Title :
TWT amplifier using a ferroelectric cathode for electron beam generation
Author :
Hayashi, Y. ; Ivers, J.D. ; Flechtner, D. ; Nation, J.A. ; Wang, P. ; Banna, S. ; Schächter, L.
Author_Institution :
Cornell Univ., Ithaca, NY, USA
Abstract :
We report first experiments on high-power traveling wave amplifiers using an electron beam generated with a ferroelectric cathode. The electron beam, which is driven by a ferrite core transformer-pulse line system, has energy of 440 keV and a beam current of 40-50 Amperes. The beam pulse duration is about 250 ns and the system is operated at 0.07 Hz. The beam is generated from a command switched ferroelectric cathode located in the fringing field of a solenoid. A single stage disk loaded TWT structure is used as the ~9 GHz amplifier. A gain of 10 dB is observed over the frequency range from 8.9 to 9.4 GHz. The main purpose of the experiment is to demonstrate that the ferroelectric generated beam is of good enough quality for microwave amplification in X band, and to pave the way for use of this cathode in future high power microwave source experiments. We compare the results obtained using this system with the output from a PIC code simulation
Keywords :
cathodes; electron sources; ferroelectric devices; microwave power amplifiers; travelling wave tubes; 10 dB; 440 keV; 8.9 to 9.4 GHz; 9 GHz; PIC code; TWT amplifier; X band; beam pulse duration; disk loaded TWT structure; electron beam; ferrite core transformer; ferroelectric cathode; gain; traveling wave amplifiers; Cathodes; Electron beams; Ferrites; Ferroelectric materials; High power amplifiers; Pulse amplifiers; Pulse generation; Pulse transformers; Solenoids; Transformer cores;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.792385
