Effect of the beam-beam interactions on the dynamic aperture and amplitude growth in the LHC

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The dynamic aperture at collision energy is determined pri-marily by the nonlinear fields of the IR quadrupoles but is also influenced by the beam-beam interactions. We revisit the choice of the crossing angle that maximizes the dynamic aperture with an accurate modeling of the long-range inter-actions and use of the present values of the IR quadrupole field harmonics. A separate but related issue we address is the amplitude growth of particles in the beam halo due to the long-range interactions.

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Johnstone, C.; Wan, W.; Gelfand, N. & Sen, T. June 17, 1999.

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The dynamic aperture at collision energy is determined pri-marily by the nonlinear fields of the IR quadrupoles but is also influenced by the beam-beam interactions. We revisit the choice of the crossing angle that maximizes the dynamic aperture with an accurate modeling of the long-range inter-actions and use of the present values of the IR quadrupole field harmonics. A separate but related issue we address is the amplitude growth of particles in the beam halo due to the long-range interactions.

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147 Kilobytes

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  • Workshop on Beam-beam Effects in Large Hadron Colliders, CERN, Geneva, Switzerland, April 12-16, 1999

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  • Other: DE00007832
  • Report No.: FERMILAB-Conf-99/148
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 7832
  • Archival Resource Key: ark:/67531/metadc718355

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  • June 17, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 18, 2016, 2:36 p.m.

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Johnstone, C.; Wan, W.; Gelfand, N. & Sen, T. Effect of the beam-beam interactions on the dynamic aperture and amplitude growth in the LHC, article, June 17, 1999; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc718355/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.