Application of time-frequency analysis to high-power microwave devices

Christopher W. Peters; William J. Williams; Ronald M. Gilgenbach; Yue Ying Lau; Reginald L. Jaynes; William E. Cohen; Michael R. Lopez; Thomas A. Spencer

doi:10.1117/12.406494

13 November 2000 Application of time-frequency analysis to high-power microwave devices

Christopher W. Peters, William J. Williams, Ronald M. Gilgenbach, Yue Ying Lau, Reginald L. Jaynes, William E. Cohen, Michael R. Lopez, Thomas A. Spencer

Author Affiliations +

Proceedings Volume 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X; (2000) https://doi.org/10.1117/12.406494
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Research is being conducted on high power microwave devices (e.g., gyrotrons) at the University of Michigan. Of utmost concern is the phenomenon of pulse shortening, that is, the duration of the microwave pulse is shorter than the duration of the cathode voltage. For years researchers have applied the Fourier transform to the heterodyned microwave signals. The problem with this technique is that a signal with multiple frequency components has the same spectrum as that of a signal with frequency components emitted at different times. Time-frequency analysis (TFA) using Reduced Interference Distributions provided an entirely different outlook in the community when it was recently applied to heterodyned microwave signals. Results show, with unprecedented clarity, mode hopping, mode competition, and frequency modulation due to electron beam voltage fluctuations. The various processes that lead to pulse shortening may finally be identified. Time resolved maximum intensity of the TFA has produced results very similar to the microwave power signal, verifying the utility of TFA in the analysis of the temporal evolution of power in each mode.

Citation Download Citation

Christopher W. Peters, William J. Williams, Ronald M. Gilgenbach, Yue Ying Lau, Reginald L. Jaynes, William E. Cohen, Michael R. Lopez, and Thomas A. Spencer "Application of time-frequency analysis to high-power microwave devices", Proc. SPIE 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X, (13 November 2000); https://doi.org/10.1117/12.406494

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