14 December 1992 Possible tem mode competition in gyrotrons with a coaxial cavity
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Proceedings Volume 1929, 17th International Conference on Infrared and Millimeter Waves; 19293Q (1992) https://doi.org/10.1117/12.2298251
Event: 17th International Conference on Infrared and Millimeter Waves, 1992, Pasadena, CA, United States
Abstract
Coaxial structures support the TEM mode, raising the problem of possible TEM mode competition in a gyrotron with a coaxial cavity. Because the TEM mode is non-dispersive, its kz=k=co/c is no longer near zero inside the cavity. This property, coupled with the finite velocity spread of the electron beam, makes the TEM mode can resonate with a wide band of electron cyclotron frequencies. Since there is no cutoff cross section for the non-dispersive mode, if TEM mode oscillation does occur, the RF wave readily goes back to the gun region and may cause serious troubles there. The possibility of TEM mode competition is discussed in this paper.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. Xu, "Possible tem mode competition in gyrotrons with a coaxial cavity", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19293Q (14 December 1992); doi: 10.1117/12.2298251; https://doi.org/10.1117/12.2298251
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