Low temperature laser scanning microscopy of a superconducting radio-frequency cavity.

نویسندگان

  • G Ciovati
  • Steven M Anlage
  • C Baldwin
  • G Cheng
  • R Flood
  • K Jordan
  • P Kneisel
  • M Morrone
  • G Nemes
  • L Turlington
  • H Wang
  • K Wilson
  • S Zhang
چکیده

An apparatus was developed to obtain, for the first time, 2D maps of the surface resistance of the inner surface of an operating superconducting radio-frequency niobium cavity by a low-temperature laser scanning microscopy technique. This allows identifying non-uniformities of the surface resistance with a spatial resolution of about 2.4 mm and surface resistance resolution of ~1 μΩ at 3.3 GHz. A signal-to-noise ratio of about 10 dB was obtained with 240 mW laser power and 1 Hz modulation frequency. The various components of the apparatus, the experimental procedure and results are discussed in detail in this contribution.

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عنوان ژورنال:
  • The Review of scientific instruments

دوره 83 3  شماره 

صفحات  -

تاریخ انتشار 2012