Experimental studies of a four-cavity, 35 GHz gyroklystron amplifier

Author

Garven, M. ; Calame, J.P. ; Nguyen, Khanh T. ; Danly, Bruce G. ; Levash, B. ; Wood, F.N.

Author_Institution

Maryland Univ., College Park, MD, USA

Volume

28

Issue

3

fYear

2000

fDate

6/1/2000 12:00:00 AM

Firstpage

672

Lastpage

680

Abstract

The experimental results from a four-cavity, Ka-band gyroklystron amplifier operating in the(TE)₀₁₁ cylindrical mode at the fundamental of the cyclotron frequency are presented. A peak output power of 208 kW at 31.90 GHz, with a 3-dB bandwidth of 178 MHz (0.5%), an electronic efficiency of 30%, and a saturated gain of 53 dB was obtained with a 72-kV, 9.6-A electron beam at a magnetic field of 12.95 kG and a measured beam velocity ratio of 1.36. The magnetic field was found to have a strong influence on the power-bandwidth tradeoff. At 13.35 kG, a peak output power of 174 kW at 31.90 GHz, with a 3-dB bandwidth of 240 MHz (0.7%), an electronic efficiency of 25%, and a saturated gain of 56 dB was obtained with the same beam parameters. The gyroklystron amplifier was unconditionally stable at these operating points and stability studies are reported. Experimental results were found to be in excellent agreement with large signal simulations.

Keywords

gyrotrons; klystrons; millimetre wave amplifiers; (TE)₀₁₁ cylindrical mode; 12.95 kG; 13.35 kG; 174 kW; 178 MHz; 208 kW; 240 MHz; 25 percent; 30 percent; 34.90 GHz; 53 dB; 56 dB; 72 kV; 9.6 A; Ka-band gyroklystron amplifier; bandwidth; cyclotron frequency fundamental; electron beam; electronic efficiency; four-cavity 35 GHz gyroklystron amplifier; gyroklystron amplifier; large signal simulations; magnetic field; millimetre wave amplifier; operating points; peak output power; saturated gain; Bandwidth; Cyclotrons; Electron beams; Frequency; Gain; Klystrons; Magnetic field measurement; Power amplifiers; Power generation; Power measurement;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.887699

Filename

887699