Title :
Transverse impendance of LHC collimators
Author :
Metral, E. ; Arduini, G. ; Assmann, Ralph ; Boccardi, A. ; Bohl, T. ; Caspers, Fritz ; Gasior, Marek ; Jones, Owain Rhodri ; Kasinski, K.K. ; Kroyer, T. ; Redaelli, Stefano ; Robert-Demolaize, G. ; Rumolo, G. ; Steinhagen, R. ; Weiler, T. ; Zimmermann, F.
Author_Institution :
CERN, Geneva
Abstract :
The transverse impedance in the LHC is expected to be dominated by the numerous collimators, most of which are made of Fibre-Reinforced-Carbon to withstand the impacts of high intensity proton beams in case of failures, and which will be moved very close to the beam, with full gaps of few millimetres, in order to protect surrounding super-conducting equipments. We present an estimate of the transverse resistive-wall impedance of the LHC collimators, the total impedance in the LHC at injection and top energy, the induced coupled-bunch growth rates and tune shifts, and finally the result of the comparison of the theoretical predictions with measurements performed in 2004 and 2006 on a prototype collimator installed in the SPS.
Keywords :
collimators; ion accelerators; particle beam bunching; particle beam injection; proton accelerators; proton beams; storage rings; synchrotrons; Fibre-Reinforced-Carbon; LHC collimators; SPS; beam injection; high intensity proton beams; induced coupled-bunch growth rates; prototype collimator; super-conducting equipments; transverse resistive-wall impedance; tune shifts; Cleaning; Collimators; Energy measurement; Impedance; Large Hadron Collider; Particle beams; Performance evaluation; Protection; Stability; Tungsten;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4441125
