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

Volume

5

fYear

1999

fDate

1999

Firstpage

3600

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.792383

Filename

792383