Keyword: dipole
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SUPFDV007 Magnetic Field Penetration of Niobium Thin Films Produced by the ARIES Collaboration cavity, site, SRF, controls 77
 
  • D.A. Turner
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • G. Burt, K.D. Dumbell, O.B. Malyshev, R. Valizadeh
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • G. Burt
    Lancaster University, Lancaster, United Kingdom
  • E. Chyhyrynets, C. Pira
    INFN/LNL, Legnaro (PD), Italy
  • T. Junginger
    TRIUMF, Vancouver, Canada
  • T. Junginger
    UVIC, Victoria, Canada
  • S.B. Leith, M. Vogel
    University Siegen, Siegen, Germany
  • O.B. Malyshev, R. Valizadeh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A. Medvids
    Riga Technical University, Riga, Latvia
  • R. Ries
    Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava, Slovak Republic
  • E. Seiler
    IEE, Bratislava, Slovak Republic
  • A. Sublet
    CERN, Meyrin, Switzerland
  • J.T.G. Wilson
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
 
  Superconducting (SC) thin film coatings on Cu substrates are already widely used as an alternative to bulk Nb SRF structures. Using Cu allows improved thermal stability compared to Nb due to having a greater thermal conductivity. Niobium thin film coatings also reduce the amount of Nb required to produce a cavity. The performance of thin film Nb cavities is not as good as bulk Nb cavities. The H2020 ARIES WP15 collaboration studied the impact of substrate polishing and the effect produced on Nb thin film depositions. Multiple samples were produced from Cu and polished with various techniques. The polished Cu substrates were then coated with a Nb film at partner institutions. These samples were characterised with surface characterisation techniques for film morphology and structure. The SC properties were studied with 2 DC techniques, a vibrating sample magnetometer (VSM) and a magnetic field penetration (MFP) facility. The results conclude that both chemical polishing and electropolishing produce the best DC properties in the MFP facility. A comparison between the VSM and the MFP facility can be made for 10 micron thick samples, but not for 3 micron thick samples.  
poster icon Poster SUPFDV007 [1.059 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-SUPFDV007  
About • Received ※ 21 June 2021 — Accepted ※ 28 October 2021 — Issue date; ※ 09 April 2022  
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MOPFAV004 First Vertical Test of a Prototype Crab Cavity for HL-LHC at FREIA Laboratory in Uppsala University cavity, experiment, SRF, MMI 313
 
  • A. Miyazaki, K. Fransson, K.J. Gajewski, L. Hermansson, R.J.M.Y. Ruber
    Uppsala University, Uppsala, Sweden
 
  We developed and commissioned a new vertical test stand at FREIA Laboratory for the High-Lumi LHC project. The first cold test was performed with a prototype crab cavity (Double-Quarter-Wave cavity) and the obtained result met the project specification. This opened a new opportunity at Uppsala University for SRF science and engineering. In this poster, the result of the first cold test and plans for future experiments are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-MOPFAV004  
About • Received ※ 21 June 2021 — Revised ※ 14 August 2021 — Accepted ※ 21 August 2021 — Issue date ※ 07 October 2021
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TUPCAV004 Deflecting Cavities for Proton Beam Spreader in CiADS Project cavity, proton, superconducting-RF, linac 445
 
  • Y.L. Huang, Y. He, H. Jia, Y.S. Qin, Z.J. Wang, Z.L. Zhang
    IMP/CAS, Lanzhou, People’s Republic of China
 
  Funding: Large Research Infrastructures "China initiative Accelerator Driven System’(Grant No.2017-000052-75-01-000590 ) and National Natural Science Foundation of China (Grant NO. 11805249)
Chinese initiative Accelerator Driven Subcritical System (CiADS) is supposed to accelerate continuous 162.5 MHz, 10 mA (or higher) proton beam to 500 MeV (or higher energy) with a superconducting driver linac. More application scenarios based on this high power intensity proton linac are now under considerations. Beam spreader system based on deflecting cavities for multiple users simultaneous operation are discussed in this paper, as well as the RF structure options for the equal eight- and nigh- beam-line split schemes.
#huangyulu@impcas.ac.cn
 
poster icon Poster TUPCAV004 [1.074 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-TUPCAV004  
About • Received ※ 21 June 2021 — Revised ※ 16 August 2021 — Accepted ※ 23 August 2021 — Issue date ※ 13 May 2022
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WEOCAV03 RF Dipole Crab Cavity Testing for HL-LHC cavity, HOM, controls, operation 687
 
  • N. Valverde Alonso, R. Calaga, S.J. Calvo, O. Capatina, O. Capatina, A. Castilla, M. Chiodini, C. Duval, L.M.A. Ferreira, M. Gourragne, P.J. Kohler, T. Mikkola, J.A. Mitchell, E. Montesinos, C. Pasquino, G. Pechaud, N. Stapley, M. Therasse, K. Turaj, J.D. Walker
    CERN, Geneva 23, Switzerland
  • A. Castilla
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • A. Castilla
    Lancaster University, Lancaster, United Kingdom
 
  RF Crab Cavities are an essential element of the High Luminosity LHC (HL-LHC) upgrade at CERN. Two RF dipole crab cavity used for the compensation of the horizontal crossing angle were recently manufactured and integrated into Titanium Helium tank and RF ancillaries necessary for the beam operation. The two cavities will be integrated into a cryomodule in collaboration with UK-STFC and tested with proton beams in the SPS in 2023. This paper will highlight the RF measurements during the important manufacturing steps, surface preparation and cavity performance at 2K.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-WEOCAV03  
About • Received ※ 18 June 2021 — Revised ※ 07 September 2021 — Accepted ※ 16 September 2021 — Issue date ※ 22 November 2021
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