Observations of a longitudinal coupled bunch instability in CESR

Author

Billing, M.G. ; Belomestnykh, S.

Author_Institution

Lab. of Nucl. Studies, Cornell Univ., Ithaca, NY, USA

Volume

2

fYear

1999

fDate

1999

Firstpage

1112

Abstract

During the last several years of operating with trains of bunches, a longitudinal dipole coupled bunch instability has been observed at the Cornell Electron Storage Ring (CESR). Without the use of multibunch longitudinal feedback this instability would limit the total stored current in the two beams during High Energy Physics operation. This paper gives an updated report on observations of this instability, its strength, its dependence on bunch spacing within in the trains, its relationship to changes made in the RF accelerating system and results of simulations using the observed mode spectra of the RF cavities

Keywords

accelerator RF systems; accelerator cavities; electron accelerators; particle beam bunching; particle beam stability; storage rings; CESR; Cornell Electron Storage Ring; RF accelerating system; RF cavities; bunch spacing; longitudinal coupled bunch instability; longitudinal dipole coupled bunch instability; mode spectra; Acceleration; Damping; Electron beams; Feedback; Optical coupling; Particle beams; Positrons; Radio frequency; Synchrotrons; Threshold current;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.795465

Filename

795465