Low temperature laser scanning microscopy of a superconducting radio-frequency cavity
| Autor: | Ciovati, G., Anlage, Steven M., Baldwin, C., Cheng, G., Flood, R., Jordan, K., Kneisel, P., Morrone, M., Nemes, G., Turlington, L., Wang, H., Wilson, K., Zhang, S. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Rev. Sci. Instrum. 83, 034704 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.3694570 |
| Popis: | 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 one order of magnitude better than with earlier methods and surface resistance resolution of ~ 1 micro-Ohm 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. Comment: 19 pages, 17 figures, submitted to Rev. Sci. Instrum |
| Databáze: | arXiv |
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