New approach to LHC optics commissioning for the nonlinear era
In 2017, optics commissioning strategy for low-β^{*} operation of the CERN Large Hadron Collider (LHC) underwent a major revision. This was prompted by a need to extend the scope of beam-based commissioning at high energy, beyond the exclusively linear realm considered previously, and into the nonli...
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2019-06-01
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Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.22.061004 |
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doaj-8f493f60e0f940318951231e8387a8b92020-11-25T02:40:48ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882019-06-0122606100410.1103/PhysRevAccelBeams.22.061004New approach to LHC optics commissioning for the nonlinear eraE. H. MacleanR. TomásF. S. CarlierM. S. CamillocciJ. W. DillyJ. Coello de PortugalE. FolK. FuchsbergerA. Garcia-Tabares ValdiviesoM. GiovannozziM. HoferL. MalinaT. H. B. PerssonP. K. SkowronskiA. WegscheiderIn 2017, optics commissioning strategy for low-β^{*} operation of the CERN Large Hadron Collider (LHC) underwent a major revision. This was prompted by a need to extend the scope of beam-based commissioning at high energy, beyond the exclusively linear realm considered previously, and into the nonlinear regime. It also stemmed from a recognition that, due to operation with crossing angles in the experimental insertions, the linear and nonlinear optics quality were intrinsically linked through potentially significant feed-down at these locations. Following the usual linear optics commissioning therefore, corrections for (normal and skew) sextupole and (normal and skew) octupole errors in the high-luminosity insertions were implemented. For the first time, the LHC now operates at top energy with beam-based corrections for nonlinear dynamics, and for the effect of the crossing scheme on beta-beating and dispersion. The new commissioning procedure has improved the control of various linear and nonlinear characteristics of the LHC, yielding clear operational benefits.http://doi.org/10.1103/PhysRevAccelBeams.22.061004 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
E. H. Maclean R. Tomás F. S. Carlier M. S. Camillocci J. W. Dilly J. Coello de Portugal E. Fol K. Fuchsberger A. Garcia-Tabares Valdivieso M. Giovannozzi M. Hofer L. Malina T. H. B. Persson P. K. Skowronski A. Wegscheider |
spellingShingle |
E. H. Maclean R. Tomás F. S. Carlier M. S. Camillocci J. W. Dilly J. Coello de Portugal E. Fol K. Fuchsberger A. Garcia-Tabares Valdivieso M. Giovannozzi M. Hofer L. Malina T. H. B. Persson P. K. Skowronski A. Wegscheider New approach to LHC optics commissioning for the nonlinear era Physical Review Accelerators and Beams |
author_facet |
E. H. Maclean R. Tomás F. S. Carlier M. S. Camillocci J. W. Dilly J. Coello de Portugal E. Fol K. Fuchsberger A. Garcia-Tabares Valdivieso M. Giovannozzi M. Hofer L. Malina T. H. B. Persson P. K. Skowronski A. Wegscheider |
author_sort |
E. H. Maclean |
title |
New approach to LHC optics commissioning for the nonlinear era |
title_short |
New approach to LHC optics commissioning for the nonlinear era |
title_full |
New approach to LHC optics commissioning for the nonlinear era |
title_fullStr |
New approach to LHC optics commissioning for the nonlinear era |
title_full_unstemmed |
New approach to LHC optics commissioning for the nonlinear era |
title_sort |
new approach to lhc optics commissioning for the nonlinear era |
publisher |
American Physical Society |
series |
Physical Review Accelerators and Beams |
issn |
2469-9888 |
publishDate |
2019-06-01 |
description |
In 2017, optics commissioning strategy for low-β^{*} operation of the CERN Large Hadron Collider (LHC) underwent a major revision. This was prompted by a need to extend the scope of beam-based commissioning at high energy, beyond the exclusively linear realm considered previously, and into the nonlinear regime. It also stemmed from a recognition that, due to operation with crossing angles in the experimental insertions, the linear and nonlinear optics quality were intrinsically linked through potentially significant feed-down at these locations. Following the usual linear optics commissioning therefore, corrections for (normal and skew) sextupole and (normal and skew) octupole errors in the high-luminosity insertions were implemented. For the first time, the LHC now operates at top energy with beam-based corrections for nonlinear dynamics, and for the effect of the crossing scheme on beta-beating and dispersion. The new commissioning procedure has improved the control of various linear and nonlinear characteristics of the LHC, yielding clear operational benefits. |
url |
http://doi.org/10.1103/PhysRevAccelBeams.22.061004 |
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