Title :
A comparative study of high power, multistage, X-band TWT amplifiers
Author :
Wang, P. ; Xu, Z. ; Flechtner, D. ; Golkowski, Cz. ; Hayashi, Y. ; Ivers, J.D. ; Nation, J.A. ; Banna, S. ; Schachter, L.
Author_Institution :
Cornell Univ., Ithaca, NY, USA
Abstract :
Our previous work on high-power efficient X-band TWT amplifiers has used a two stage device with bunching produced in a greater than light phase velocity region, immediately followed by a short low phase velocity output structure. The device is driven by a 7 mm diameter 750 kV, 450 A pencil electron beam. The structure, which has a 4 GHz bandwidth in the bunching section, produces an amplified output with a power in the range 20-60 MW. At higher output powers pulse shortening develops. A serious candidate for the pulse shortening is excitation of the HEM11 mode in the structure. This mode overlaps the frequency domain of the desired TM01 mode. We have designed and tested new amplifier structures in which the separation of these modes is substantially increased. The performance of the new amplifier(s) will be compared with that of the older device, and the relevance of the hybrid modes to pulse shortening assessed
Keywords :
accelerator RF systems; microwave power amplifiers; travelling wave amplifiers; 20 to 60 MW; 4 GHz; 750 kV; HEM11 mode; TM01 mode; X-band TWT amplifiers; bandwidth; high power; hybrid modes; multistage; pulse shortening; Bandwidth; Frequency domain analysis; High power amplifiers; Large Hadron Collider; Passband; Periodic structures; Power amplifiers; Power generation; Pulse amplifiers; Silicon carbide;
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.1999.792383
