Author: Sublet, A.
Paper Title Page
TUXAA02 HIE Isolde Cavity Production & Cryomodule Commissioning, Lessons Learned 338
 
  • W. Venturini Delsolaro, K. Artoos, O. Brunner, O. Capatina, K.M. Dr. Schirm, Y. Kadi, Y. Leclercq, A. Miyazaki, E. Montesinos, V. Parma, G.J. Rosaz, A. Sublet, S. Teixeira Lopez, M. Therasse, L.R. Williams
    CERN, Geneva, Switzerland
  
  The lessons learned during the HIE Isolde Cavity Production, the Cryo Module Assembly and Commissioning will be presented  
slides icon Slides TUXAA02 [8.191 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUXAA02  
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TUPB078 SUBU Characterisation: Bath Fluid Dynamics vs Etching Rate 575
 
  • A. Perez Rodriguez, L.M.A. Ferreira, A. Sublet
    CERN, Geneva, Switzerland
  
  The chemical polishing bath SUBU is widely used at CERN to prepare copper RF cavities surfaces before niobium thin film coating; examples are HIE-ISOLDE, LHC and future FCC accelerating cavities. The performance of the polishing process is affected by bath temperature and fluid dynamics. As part of on-going activities to characterise SUBU, the actual study was done to identify a correlation between the etching rate and physical parameters linked to the bath fluid dynamics. A first approach was made using experimental data from a simplified model setup, transposing them via numerical simulation to a real cavity geometry and verifying the agreement with an experiment in a real size (HIE-ISOLDE) mock-up. In a second approach to improve the accuracy of the calculation, the relation of the measured local etching rates, extracted from the mock-up, to flow dynamics quantities extracted from simulation was investigated. As a result, a correlation between the local etching rate and the turbulence kinetic energy was obtained. This correlation can be exploited to improve the polishing tools and so optimise the current process, as well as to predict the etching rate in other cavity geometries.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB078  
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WEXA04
 SRF Cavity Coatings: Review of Alternative Materials and Coating Techniques  
 
  • G.J. Rosaz, S. Aull, E.A. Ilyina, A. Sublet, W. Venturini Delsolaro
    CERN, Geneva, Switzerland
  
  R/D is ongoing at CERN to study A15 coatings on copper substrates for applications on SRF cavities, in particular for future large accelerators like the FCC. The presentation will give an overview of the techniques and of the main results achieved so far  
slides icon Slides WEXA04 [33.223 MB]  
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WEYA03 A Seamless Quarter-wave Resonator for HIE-ISOLDE 686
 
  • S. Teixeira Lopez, M.A. Fraser, M. Garlaschè, T. Mikkola, A. Miyazaki, A. Sublet, W. Venturini Delsolaro
    CERN, Geneva, Switzerland
  
  The superconducting linac booster for the HIE ISOLDE project, in operation at CERN, is based on NB/Cu coated Quarter Wave Resonators. The performance of the series cavities has been limited by defects in the copper substrates close to the EB weld. A novel cavity design has been developed and prototyped, in order to make it possible manufacturing of the resonators by machining them from the bulk, without any weld. The RF design was optimized for the customary figures of merit, and fully integrated in the HIE ISOLDE cryomodule. Mechanical tolerances were assessed in relation to the available range of pre tuning, and demonstrated on a dummy prototype. Beam dynamics simulations were carried out to check the effects on the beams when the new cavities will be installed in the high energy end of the linac. The presentation will cover the design and the first experimental results of the first Nb/Cu seamless QWR for HIE ISOLDE.  
slides icon Slides WEYA03 [5.262 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-WEYA03  
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THPB048 Double Cathode Configuration for the Nb Coating of HIE-ISOLDE Cavities 854
 
  • A. Awais
    NCP, Islamabad, Pakistan
  • A. Awais, A.J.G. Lunt, G.J. Rosaz, A. Sublet, M. Taborelli
    CERN, Geneva, Switzerland
  
  The Quarter Wave Resonator (QWR) cavities for HIE-ISOLDE project at CERN have entered their ending phase of production. Some R&D is still required to improve the uniformity of the Nb layer thickness on the cavity surface. In order to improve this behaviour one approach which has been proposed is to replace the single cathode with a double cathode and test the suitability of different deposition techniques. With this change it is possible to control the plasma and power distribution separately for the inner and outer part of cavity and thereby potentially improve film uniformity throughout the cavity and coating duration. In this study a comparison between the deposition rates obtained using a single cathode and a double cathode using Direct Current (DC)-bias diode sputtering, DC-magnetron sputtering (DCMS) and Pulsed DC-magnetron sputtering (PDCMS) is presented. The morphology of the thin film samples were compared using Focused Ion Beam (FIB) cross section milling and Scanning Electron Microscopy (SEM) analysis.  
poster icon Poster THPB048 [3.715 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB048  
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