Experiments on slotted coaxial high-power gyrotrons

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

doi:10.1117/12.391801

14 July 2000 Experiments on slotted coaxial high-power gyrotrons

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

Author Affiliations +

Proceedings Volume 4031, Intense Microwave Pulses VII; (2000) https://doi.org/10.1117/12.391801
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

This research program investigates high power microwave generation utilizing a microsecond electron beam accelerator to study means of eliminating microwave pulse-shortening. The particular device under study is the coaxial gyrotron oscillator in the S-band frequency range. Experiments have concentrated on three types of gyrotron cavities: (1) coaxial, unslotted, (2) coaxial, slotted, and (3) noncoaxial, unslotted. The first major result is that the coaxial rod raises the limiting current in the e-beam diode, permitting reliable, higher current extraction into the microwave tube. The second major finding is that the slotted cavity gives the highest peak powers (approximately 90 MW) but very short pulselengths (approximately 10 - 20 ns). The unslotted coaxial gyrotron emits power levels of 20 - 40 MW with longer pulselengths (up to 40 ns). The noncoaxial gyrotron radiates lower peak power levels (approximately 20 MW). All of the gyrotron types exhibited signs of the pulse shortening mechanisms of mode hopping and mode competition as diagnosed by time-frequency-analysis (TFA). TFA also shows that lower power microwave oscillation is maintained over some 300 ns, but the power level may be modulated due to e-beam voltage fluctuations.

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Ronald M. Gilgenbach, Reginald L. Jaynes, William E. Cohen, Christopher W. Peters, Michael R. Lopez, Yue Ying Lau, William J. Williams, and T. A. Spencer "Experiments on slotted coaxial high-power gyrotrons", Proc. SPIE 4031, Intense Microwave Pulses VII, (14 July 2000); https://doi.org/10.1117/12.391801

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