Velocity ratio measurement using the frequency of backward wave oscillations

P. Muggli

doi:10.1117/12.2301536

1 December 1990 Velocity ratio measurement using the frequency of backward wave oscillations

P. Muggli

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 (Q_diff=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 = Ω_c/γ - k|| <v||<), the measurement of ωBW, for given Ω_c and γ, yields the value of the velocity ratio (α=<v?</<v||<) and provides a diagnostic for ?. Experimentally, we have measured ωBW while varying I_beam Ω_c. and α. These results will be presented and compared to predictions of linear dispersion relation and of nonlinear simulations.

Citation Download Citation

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); https://doi.org/10.1117/12.2301536

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