Title :
Measurements of the SPS transverse impedance in 2000
Author :
Arduini, G. ; Burkhardt, H. ; Cornelis, K. ; Klem, J. ; Zimmermann, F. ; Zorzano, M.-P.
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
We report on measurements of coherent tune shifts, head-tail growth rates, and current-dependent betatron phase advances at the CERN SPS in the year 2000. Comparing results obtained at two different energies shows that there is no notable contribution from space charge. Within the measurement resolution the impedance is the same as in 1999, consistent with the expected small effect from changes to only a small number of pumping ports. In 2000, data were taken over an expanded range of chromaticities, which increases the sensitivity to the impedance frequency distribution. Measurements of the current-dependent phase advance around the ring help localizing the most important impedance sources
Keywords :
particle beam bunching; particle beam dynamics; particle beam stability; proton accelerators; proton beams; storage rings; LHC injector; SPS transverse impedance; beam chromaticities; beam parameters; coherent tune shifts; current-dependent betatron phase advances; current-dependent phase advance; head-tail growth rates; impedance frequency distribution; impedance sources; pumping ports; single proton bunch; space charge; Charge measurement; Current measurement; Frequency; Impedance measurement; Large Hadron Collider; Monitoring; Phase measurement; Q measurement; Space charge; Voltage;
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.2001.987274
