Author: Papaphilippou, Y.
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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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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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WEPMW002 A CLIC Damping Wiggler Prototype at ANKA: Commissioning and Preparations for a Beam Dynamics Experimental Program 2412
  • A. Bernhard, S. Casalbuoni, S. Gerstl, J. Gethmann, A.W. Grau, E. Huttel, A.-S. Müller, D. Saez de Jauregui, N.J. Smale
    KIT, Eggenstein-Leopoldshafen, Germany
  • A.V. Bragin, S.V. Khrushchev, N.A. Mezentsev, V.A. Shkaruba, V.M. Tsukanov, K. Zolotarev
    BINP SB RAS, Novosibirsk, Russia
  • P. Ferracin, L. Garcia Fajardo, Y. Papaphilippou, H. Schmickler, D. Schoerling, P. Zisopoulos
    CERN, Geneva, Switzerland
  Funding: This work is partially funded by the German Federal Ministry of Education and Research under grant 05K12VK1
In a collaboration between CERN, BINP and KIT a prototype of a superconducting damping wiggler for the CLIC damping rings has been installed at the ANKA synchrotron light source. On the one hand, the foreseen experimental program aims at validating the technical design of the wiggler, particularly the conduction cooling concept applied in its cryostat design, in a long-term study. On the other hand, the wiggler's influence on the beam dynamics particularly in the presence of collective effects is planned to be investigated. ANKA's low-alpha short-bunch operation mode will serve as a model system for these studies on collective effects. To simulate these effects and to make verifiable predictions an accurate model of the ANKA storage ring in low-alpha mode, including the insertion devices is under parallel development. This contribution reports on the first operational experience with the CLIC damping wiggler prototype in the ANKA storage ring and steps towards the planned advanced experimental program with this device.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW002  
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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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THPMR041 Implementation of High Order Symplectic Integrators with Positive Steps in Tracking Programs 3484
  • K. Skoufaris, Y. Papaphilippou
    CERN, Geneva, Switzerland
  • J. Laskar
    IMCCE, Paris, France
  • Ch. Skokos
    University of Cape Town, Cape Town, South Africa
  The symplectic integrators CSABAν & CSBABν are used in order to calculate single particles dynamics in accelerators and storage rings. These integrators present only positive steps and can be accurate up to the high order. They are compared with already existing splitting methods of MAD-X with respect to their impact on various beam dynamics quantities, for different beam elements.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR041  
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THPMR042 Design Guidelines for the Injector Complex of the FCC-ee 3488
  • Y. Papaphilippou, F. Zimmermann
    CERN, Geneva, Switzerland
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • K. Oide
    KEK, Ibaraki, Japan
  • L. Rinolfi
    JUAS, Archamps, France
  • D.B. Shwartz
    BINP SB RAS, Novosibirsk, Russia
  The design of the injector of the FCC-ee, a high-luminosity e+/e circular collider of 100 km in the Geneva area, is driven by the required particle flux for ring filling or top-up and for a variety of energies, from 45.5 to 175 GeV. In this paper, a set of parameters of the injector complex is presented, fulfilling the collider needs for all running scenarios. In particular, the challenges of the booster ring design are detailed, focusing on issues of optics, layout, low bending fields, injection schemes to the collider for maximizing transfer efficiency and synchrotron radiation handling.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR042  
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THPOR022 Design of Beam Optics for the FCC-ee Collider Ring 3821
  • K. Oide, K. Ohmi, D. Zhou
    KEK, Ibaraki, Japan
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • S. Aumon, M. Benedikt, H. Burkhardt, A. Doblhammer, B. Härer, B.J. Holzer, J.M. Jowett, M. Koratzinos, L.E. Medina Medrano, Y. Papaphilippou, J. Wenninger, F. Zimmermann
    CERN, Geneva, Switzerland
  • A.P. Blondel
    DPNC, Genève, Switzerland
  • A.V. Bogomyagkov, I. Koop, E.B. Levichev, P.A. Piminov, D.N. Shatilov, D.B. Shwartz, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  • M. Boscolo
    INFN/LNF, Frascati (Roma), Italy
  • Y. Cai, M.K. Sullivan, U. Wienands
    SLAC, Menlo Park, California, USA
  A design of beam optics will be presented for the FCC-ee double-ring collider. The main characteristics are 45 to 175 GeV beam energy, 100 km circumference with two IPs/ring, 30 mrad crossing angle at the IP, crab-waist scheme with local chromaticity correction system, and "tapering" of the magnets along with the local beam energy. An asymmetric layout near the interaction region suppresses the critical energy of synchrotron radiation toward the detector at the IP less than 100 keV, while keeping the geometry as close as to the FCC-hh beam line. A sufficient transverse/longitudinal dynamic aperture is obtained to assure the lifetime with beamstrahlung and top-up injection. The synchrotron radiation in all magnets, the IP solenoid and its compensation, nonlinearity of the final quadrupoles are taken into account.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR022  
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