DocumentCode :
2860214
Title :
Nominal longitudinal parameters for the LHC beam in the CERN SPS
Author :
Baudrenghien, P. ; Bohl, T. ; Linnecar, T. ; Shaposhnikova, E. ; Tuckmantel, J.
Author_Institution :
CERN, Geneva, Switzerland
Volume :
5
fYear :
2003
fDate :
12-16 May 2003
Firstpage :
3050
Abstract :
A proton beam with the basic structure defined by the LHC requirements was first available for injection into the SPS in 1998. At the end of 2002, following a significant beam-studies and RF hardware upgrade programme, a beam having both the nominal LHC intensity and the correct longitudinal parameters was obtained at top energy for the first time. This beam, characterized by high local density, must satisfy strict requirements on bunch length, longitudinal emittance and bunch to bunch phase modulation for extraction to the LHC, where only very limited particle losses are acceptable. The problems to be solved came mainly from the high beam loading and microwave and coupled bunch instabilities which led both to beam losses and to unacceptably large longitudinal emittance on the flat top. In this paper the steps taken to arrive at these nominal beam parameters are presented.
Keywords :
accelerator RF systems; particle beam bunching; particle beam dynamics; particle beam extraction; particle beam injection; particle beam stability; phase modulation; proton accelerators; proton beams; storage rings; synchrotrons; CERN SPS; LHC beam; RF hardware upgrade programme; bunch length; coupled bunch instabilities; high local density beam; longitudinal emittance; nominal LHC intensity; nominal beam parameters; particle losses; phase modulation; proton beam; Energy capture; Frequency estimation; Hardware; Impedance measurement; Large Hadron Collider; Optical coupling; Particle beams; Phase modulation; Radio frequency; Stability;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
ISSN :
1063-3928
Print_ISBN :
0-7803-7738-9
Type :
conf
DOI :
10.1109/PAC.2003.1289810
Filename :
1289810
Link To Document :
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