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Proceedings Paper

Operation Of A Gyrotron At The Fundamental And Second Harmonic
Author(s): R. J. Temkin; K. E. Kreischer
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Paper Abstract

A formalism is developed for determining the possibility of operation of a gyrotron at both the fundamental, w = wc in a TEmpq mode and at the second harmonic, w' = 2wc, in a TEm'p'q' mode. This formalism is then applied to two physical problems. First, the conditions are derived for conversion of a gyrotron from operation at w = wc to operation at w' = 2wc. Such a conversion is shown to be most practical when the mode at w = wc is a higher order mode (m or p large) and/or the beam position is at a higher radial maximum. Several specific examples are considered. Second, the conditions are derived for oscillation of a parasitic mode at w = wc in a gyrotron designed for operation at w' = 2wc. Again, this problem is more severe for higher order modes and beams at larder radii. For a whispering gallery mode TEm'11 oscillating at w' = 2wc, if m' is odd, there is a resonant para-sitic whispering gallery mode TEmll at w = wc, with m = 0.5 (m' - 1). This would be expected to spoil the 2wc operation of all TEmy 11 modes, with m' odd.

Paper Details

Date Published: 27 February 1981
PDF: 13 pages
Proc. SPIE 0259, Millimeter Optics, (27 February 1981);
Show Author Affiliations
R. J. Temkin, Massachusetts Institute of Technology (United States)
K. E. Kreischer, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 0259:
Millimeter Optics
George A. Tanton, Editor(s)

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