The cure of multibunch instabilities in ELETTRA

Author

Svandrlik, M. ; Bocchetta, C.J. ; Fabris, A. ; Iazzourene, F. ; Karantzoulis, E. ; Nagaoka, R. ; Pasotti, C. ; Tosi, L. ; Walker, R.P. ; Wrulich, A.

Author_Institution

Sincrotrone Trieste, Italy

Volume

4

fYear

1995

fDate

1-5 May 1995

Firstpage

2762

Abstract

ELETTRA is generally working in a multi-bunch filling mode which gives rise to an instability if a parasitic higher order cavity mode (HOM) is coupled to a multi-bunch oscillation mode. Longitudinal instabilities, even if not destructive, are particular harmful for synchrotron light sources, since they increase the energy variation of the beam and deteriorate in this way the quality of the light spectrum multi-bunch instabilities in ELETTRA are cured by tuning the temperatures of the four independent cavities. The effectiveness of the method has been verified by monitoring the spectrum of the SuperESCA beamline. The relation between HOMs and cavity temperature and the variation of this dependence with cavity and machine parameters has been studied. Operational experience and dedicated measurements are presented and compared with theoretical predictions

Keywords

beam handling techniques; electron accelerators; particle beam stability; storage rings; ELETTRA; SuperESCA beamline; cavity temperature; higher order cavity mode; longitudinal instabilities; multi-bunch filling mode; multibunch instabilities; synchrotron light source; Filling; Frequency measurement; Light sources; Monitoring; Radio frequency; Shape measurement; Storage rings; Synchrotrons; Temperature distribution; Tuning;

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.1995.505683

Filename

505683