Author: Papadopoulou, S.
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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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TUPMW022 Modelling and Measurements of Bunch Profiles at the LHC Flat Bottom 1477
SUPSS004   use link to see paper's listing under its alternate paper code  
  • S. Papadopoulou, F. Antoniou, J.E. Muller, Y. Papaphilippou, G. Trad
    CERN, Geneva, Switzerland
  At the LHC flat bottom the interplay between a series of effects (i.e. intrabeam scattering, longitudinal beam manipulations, non-linearities of the machine, etc) can lead to a population of the tails of the beam distributions, which may become non-Gaussian. This paper presents observations of the evolution of particle distributions in the LHC flat bottom. Novel distribution functions are employed to represent the beam profiles, and used as a guideline for generalising emittance growth rate estimations due to IBS. Finally, an attempt is made to benchmark an IBS Monte-Carlo simulation code, able to track 3D particle distributions, with the measured beam profile evolutions.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW022  
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  • H. Ghasem, J. Alabau-Gonzalvo, F. Antoniou, S. Papadopoulou, Y. Papaphilippou
    CERN, Geneva, Switzerland
  The new design of CLIC damping rings is based on longitudinal variable bends and high field superconducting wiggler magnets. It provides an ultra-low horizontal normalised emittance of 412 nm-rad at 2.86 GeV. In this paper, nonlinear beam dynamics of the new design of the damping ring (DR) with trapezium field profile bending magnets have been investigated in detail. Effects of the misalignment errors have been studied in the closed orbit and dynamic aperture.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW003  
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