Keyword: superconducting-cavity
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TUPO035 Determination of the Field-dependence of the Surface Resistance of Superconductors from Cavity Tests cavity, experiment, electromagnetic-fields, SRF 405
 
  • J.R. Delayen, S.U. De Silva, H. Park
    ODU, Norfolk, Virginia, USA
 
  Cryogenic tests of superconducting cavities yield an average surface resistance as a function of the peak surface magnetic field. An analytical formalism has been developed to extract the actual field dependence of the surface resistance from cavity tests and is applied to coaxial cavities and cavities of more complex geometries.  
slides icon Slides TUPO035 [0.524 MB]  
poster icon Poster TUPO035 [1.002 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO035  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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TUPO052 Design Study of a Prototype 325MHz RF Power Coupler for Superconducting Cavity simulation, cavity, pick-up, resonance 451
 
  • J.Y. Yoon, J.B. Bhang, H.J. Cha, S.W. Jang, E.-S. Kim, K.R. Kim, C.S. Park, S. H. Park
    Korea University Sejong Campus, Sejong, Republic of Korea
  • E. Kako
    KEK, Ibaraki, Japan
  • D.Y. Kim, J. Lee
    Vitzrotech Co., Ltd., Ansan City, Kyunggi-Do, Republic of Korea
  • I. Shin
    IBS, Daejeon, Republic of Korea
 
  Funding: Korea University (Sejong Campus) in South KOREA
We present design studies of a prototype RF input power coupler, which provides RF powers to 325MHz cavities up to 18.5 kW in CW mode. The prototype power coupler is a coaxial capacitive type with single ceramic window. In order to optimize the RF coupler design, we performed multi-physics simulations, including electromagnetic, thermal, and mechanical analyses.
 
poster icon Poster TUPO052 [1.607 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO052  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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TUPO053 Fabrication of Nb Mushroom Shaped Cavity for Evaluation of Multi-layer Thin-film Superconductor cavity, vacuum, electromagnetic-fields, cryogenics 454
 
  • H. Oikawa
    Utsunomiya University, Utsunomiya, Japan
  • K. Enami, H. Hayano, H. Inoue
    KEK, Ibaraki, Japan
  • T. Higashiguchi
    Center for Optical Research and Education, Utsunomiya University, Utsunomiya, Japan
 
  The accelerating gradient of the Nb superconducting RF cavity seems to reach the limit due to the RF critical magnetic field of the Nb material. To obtain more higher gradient, there has been proposed a method of increasing an RF critical magnetic field of the cavity inner surface by coating of multi-layer thin-film superconductor. It is needed to demonstrate improvement RF critical magnetic field of the RF cavity coated with multi-layer thin-film superconductor. To optimize thin-film superconductor, sample tests are required. A cavity for sample test is necessary to produce a strong RF magnetic field parallel to the surface of the sample for evaluating RF critical magnetic field. For such a cavity, we designed a mushroom shaped cavity made of Nb which is operated in cryogenic temperature. Input and pick up antenna coupler are also designed electrically and mechanically. The connection design of sample plate and cavity bottom plate in superconducting state is also designed. The Nb mushroom shaped cavity is under fabrication. Fabrication method and status are reported in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO053  
About • paper received ※ 17 September 2018      issue date ※ 18 January 2019  
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