Title :
TE21 second-harmonic gyro-TWT amplifier with an axis-encircling beam
Author :
Harriet, S.B. ; McDermott, D.B. ; Luhmann, N.C., Jr.
Author_Institution :
Dept. of Appl. Sci., California Univ., Davis, CA, USA
Abstract :
Summary form only given. A second-harmonic TE21 gyro-TWT with an axis-encircling electron beam is being constructed at University of California Davis (UCD) that is predicted to double the efficiency of our previous 200 kW, 12% efficient MIG TE21(2) gyro-TWT (Wang et al, Phys. Rev. Lett. vol. 75, p. 4322, 1995), where the superscript refers to the harmonic number. The new device will avoid the loss in efficiency due to off-axis electrons interacting with the resulting linearly polarized node. The amplifier is predicted by our large signal code to produce 50 kW in Ka-band with 20% efficiency, 30 dB saturated gain and 3% bandwidth. The 70 kV, 3.5 A axis encircling beam with v⊥/vz=1.2, Δvz/vz=7%, will be produced by a Cusp electron gun delivered by Northrop Grumman.
Keywords :
electron beams; electron guns; gyrotrons; harmonic generation; travelling wave amplifiers; 12 percent; 20 percent; 200 kW; 3.5 A; 30 dB; 50 kW; 70 kV; Cusp electron gun; amplifier bandwidth; amplifier efficiency; axis-encircling electron beam; efficiency loss; harmonic number; large signal code prediction; linearly polarized node; off-axis electron interaction; saturated gain; second-harmonic TE21 gyro-TWT; second-harmonic gyro-TWT amplifier; Cathodes; Electrons; Frequency; Insertion loss; Magnetic analysis; Magnetic field measurement; Magnetic fields; Power amplifiers; Power generation; Tellurium;
Conference_Titel :
Vacuum Electronics Conference, 2002. IVEC 2002. Third IEEE International
Print_ISBN :
0-7803-7256-5
DOI :
10.1109/IVELEC.2002.999292
