First observations of beam losses due to bound-free pairproduction in a heavy-ion collider

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We report the first observations of beam losses due tobound-free pair production at the interaction point of a heavy-ioncollider. This process is expected to be a major luminosity limit for theLarge Hadron Collider (LHC) when it operates with 208Pb82+ ions becausethe localized energy deposition by the lost ions may quenchsuperconducting magnet coils. Measurements were performed at theRelativistic Heavy Ion Collider (RHIC) during operation with 100GeV/nucleon 63Cu29+ ions. At RHIC, the rate, energy and magnetic fieldare low enough so that magnet quenching is not an issue. The hadronicshowers produced when the single-electron ions struck the RHIC beampipewere observed using an array ... continued below

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Bruce, R.; Jowett, J.M.; Gilardoni, S.; Drees, A.; Fischer, W.; Tepikian, S. et al. June 15, 2007.

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We report the first observations of beam losses due tobound-free pair production at the interaction point of a heavy-ioncollider. This process is expected to be a major luminosity limit for theLarge Hadron Collider (LHC) when it operates with 208Pb82+ ions becausethe localized energy deposition by the lost ions may quenchsuperconducting magnet coils. Measurements were performed at theRelativistic Heavy Ion Collider (RHIC) during operation with 100GeV/nucleon 63Cu29+ ions. At RHIC, the rate, energy and magnetic fieldare low enough so that magnet quenching is not an issue. The hadronicshowers produced when the single-electron ions struck the RHIC beampipewere observed using an array of photodiodes. The measurement confirms theorder of magnitude of the theoretical cross section previously calculatedby others.

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  • Journal Name: Physical Review Letters; Journal Volume: 99; Related Information: Journal Publication Date: 2007

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  • Report No.: LBNL--63211
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1103/PhysRevLett.99.144801 | External Link
  • Office of Scientific & Technical Information Report Number: 932490
  • Archival Resource Key: ark:/67531/metadc901310

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 15, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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Bruce, R.; Jowett, J.M.; Gilardoni, S.; Drees, A.; Fischer, W.; Tepikian, S. et al. First observations of beam losses due to bound-free pairproduction in a heavy-ion collider, article, June 15, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc901310/: accessed November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.