of A Compact MM-WAVE High-Harmonic Gyrotron", Proc. SPIE 0423, Millimeter Wave Technology II, (14 October 1983); https://doi.org/10.1117/12.936165

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