Author: Hostettler, M.
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MOPMR025 Beam Size Estimation from Luminosity Scans at the LHC During 2015 Proton Physics Operation 290
  • M. Hostettler, G. Papotti
    CERN, Geneva, Switzerland
  • M. Hostettler
    LHEP, Bern, Switzerland
  As a complementary method for measuring the beam size for high-intensity beams at 6.5 TeV flat-top energy, beam separation scans were done regularly at the CERN Large Hadron Collider (LHC) during 2015 proton physics operation. The luminosities measured by the CMS experiment during the scans were used to derive the convoluted beam size and orbit offset bunch-by-bunch. This contribution will elaborate on the method used to derive plane-by-plane, bunch-by-bunch emittances from the scan data, including uncertainties and corrections. The measurements are then compared to beam size estimations from absolute luminosity, synchrotron light telescopes, and wire scanners. In particular, the evolution of the emittance over the course of several hours in collisions is studied and bunch-by-bunch differences are highlighted.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR025  
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TUPMW002 LHC Luminosity Modeling for RUNII 1403
  • F. Antoniou, G. Arduini, M. Hostettler, M. Lamont, S. Papadopoulou, Y. Papaphilippou, G. Papotti, M. Pojer, B. Salvachua, M. Wyszynski
    CERN, Geneva, Switzerland
  Funding: Research supported by the High Luminosity LHC project
After a long shut-down (LS1), LHC restarted its operation on April 2015 at a record energy of 6.5TeV, achieving soon a good luminosity performance. In this paper, a luminosity model based on the three main components of the LHC luminosity degradation (intrabeam scattering, synchrotron radiation and luminosity burn-off), is compared with data from runII. Based on the observations, other sources of luminosity degradation are discussed and the model is refined. Finally, based on the experience from runI and runII, the model is used for integrated luminosity projections for the HL-LHC beam parameters.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW002  
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