Author: Yao, Z.Y.
Paper Title Page
WEPCAV009 Conceptual Design of Balloon Double Spoke Resonator 604
 
  • Z.Y. Yao, R.E. Laxdal
    TRIUMF, Vancouver, Canada
 
  Funding: TRIUMF receives funding via a contribution through the National Research Council Canada.
The balloon variant of the spoke resonator was proposed to eliminate the intensive multipacting (MP) barriers around the operating field level by modifying the local electro-magnetic (EM) fields. TRIUMF has previously reported the prototyping of a 325MHz β=0.3 single spoke resonator (SSR) that demonstrated the principle of the balloon concept. To extend the benefits of the balloon variant to multi-spoke resonators, this paper will report a conceptual design of a 325MHz β=0.5 balloon double spoke resonator (DSR). The consequences from the balloon SSR design, such as the relations between EM field distributions and the field levels of the MP barriers, were applied to the DSR design. Other particular geometry features were also added due to the characters of DSRs. The simulated MP barriers were significantly squeezed to the lower field level compared to a conventional DSR design. Simulation results and conceptual design will be reported.
 
poster icon Poster WEPCAV009 [2.260 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-WEPCAV009  
About • Received ※ 22 June 2021 — Revised ※ 20 December 2021 — Accepted ※ 01 March 2022 — Issue date ※ 18 April 2022
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THOFDV01
Results and Analysis from Multi-mode Coaxial Cavity Tests  
 
  • P. Kolb, T. Junginger, R.E. Laxdal, Z.Y. Yao
    TRIUMF, Vancouver, Canada
  • T. Junginger
    UVIC, Victoria, Canada
 
  TRIUMF fabricated two coaxial test cavities (one QWR and one HWR) in order to investigate the characterization of TEM-mode cavities with standard and novel surface treatments. The cavities are intended as the TEM mode equivalent to the 1.3 GHz single cell cavity, which is the essential tool for high frequency cavity research. Given these coaxial structure, the cavities allow testing at the fundamental mode and higher harmonics, giving unique insight into the role of RF frequency on fundamental loss mechanisms from intrinsic and extrinsic sources. This talk will report the results related to the various heat treatments: 120OC bake, Mid-T bake, and Infusion. The characterization will be over a broad frequency range. In addition initial flux expulsion studies from built in Helmholtz coils will also be presented.  
slides icon Slides THOFDV01 [6.090 MB]  
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