Author: Kolb, P.
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TUOFDV08 First Beta NMR Results on SRF Samples at TRIUMF 365
  • E. Thoeng, J.R. Adelman, A. Chatzichristos, M. Dehn, D. Fujimoto, V.L. Karner, R. Kiefl, W.A. MacFarlane, J.O. Ticknor
    UBC & TRIUMF, Vancouver, British Columbia, Canada
  • M. Asaduzzaman, T. Junginger
    UVIC, Victoria, Canada
  • R.A. Baartman, S.R. Dunsiger, T. Junginger, P. Kolb, R.E. Laxdal, C.D.P. Levy, Li,R. Li, R.M.L. McFadden, I. McKenzie, G. Morris, S. Saminathan, M. Stachura
    TRIUMF, Vancouver, Canada
  • D.L. Cortie
    University of Wollongong, Institute of Superconducting and Electronic Materials, Wollongong, New South Wales, Australia
  The \betaNMR (\beta-detected nuclear magnetic resonance) facility at TRIUMF offers the possibility of depth-resolved probing of the Meissner state over the first §I{100}{\nano\meter} below a sample surface. The measurement can give the attenuation of the applied magnetic field, as a function of depth. The technique can be especially important when probing layered systems like the dirty/clean S-S (superconductor-superconductor) bi-layer and S-I-S (Superconductor-Insulator-Superconductor) structures. The TRIUMF SRF (Superconducting RF) group has recently completed first measurements at beta-NMR on Nb samples with various treatments. The results and method will be reported.  
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About • Received ※ 09 July 2021 — Revised ※ 29 September 2021 — Accepted ※ 07 May 2022 — Issue date ※ 08 May 2022
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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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