Title :
Compensation of linear lattice imperfections in the Large Hadron Collider
Author :
Galluccio, F. ; Guo, Z. ; Risselada, T. ; Scandale, W. ; Schmidt, F.
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
Closed-orbit and linear coupling corrections have been studied for the LHC lattice, using different samples of the random error imperfections. Distortions in the closed-orbit are mainly due to alignment and field errors of the main magnets. The main source of the linear coupling is found to be the skew quadrupole component of the dipoles, with its random and systematic part. The linear imperfections expected in the LHC are large enough to prevent the confinement of the beam in the vacuum chamber. Beam position monitors and correction dipoles near each lattice quadrupole are able to reduce the RMS closed-orbit distortion to below 1 mm.<>
Keywords :
beam handling techniques; particle beam diagnostics; proton accelerators; storage rings; synchrotrons; LHC lattice; Large Hadron Collider; RMS closed-orbit distortion; alignment errors; beam position monitors; closed orbit corrections; correction dipoles; dipoles; field errors; lattice quadrupole; linear coupling corrections; linear lattice imperfections; main magnets; random error imperfections; skew quadrupole component; Apertures; Cleaning; Computational modeling; Computer simulation; Error correction; Large Hadron Collider; Lattices; Magnetic confinement; Magnets; Optical distortion;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164740
