Author: Hernández-Chahín, K.G.
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MOPB074 CERN’s Bulk Niobium High Gradient SRF Programme: Developments and Recent Cold Test Results 291
 
  • A. Macpherson, K.G. Hernández-Chahín, C. Jarrige, P. Maesen, F. Pillon, K.M. Schirm, R. Torres-Sanchez, N. Valverde Alonso
    CERN, Geneva, Switzerland
  • K.G. Hernández-Chahín
    DCI-UG, León, Mexico
  
  Recent results from the bulk niobium high-gradient cavity development program at CERN are presented, with particular focus on test results for the 704 MHz bulk niobium 5-cell elliptical cavity prototypes produced for the Superconducting Proton Linac (SPL) project. Successive cold tests of bare cavities have been used to refine the cavity preparation and testing process, with all steps done in-house at CERN. Current performance results are discussed with reference to observables such as ambient magnetic field, field emission levels, and quenches.  
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TUPB080 Diagnostic Developments at CERN’s SRF Testing Facility 778
 
  • A. Macpherson, S. Aull, A. Benoit, P.F. Fernández López, K.G. Hernández-Chahín, C. Jarrige, P. Maesen, K.M. Schirm, R. Torres-Sanchez, R. Valera Teruel
    CERN, Geneva, Switzerland
  • K.G. Hernández-Chahín
    DCI-UG, León, Mexico
  • T. Junginger
    HZB, Berlin, Germany
  • T. Junginger
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  
  As part of CERN’s re-establishment of an SRF cold testing facility for bulk niobium cavities, diagnostic instrumentation and testing procedures on our vertical cryostat have been upgraded, with particular attention given to quench location, ambient magnetic field control, thermometry and thermal cycling techniques. In addition, preparation and measurement procedures have been addressed, allowing for improved measurement of cavity properties and detailed study of transient effects during the course of cavity testing.  
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THPB050 Performance Evaluation of HL-LHC Crab Cavity Prototypes in a CERN Vertical Test Cryostat 1210
 
  • K.G. Hernández-Chahín
    DCI-UG, León, Mexico
  • G. Burt
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C. Christophe, A. Macpherson, M. Navarro-Tapia, R. Torres-Sanchez
    CERN, Geneva, Switzerland
  • S.U. De Silva
    ODU, Norfolk, Virginia, USA
  • A.R.J. Tutte
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • S. Verdú-Andrés
    BNL, Upton, Long Island, New York, USA
  
  Funding: My work is supported by the Mexican CONACYT(Consejo Nacional de Ciencia y Tecnologia) program through the Mexican national scholarship (Becas Nacionales y Becas Mixtas).
Three proof-of-principle compact crab cavity designs have been fabricated in bulk niobium and cold tested at their home labs, as a first validation step towards the High Luminosity LHC project. As a cross check, all three bare cavities have been retested at CERN, in order to cross check their performance, and cross-calibrate the CERN SRF cold test facilities. While achievable transverse deflecting voltage is the key performance indicator, secondary performance aspects derived from multiple cavity monitoring systems are also discussed. Temperature mapping profiles, quench detection, material properties, and trapped magnetic flux effects have been assessed, and the influence on performance discussed. The significant effort invested in developing expertise in preparation and testing of these crab cavities has already been fruitful for all partners, and more is to come within this ongoing program. 		 
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