Keyword: luminosity
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THAA01 Recent Developments in Superconducting Deflecting-Mode Cavities cavity, dipole, HOM, simulation 987
 
  • J.R. Delayen
    ODU, Norfolk, Virginia, USA
 
  In the last few years there has been a growing interest in compact superconducting cavities operating in a deflecting mode to be used either in rf separators or crabbing systems. This talk will give an overview of recent progress in global activities towards SRF deflecting mode cavities.  
slides icon Slides THAA01 [4.729 MB]  
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THPB019 Bead-Pull Measurements of the Main Deflecting Mode of the Double-Quarter-Wave Cavity for the HL-LHC cavity, simulation, resonance, factory 1105
 
  • M. Navarro-Tapia, R. Calaga
    CERN, Geneva, Switzerland
 
  Funding: This research has received funding from the European Commission under the FP7 project HiLumi LHC (Grant agreement no. 284404), and under a Marie Curie action (Grant agreement PCOFUND-GA-2010-267194).
A full-scale model of the double-quarter-wave (DQW) cavity towards the High-Luminosity Large Hadron Collider (HL-LHC) upgrade was built in aluminum to characterize the deflecting mode. Field strength measurements have been carried out for both the transverse and longitudinal electromagnetic fields, by using the bead-pull technique. Perturbation objects of different shapes and material were used to separate the electric and magnetic field components. A reasonably good agreement was found between numerical simulation and measurements, which confirm the reliability and accuracy of the measurements done.
 
poster icon Poster THPB019 [0.237 MB]  
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THPB053 Electromagnetic Design of 400 MHz RF-Dipole Crabbing Cavity for LHC High Luminosity Upgrade cavity, HOM, dipole, impedance 1222
 
  • S.U. De Silva, J.R. Delayen, H. Park
    ODU, Norfolk, Virginia, USA
  • Z. Li
    SLAC, Menlo Park, California, USA
 
  The beam crabbing proposed for the LHC High Luminosity Upgrade requires two crabbing systems operating in both horizontal and vertical planes. In addition, the crabbing cavity design needs to meet strict dimensional constraints and functional specifications of the cavities. This paper presents the detailed electromagnetic design including em properties, multipole analysis, multipacting levels of the 400 MHz rf-dipole crabbing cavity.  
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THPB069 Engineering Design and Prototype Fabrication of HOM Couplers for HL-LHC Crab Cavities HOM, niobium, cavity, SRF 1279
 
  • C. Zanoni, S. Atieh, I. Aviles Santillana, R. Calaga, O. Capatina, T. Capelli, F. Carra, P. Freijedo Menendez, M. Garlaschè, J.-M. Geisser, R. Leuxe, L. Marques Antunes Ferreira, E. Rigutto
    CERN, Geneva, Switzerland
  • S.A. Belomestnykh, S. Verdú-Andrés, Q. Wu, B. P. Xiao
    BNL, Upton, Long Island, New York, USA
  • G. Burt
    Lancaster University, Lancaster, United Kingdom
  • S.U. De Silva, J.R. Delayen, R.G. Olave, H. Park
    ODU, Norfolk, Virginia, USA
  • T.J. Jones, N. Templeton
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • Z. Li
    SLAC, Menlo Park, California, USA
  • A.J. May, S.M. Pattalwar
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • T.H. Nicol
    Fermilab, Batavia, Illinois, USA
  • A. Ratti
    LBNL, Berkeley, California, USA
 
  The High-Luminosity upgrade for the LHC relies on a set of RF Crab Cavities for reaching its goals. Two parallel concepts, the Double Quarter Wave (DQW) and the RF Dipole (RFD), are going through a comprehensive design process along with preparation of fabrication in view of extensive tests with beam in SPS. High Order Modes (HOM) couplers are critical in providing damping in RF cavities for operation in accelerators. HOM prototyping and fabrication have recently started at CERN. In this paper, an overview of the final shape is provided along with an insight in the mechanical and thermal analyses performed to validate the design of these critical components. Emphasis is also given to test campaigns, material selection, prototyping and initial fabrication that are aimed at fulfilling the highly demanding tolerances of the couplers.  
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