Title :
Analysis and applications of quadrature hybrids as RF circulators
Author :
Hanna, S.M. ; Keane, J.
Author_Institution :
Nat. Synchrotron Light Source, Brookhaven Nat. Lab., Upton, NY, USA
Abstract :
The operation of a quadrature hybrid as a power combiner is analyzed. The analytical results are compared with data measured experimentally using a 211 MHz cavity. Graphical solutions of the measured cases are in good agreement with analytical predictions. The use of the 90°-hybrid as an RF circulator is also analyzed. The active operation of the harmonic cavity in the NSLS VUV-ring is used to demonstrate this application. This fourth-harmonic cavity is used to change the shape of the bucket potential to lengthen a stored bunch. Thus, a longer stored-beam lifetime can be achieved without compromising the high brightness of the VUV photon beam. If operated actively, the harmonic cavity would present a mismatched load to an RF generator. Thus, a need exists for a circulator. Similarities in operation between the 90°-hybrid and a circulator are discussed
Keywords :
beam handling equipment; beam handling techniques; cavity resonators; particle accelerator accessories; 211 MHz; 211 MHz cavity; 90°-hybrid; NSLS VUV-ring; RF circulator; RF circulators; RF generator; VUV photon beam; bucket potential; fourth-harmonic cavity; harmonic cavity; high brightness; mismatched load; power combiner; quadrature hybrids; stored bunch lengthening; stored-beam lifetime; Circulators; Impedance; Laboratories; Light sources; Power combiners; Power measurement; Radio frequency; Synchrotrons; Transmitters; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.308665
