Title :
Stable 2 MW, 35 GHz, third-harmonic TE41 gyro-TWT amplifier
Author :
McDermott, D.B. ; Deng, B.H. ; Liu, K.X. ; Van Meter, J. ; Wang, Q.S. ; Luhmann, N.C., Jr.
Author_Institution :
California Univ., Davis, CA, USA
fDate :
6/1/1998 12:00:00 AM
Abstract :
A third-harmonic gyro-TWT amplifier operating in the TE41 mode is described that is predicted to generate 2 MW at 35 GHz. The device is based on the proven concept that the electron beam current can be significantly higher in a stable harmonic gyro-TWT amplifier than at the fundamental due to the comparatively weaker harmonic interaction. For stability, the circuit is sliced to suppress electromagnetic modes without the desired symmetry and the 100 kV, 100 A electron beam from a magnetron injection gun is placed at the null of the strongest remaining gyro-BWO mode. The single-stage gyro-TWT is predicted to produce 2 MW with 20% efficiency, 30 dB saturated gain and 3.5% constant-drive bandwidth
Keywords :
gyrotrons; millimetre wave power amplifiers; travelling wave amplifiers; 100 A; 100 kV; 2 MW; 35 GHz; constant-drive bandwidth; electromagnetic modes; electron beam; electron beam current; gyro-BWO mode; harmonic interaction; magnetron injection gun; stability; third-harmonic TE41 gyro-TWT amplifier; Bandwidth; Cutoff frequency; Cyclotrons; Dispersion; Electromagnetic waveguides; Electron beams; Magnetic circuits; Optical coupling; Saturation magnetization; Tellurium;
Journal_Title :
Plasma Science, IEEE Transactions on
