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

fYear

1993

fDate

17-20 May 1993

Firstpage

1118

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.308665

Filename

308665