Keyword: radio-frequency
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TU1AA06 Next-Generation Nb3Sn Superconducting RF Cavities cavity, SRF, accelerating-gradient, superconducting-RF 305
 
  • N.M. Verboncoeur, G. Gaitan, M. Liepe, R.D. Porter, L. Shpani, N.A. Stilin, Z. Sun
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
 
  Nb3Sn currently is the most promising alternative material for next-generation, higher-performance SRF cavities. Significant recent progress has been made in further increasing efficiency, maximum field, and demonstrating readiness for first applications in actual accelerators. This paper will present an overview of worldwide recent progress in making this material a viable option for further accelerators.  
slides icon Slides TU1AA06 [6.559 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU1AA06  
About • Received ※ 31 August 2022 — Revised ※ 01 September 2022 — Accepted ※ 04 September 2022 — Issue date ※ 09 September 2022
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TUPOPA10 Beam Dynamics and RF Design Studies for the New RFQ for CERN Linac4 Upgrade rfq, linac, emittance, quadrupole 430
 
  • H.W. Pommerenke, G. Bellodi, A. Grudiev, S. Kumar, A.M. Lombardi
    CERN, Meyrin, Switzerland
 
  The 352 MHz Linac4-RFQ is the first rf accelerating structure of the CERN accelerator complex, accelerating an H beam to 3 MeV. After successful commissioning in 2013, superficial vane damage has been observed in 2020. In view that the RFQ is a single point of failure, in parallel to the production of a near identical spare (RFQ2), design studies on a longer-term upgrade have been launched: Linac4-RFQ3. Main goals are to achieve a design with higher beam acceptance, reduced beam losses, and reduced RF breakdown rate. Two versions of RFQ are under study: a conventional RFQ built by brazing copper, as well as an RFQ with titanium vane tips (brazed on copper). High-gradient experiments suggest that titanium vane tips support higher surface fields compared to copper, up to 40 MV/m, and are more resistant against beam irradiation. In this paper, we present beam dynamics and rfdesign of both variants of RFQ3.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA10  
About • Received ※ 12 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 02 September 2022
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TUPOPA12 RF Measurements and Tuning of the Test Module of 800 MHz Radio-Frequency Quadrupole rfq, proton, quadrupole, simulation 438
 
  • A. Kilicgedik
    Marmara University, Istanbul, Turkey
  • A. Adiguzel, S. Esen
    Istanbul University, Istanbul, Turkey
  • B. Baran
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • A. Caglar
    YTU, Istanbul, Turkey
  • E. Celebi, E.V. Ozcan
    Bogazici University, Bebek / Istanbul, Turkey
  • U. Kaya
    Istinye University, Institute of Sciences, Istanbul, Turkey
  • G. Türemen
    TENMAK-NUKEN, Ankara, Turkey
  • G. Unel
    UCI, Irvine, California, USA
  • F. Yaman
    IZTECH, Izmir, Turkey
 
  Funding: This project are supported by The Scientific and Technological Research Council of Turkey (TUBITAK) Project no: 118E838
The 800 MHz RFQ (radio-frequency quadrupole), developed and built at KAHVElab (Kandilli Detector, Accelerator and Instrumentation Laboratory) at Bogazici University in Istanbul, Turkey, has been designed to provide protons that have an energy of 2 MeV within only 1 m length. The RFQ consists of two modules and the test module of RFQ was constructed. The algorithm developed by CERN, based on the measurements generated by the tuner settings estimated through the response matrix [1,2,3], has been optimized for a single module and 16 tuners. The desired field consistent with the simulation was obtained by bead pull measurements. In this study, we present low-power rf measurements and field tuning of the test module.
[1] Koubek, B., et al., PHY. REV. ACC. AND BEAMS 20,08010(2017)
[2] Koubek, B., et al., CERN-2017-0006,(2017)
[3] Pommerenke, Hermann W., et al., Nuc. Inst. and Meth. in Phy. Res. Sec.A),165564(2021)
 
poster icon Poster TUPOPA12 [1.699 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA12  
About • Received ※ 24 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 02 September 2022
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THPOGE02 Investigation of HiPIMS-Coated S(I)S Structures for SRF Cavities cavity, SRF, site, niobium 805
 
  • A.Ö. Sezgin, X. Jiang, M. Vogel
    University Siegen, Siegen, Germany
  • C.Z. Antoine
    CEA-IRFU, Gif-sur-Yvette, France
  • S. Keckert, J. Knobloch, O. Kugeler, D.B. Tikhonov
    HZB, Berlin, Germany
  • J. Knobloch
    University of Siegen, Siegen, Germany
  • O.B. Malyshev
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • R. Ries, E. Seiler
    Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava, Slovak Republic
  • L.G.P. Smith
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
 
  The sustainable next generation particle accelerators require innovative solutions to overcome the current technological challenges set by existing bulk niobium superconducting radio-frequency (SRF) cavities. Thin film-based multilayer structures in the form of superconductor-insulator-superconductor (SIS) may be the long-sought-after breakthrough for higher performance SRF cavities by enhancing both accelerating gradients and quality factors. In order to understand better the underlying mechanisms of SIS structures to be coated onto (S)RF cavities, we study various material properties with the resultant superconducting properties of high-power im-pulse magnetron sputtering (HiPIMS)-coated S(I)S structures of Nb-(AlN)-NbN with different thicknesses which are designed to be coated mainly on OFHC copper (Cu) samples for more efficient SRF cavities. This contribution presents materials properties of the aforementioned HiPIMS-coated S(I)S structures as well as the superconducting and RF behaviours of these multilayers which are assessed comparatively via DC and AC magnetization techniques.  
poster icon Poster THPOGE02 [0.747 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOGE02  
About • Received ※ 25 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 02 September 2022
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THPOGE16 Evaluation of Single-Cell Cavities Made of Forged Ingot Niobium at Jefferson Lab cavity, SRF, niobium, cryomodule 828
 
  • P. Dhakal, G. Ciovati, G.R. Myneni
    JLab, Newport News, Virginia, USA
  • G. Ciovati, B.D. Khanal
    ODU, Norfolk, Virginia, USA
  • G.R. Myneni
    BSCE, Yorktown, Virginia, USA
 
  Funding: This manuscript has been authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Currently, fine grain niobium (Nb) (grain size ~ 50 um) and large grain Nb (grain size of a few cm) are being used for the fabrication of superconducting radio frequency (SRF) cavities. Medium grain forged ingot with grain size of a few hundred um may be beneficial for cost-effectiveness as well as providing better performance for future SRF-based accelerators. Forged ingot Nb with medium grain size is a novel production method to obtain Nb discs used for the fabrication of superconducting radio frequency cavities. We have fabricated two 1.5 GHz single cell cavities made from forged Nb ingot with a residual resistivity ratio of ~100. The cavities were chemically and mechanically polished and heat-treated in the temperature range of 650-1000 C before the rf test. One of the cavities reached an accelerating gradient of 34 MV/m with a quality factor Q > 1e10, while the second cavity was limited at 14 MV/m, likely due to a weld defect at the equator.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOGE16  
About • Received ※ 22 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 03 September 2022 — Issue date ※ 15 September 2022
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