1 December 1990 Velocity ratio measurement using the frequency of backward wave oscillations
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Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 15143I (1990) https://doi.org/10.1117/12.2301536
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States
Abstract
The operating diagram of a low-Q (Qdiff=160) TE°01 gyrotron at 8GHz exhibits oscillations at, frequencies in a range around both 7 and 10GHz. These frequencies are identified as the backward wave (BW) and forward wave (FW) components of the traveling TE°21 mode. As the resonance condition of the BW depends on the average parallel velocity (<v||<) of the beam electrons (ωBW = Ωc/γ - k|| <v||<), the measurement of ωBW, for given Ωc and γ, yields the value of the velocity ratio (α=<v?</<v||<) and provides a diagnostic for ?. Experimentally, we have measured ωBW while varying Ibeam Ωc. and α. These results will be presented and compared to predictions of linear dispersion relation and of nonlinear simulations.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
P. Muggli, P. Muggli, } "Velocity ratio measurement using the frequency of backward wave oscillations", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15143I (1 December 1990); doi: 10.1117/12.2301536; https://doi.org/10.1117/12.2301536
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