Velocity ratio measurement using the frequency of backward wave oscillations
The operating diagram of a low-Q TE(0,01) gyrotron at 8 GHz exhibits oscillations at frequencies around 7 and 10 GHz. These frequencies are identified as the backward wave (BW) and forward wave (FW) components of the travelling TE(0,21) mode. As the resonance condition of the BW depends on the average parallel velocity of the beam electrons, the measurement of the BW resonance frequency yields the value of the velocity ratio alpha and provides a diagnostic for it. Experimentally, the frequency has been measured while varying I(beam), omega(c) and alpha. These results are presented and compared to predictions of linear dispersion relation and of non-linear simulations.
Bibliographic Reference: Paper presented: 15th International Conference on Infrared and Millimeter Waves, Orlando, Florida (US), Dec. 10-14, 1990
Availability: Available from (1) as Paper EN 35639 ORA
Record Number: 199110232 / Last updated on: 1994-12-02
Original language: en
Available languages: en