Title :
Longitudinal coupled-bunch instabilities in the CERN PS
Author :
Damerau, H. ; Hancock, S. ; Rossi, C. ; Shaposhnikova, E. ; Tuckmantel, J. ; Vallet, J.-L. ; Mehler, M.
Author_Institution :
CERN, Geneva
Abstract :
Longitudinal coupled bunch instabilities in the CERN PS represent a major limitation to the high brightness beam delivered for the LHC. To identify possible impedance sources for these instabilities, machine development studies have been carried out. The growth rates of coupled bunch modes have been measured, and modes have been identified using mountain range data. Growth rate estimations from coupled bunch mode theory are compared to these results. It is shown that the longitudinal impedance of the broad resonance curve of the main 10 MHz RF system can be identified as the most probable source. Several modes are driven simultaneously due to the large width of the resonance, which is considered for the analysis.
Keywords :
accelerator RF systems; accelerator cavities; beam handling techniques; particle beam bunching; particle beam stability; proton accelerators; synchrotrons; CERN PS; LHC; RF cavities; coupled bunch modes; growth rate estimations; high brightness beam; impedance sources; instabilities; longitudinal coupled bunch instabilities; machine development; Acceleration; Brightness; Frequency measurement; Impedance; Large Hadron Collider; Optical coupling; Power harmonic filters; Radio frequency; Radiofrequency identification; Resonance;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4439978
