Defect detection inside superconducting 1.3 GHz cavities by means of x-ray fluorescence spectroscopy

X-ray fluorescence probe for detection of foreign material inclusions on the inner surface of superconducting cavities has been developed and tested. The setup detects trace element content such as a few micrograms of impurities responsible for thermal breakdown phenomena limiting the cavity perform...

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Bibliographic Details
Published in:Review of scientific instruments 2016-01, Vol.87 (1), p.013103-013103
Main Authors: Bertucci, M, Michelato, P, Moretti, M, Navitski, A, Pagani, C
Format: Article
Language:English
Subjects:
Angular resolution
DEFECTS
DETECTION
Equatorial regions
FLUORESCENCE
Fluorescent indicators
GHZ RANGE 01-100
Holes
IMPURITIES
Inclusions
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Lateral displacement
Localization
NIOBIUM
PROBES
RESOLUTION
Scientific apparatus & instruments
SENSITIVITY
SUPERCONDUCTING CAVITY RESONATORS
Superconductivity
SURFACES
Trace elements
X RADIATION
X-ray fluorescence
X-RAY FLUORESCENCE ANALYSIS
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Summary:X-ray fluorescence probe for detection of foreign material inclusions on the inner surface of superconducting cavities has been developed and tested. The setup detects trace element content such as a few micrograms of impurities responsible for thermal breakdown phenomena limiting the cavity performance. The setup has been customized for the geometry of 1.3 GHz TESLA-type niobium cavities and focuses on the surface of equator area at around 103 mm from the centre axis of the cavities with around 20 mm detection spot. More precise localization of inclusions can be reconstructed by means of angular or lateral displacement of the cavity. Preliminary tests confirmed a very low detection limit for elements laying in the high efficiency spectrum zone (from 5 to 10 keV), and a high angular resolution allowing an accurate localization of defects within the equator surface.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4939611