Author: Arduini, G.
Paper Title Page
MOPOR008 Beam Induced RF Heating in LHC in 2015 602
  • B. Salvant, O. Aberle, M. Albert, R. Alemany-Fernandez, G. Arduini, J. Baechler, M.J. Barnes, P. Baudrenghien, O.E. Berrig, N. Biancacci, G. Bregliozzi, J.V. Campelo, F. Carra, F. Caspers, P. Chiggiato, A. Danisi, H.A. Day, M. Deile, D. Druzhkin, J.F. Esteban Müller, S. Jakobsen, J. Kuczerowski, A. Lechner, R. Losito, A. Masi, N. Minafra, E. Métral, A.A. Nosych, A. Perillo Marcone, D. Perini, S. Redaelli, F. Roncarolo, G. Rumolo, E.N. Shaposhnikova, J.A. Uythoven, C. Vollinger, A.J. Välimaa, N. Wang, M. Wendt, J. Wenninger, C. Zannini
    CERN, Geneva, Switzerland
  • M. Bozzo
    INFN Genova, Genova, Italy
  • J.F. Esteban Müller
    EPFL, Lausanne, Switzerland
  • N. Wang
    IHEP, Beijing, People's Republic of China
  Following the recurrent beam induced RF issues that perturbed LHC operation during LHC Run 1, a series of actions were put in place to minimize the risk that similar issues would occur in LHC Run 2: longitudinal impedance reduction campaign and/or improvement of cooling for equipment that were problematic or at the limit during Run 1, stringent constraints enforced on new equipment that would be installed in the machine, tests to control the bunch length and longitudinal distribution, additional monitoring of temperature, new monitoring tools and warning chains. This contribution reports the outcome of these actions, both successes as well as shortcomings, and details the lessons learnt for the future runs.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR008  
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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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TUPOR017 Beam-beam Simulation of Crab Cavity with Frequence Dependent Noise for LHC Upgrade 1691
  • J. Qiang
    LBNL, Berkeley, California, USA
  • G. Arduini, Y. Papaphilippou, T. Pieloni
    CERN, Geneva, Switzerland
  • J. Barranco
    EPFL, Lausanne, Switzerland
  High luminosity LHC upgrade will improve the luminosity of the current LHC operation by an order of magnitude. Crab cavity as a critical component for compensating luminosity loss from large crossing angle collision and also providing luminosity leveling for the LHC upgrade is being actively pursued. In this paper, we will report on the study of potential effects of the frequence-dependent crab cavity noise on the beam luminosity lifetime using strong-strong beam-beam simulations.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR017  
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