Observation of bunch motion due to the longitudinal dipole-coupled bunch instability at CESR

Author

Holtzapple, R. ; Billing, M.

Author_Institution

Cornell Univ., Ithaca, NY, USA

Volume

3

fYear

2001

fDate

2001

Firstpage

1927

Abstract

In the past a longitudinal dipole-coupled bunch instability had limited high current operation at CESR and resulted in a degradation of luminosity performance. A longitudinal feedback system successfully damps this instability and the exchange of superconducting RF cavities for normal conducting RF cavities in CESR has further reduced the instability´s strength. In this paper measurements of the longitudinal dynamics using a dual-axis synchroscan streak camera are presented. The measurements were made on single trains of bunches and give a characterization of the instabilities and modes of oscillation

Keywords

accelerator RF systems; accelerator cavities; electron accelerators; electron beams; particle beam bunching; particle beam diagnostics; particle beam stability; storage rings; streak cameras; CESR; bunch motion; dual sweep synchroscan streak camera; dual-axis synchroscan streak camera; high current operation; instability damping; longitudinal dipole-coupled bunch instability; longitudinal dynamics; longitudinal feedback system; luminosity performance; normal conducting RF cavities; oscillation modes; single bunch trains; superconducting radiofrequency cavities; Cameras; Current measurement; Data mining; Degradation; Electrons; Feedback; Pixel; Positrons; Radio frequency; Synchrotrons;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.987230

Filename

987230