LHC luminosity upgrade with large Piwinski angle scheme: a recent look

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Luminosity upgrade at the LHC collider using longitudinally flat bunches in combination with the large crossing angle (large Piwinski angle scheme) is being studied with renewed interest in recent years. By design, the total beam-beam tune shift at the LHC is less than 0.015 for two interaction points together. But the 2010-11 3.5 TeV collider operation and dedicated studies indicated that the beam-beam tune shift is >0.015 per interaction point. In view of this development we have revisited the requirements for the Large Piwinski Angle scheme at the LHC. In this paper we present a new set of parameters and ... continued below

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3 pages

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Bhat, C.M.; /Fermilab; Zimmermann, f. & /CERN September 1, 2011.

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Luminosity upgrade at the LHC collider using longitudinally flat bunches in combination with the large crossing angle (large Piwinski angle scheme) is being studied with renewed interest in recent years. By design, the total beam-beam tune shift at the LHC is less than 0.015 for two interaction points together. But the 2010-11 3.5 TeV collider operation and dedicated studies indicated that the beam-beam tune shift is >0.015 per interaction point. In view of this development we have revisited the requirements for the Large Piwinski Angle scheme at the LHC. In this paper we present a new set of parameters and luminosity calculations for the desired upgrade by investigating: (1) current performance of the LHC injectors, (2) e-cloud issues on nearly flat bunches and (3) realistic beam particle distributions from longitudinal beam dynamics simulations. We also make some remarks on the needed upgrades on the LHC injector accelerators.

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3 pages

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  • Presented at 2nd International Particle Accelerator Conference: IPAC 2011, San Sebastian, Spain, 4-9 Sep 2011

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  • Report No.: FERMILAB-CONF-11-417-AD-APC
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 1030747
  • Archival Resource Key: ark:/67531/metadc840411

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 26, 2016, 6:08 p.m.

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Bhat, C.M.; /Fermilab; Zimmermann, f. & /CERN. LHC luminosity upgrade with large Piwinski angle scheme: a recent look, article, September 1, 2011; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc840411/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.