Title :
250-MW X-band TE01 ubitron using a coaxial PPM wiggler
Author :
Balkcum, A.J. ; McDermott, D.B. ; Phillips, R.M. ; Lin, A.T. ; Luhmann, N.C., Jr.
Author_Institution :
Dept. of Appl. Sci., California Univ., Davis, CA, USA
fDate :
6/1/1996 12:00:00 AM
Abstract :
A highly efficient 250-MW X-band ubitron amplifier to drive high gradient linear accelerators is described. The ubitron utilizes periodic permanent magnets with zero guide field and a coaxial circuit operating in the breakdown resistant TE01 mode. Periodic wiggler focusing in a coaxial transmission line allows for stable transport of high-current annular electron beams while producing a strong quiver velocity to drive the ubitron. A large-signal self-consistent simulation code predicts that an efficiency of 37% and a gain of 53 dB can be achieved in a length of 100 cm with a 500-kV 1-kA electron beam, while a tapered wiggler will yield an efficiency as high as 56%
Keywords :
coaxial cables; microwave power amplifiers; microwave tubes; permanent magnets; transmission lines; wigglers; 1 kA; 250 MW; 500 kV; 53 dB; X-band TE01 ubitron amplifier; coaxial PPM wiggler; coaxial circuit; coaxial transmission line; high-current annular electron beams; large-signal self-consistent simulation code; periodic permanent magnets; quiver velocity; tapered wiggler; zero guide field; Coaxial components; Distributed parameter circuits; Electric breakdown; Electron beams; Linear accelerators; Magnetic circuits; Permanent magnets; Predictive models; Tellurium; Undulators;
Journal_Title :
Plasma Science, IEEE Transactions on
