Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987230
