Title :
High efficiency TWT amplifiers
Author :
Naqvi, S. ; Kerslick, G.S. ; Nation, J.A. ; Wang, Q.
Author_Institution :
Sch. of Electr. Eng. & Lab. of Plasma Studies, Cornell Univ., Ithaca, NY, USA
Abstract :
We report on a research program to increase the efficiency of relativistic traveling wave amplifiers to >50%. The two stage amplifier consists of a bunching periodic structure with phase velocity significantly higher than the beam velocity and a decelerating section with phase velocity significantly lower than the beam velocity. The position of the decelerating stage with respect to the bunching stage is chosen such that the narrowest bunches are sustained in the decelerating field for the longest possible time before significant debunching occurs. Two schemes are under investigation. In the first scheme, a resistive server is placed between the two stages to suppress temporal phenomena. In the second scheme, the bunching and deceleration stages merge into each other by a gradual change in the iris radius over a wavelength
Keywords :
accelerator RF systems; microwave generation; particle beam bunching; travelling wave amplifiers; accelerator RF system; bunching periodic structure; debunching; deceleration stages; high efficiency TWT amplifiers; iris radius; microwave source; phase velocity; relativistic traveling wave amplifiers; resistive server; two stage amplifier; Coaxial components; Electromagnetic fields; Electron beams; Energy conversion; Geometry; Iris; Klystrons; Laboratories; Plasma waves; Radio frequency;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.753127
