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

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

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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Review of scientific instruments 2012-03, Vol.83 (3), p.034704-034704-12
Hauptverfasser: 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.
Format: Artikel
Sprache:eng
Schlagworte:
cavitation
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
laser beams
laser resonators
LASERS
MICROSCOPY
MODULATION
NIOBIUM
SIGNAL-TO-NOISE RATIO
SPATIAL RESOLUTION
surface finishing
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung: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 μ Ω 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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3694570