Emittance growth for the LHC beams due to head-on beam-beam interaction and ground motion

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The influence of ground motion on the LHC beam is estimated applying the existing theories of particle diffusion due to a weak-strong beam-beam collision with random offset at the interaction point. Noise at odd harmonics of the betatron frequency contributes significantly to particle diffusion. The spectrum of the random offset, as obtained from the ground motion spectrum at the LHC site, shows a fast fall-off with frequency and the amplitude is very small even at the first harmonic. They find that the head-on beam-beam force in the weak-strong approximation and ground motion by themselves do not induce significant diffusion over ... continued below

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716 Kilobytes pages

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Sen, Mari Paz Zorzano and Tanaji April 18, 2000.

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The influence of ground motion on the LHC beam is estimated applying the existing theories of particle diffusion due to a weak-strong beam-beam collision with random offset at the interaction point. Noise at odd harmonics of the betatron frequency contributes significantly to particle diffusion. The spectrum of the random offset, as obtained from the ground motion spectrum at the LHC site, shows a fast fall-off with frequency and the amplitude is very small even at the first harmonic. They find that the head-on beam-beam force in the weak-strong approximation and ground motion by themselves do not induce significant diffusion over the lifetime of the beam.

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716 Kilobytes pages

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  • Other Information: PBD: 18 Apr 2000

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  • Report No.: FERMILAB-TM-2106
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/753852 | External Link
  • Office of Scientific & Technical Information Report Number: 753852
  • Archival Resource Key: ark:/67531/metadc702725

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  • April 18, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 1, 2016, 6:48 p.m.

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Sen, Mari Paz Zorzano and Tanaji. Emittance growth for the LHC beams due to head-on beam-beam interaction and ground motion, report, April 18, 2000; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc702725/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.