Author: Miyazaki, A.
Paper Title Page
MOPFAV004 First Vertical Test of a Prototype Crab Cavity for HL-LHC at FREIA Laboratory in Uppsala University 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 ※ doi: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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Evidence of Reduced Magnetic Sensitivities in Low Beta SRF Cavities  
  • D. Longuevergne
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • A. Miyazaki
    Uppsala University, Uppsala, Sweden
  Dedicated flux trapping experiments have been carried out on different types of low-beta superconducting accelerating cavities. The measured magnetic sensitivities of these complex geometries can be significantly lower than the predicted values calculated by commonly-used material-based models. In this paper, we suggest a new approach beyond the present material based models. Indeed, both the ambient magnetic field orientation and cavity geometry have a significant impact on the cavity performance degradation due to magnetic trapped flux. Experimental data are presented, and a new model to interpret the geometrical effect is introduced, assessed and shows as well very good agreement with data from the literature.  
slides icon Slides TUOFDV04 [1.265 MB]  
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TUPTEV012 Progress and Preliminary Statistics for the ESS Series Spoke Cryomodule Test 512
  • H. Li, K. Fransson, K.J. Gajewski, L. Hermansson, A. Miyazaki, R.J.M.Y. Ruber, R. Santiago Kern, M. Zhovner
    Uppsala University, Uppsala, Sweden
  The European spallation source (ESS), as a world-class high power proton accelerator facility, will be the first one to adopt 26 double spoke resonators (DSR) at its low energy section. As a new superconducting accelerating structure, these DSRs are therefore considered key technology and a challenge for the whole project. They will be the first DSRs in the world to be commissioned for a high power proton accelerator. Since 2019, FREIA Laboratory, Uppsala university, has successfully tested the first DSR prototype cryomodule and is now in charge of the acceptance tests of the ESS series cryomodules prior to installation in the tunnel. The cryomodule test, including cryogenic and RF testing, verifies operation of the cavities, couplers and cold tuning systems. This poster will present the test results for the ESS series spoke cryomodules, including preliminary statistics, experience in general.  
poster icon Poster TUPTEV012 [0.898 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2021-TUPTEV012  
About • Received ※ 21 June 2021 — Revised ※ 18 December 2021 — Accepted ※ 06 May 2022 — Issue date ※ 06 May 2022
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