Improved amplifier performance of the NRL ubitron

D. E. Pershing

doi:10.1117/12.2301429

1 December 1990 Improved amplifier performance of the NRL ubitron

D. E. Pershing

Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 15140J (1990) https://doi.org/10.1117/12.2301429
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States

Abstract

The Vacuum Electronics Branch of the Naval Research Laboratory has an ongoing program to evaluate the potential of the ubitron/FEL interaction as a high-gain, high-power, broad bandwidth micro- or millimeter wave source. Moderate gain operation of the NRL ubitron has been previously reported using a modified SLAC klystron gun. An improvement in the gain has been observed following the installation of a higher current, higher quality electron gun. The maximum gain for a uniform axial field is 20 dB, and substantial gain has been measured over the 12.6 to 17.4 GHz frequency range. Gain is found to be limited by the onset of a high-power oscillation. The oscillation can reach high power levels (⇔ 700 kW) and is dependent on the wiggler field. In addition, it exhibits oscillation thresholds dependent upon both beam voltage and wigglevelocity. The power is also dependent on the axial field profile, and the trim coil current. Both amplifier and oscillator experimental measurements are compared with a fully three-dimensional nonlinear simulation of this configuration using the code ARACHNE.

Citation Download Citation

D. E. Pershing "Improved amplifier performance of the NRL ubitron", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15140J (1 December 1990); https://doi.org/10.1117/12.2301429

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