Low temperature laser scanning microscopy of a superconducting radio-frequency cavity
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 01, 2012
- Source ID
- 10.1063/1.3694570
Entities
People
- C. Baldwin
- G. Ciovati
- G. Nemes
- Gong Cheng
- Hao Wang
- K. Jordan
- Katherine E. Wilson
- L. Turlington
- M. Morrone
- P. Kneisel
- R. Flood
- Simin Zhang
- Steven M Anlage
Organizations
- Office of Naval Research
- Thomas Jefferson National Accelerator Facility
- University of Maryland