Determination of resonant frequency and external Q values for the BESSY II HOM-damped cavity

Author

Schonfeld, Frank ; Littmann, Bengt

Author_Institution

Tech. Univ. Berlin, Germany

Volume

3

fYear

1995

fDate

1-5 May 1995

Firstpage

1711

Abstract

Damping of higher order cavity modes (HOM´s) is one way to increase the intensity thresholds for multibunch instabilities in B-factories and state of the art synchrotron radiatron sources. Following the idea of Conciauro-Arcioni (1990) one of the simplest geometries is the threefold-symmetry cavity-waveguide structure with a broadband absorber terminating the end of every guide. The iris coupling between the cavity and the waveguide has to be designed so that the fundamental cavity-mode remains nearly unperturbed. The values of the external Q und the shift resonant frequencies due to the waveguide loads is determined and tested by known methods with MAFIA

Keywords

Q-factor; accelerator RF systems; accelerator cavities; electron accelerators; storage rings; BESSY II; HOM-damped cavity; MAFIA; external Q value; fundamental cavity-mode; higher order mode damped cavity; iris coupling; resonant frequency; shift resonant frequency; threefold-symmetry cavity-waveguide structure; Acceleration; Damping; Iris; Loaded waveguides; Production facilities; Prototypes; Resonance; Resonant frequency; Synchrotrons; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505336

Filename

505336