Beam losses from ultra-peripheral nuclear collisions between 208Pb82+ ions in the Large Hadron Collider and their alleviation

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Electromagnetic interactions between colliding heavy ions at the Large Hadron Collider (LHC) at CERN will give rise to localized beam losses that may quench superconducting magnets, apart from contributing significantly to the luminosity decay. To quantify their impact on the operation of the collider, we have used a three-step simulation approach, which consists of optical tracking, a Monte-Carlo shower simulation and a thermal network model of the heat flow inside a magnet. We present simulation results for the case of {sup 208}Pb{sup 82+} ion operation in the LHC, with focus on the ALICE interaction region, and show that the expected ... continued below

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17 pages

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Bruce, R.; Gildardoni, S.; Jowett, J.M.; /CERN; Bocian, D. & /Fermilab July 1, 2009.

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Electromagnetic interactions between colliding heavy ions at the Large Hadron Collider (LHC) at CERN will give rise to localized beam losses that may quench superconducting magnets, apart from contributing significantly to the luminosity decay. To quantify their impact on the operation of the collider, we have used a three-step simulation approach, which consists of optical tracking, a Monte-Carlo shower simulation and a thermal network model of the heat flow inside a magnet. We present simulation results for the case of {sup 208}Pb{sup 82+} ion operation in the LHC, with focus on the ALICE interaction region, and show that the expected heat load during nominal {sup 208}Pb{sup 82+} operation is 40% above the quench level. This limits the maximum achievable luminosity. Furthermore, we discuss methods of monitoring the losses and possible ways to alleviate their effect.

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17 pages

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  • Journal Name: Submitted to Phys.Rev.ST Accel.Beams

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  • Report No.: FERMILAB-PUB-09-367-TD
  • Grant Number: AC02-07CH11359
  • DOI: 10.1103/PhysRevSTAB.12.071002 | External Link
  • Office of Scientific & Technical Information Report Number: 962751
  • Archival Resource Key: ark:/67531/metadc930938

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  • July 1, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 6, 2016, 7:31 p.m.

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Bruce, R.; Gildardoni, S.; Jowett, J.M.; /CERN; Bocian, D. & /Fermilab. Beam losses from ultra-peripheral nuclear collisions between 208Pb82+ ions in the Large Hadron Collider and their alleviation, article, July 1, 2009; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc930938/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.