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

Abstract

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.

Authors:
; ;  [1];  [2];  [1]
  1. INFN Milano–LASA, Segrate, MI (Italy)
  2. DESY, Hamburg (Germany)
Publication Date:
OSTI Identifier:
22482808
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; DEFECTS; DETECTION; FLUORESCENCE; GHZ RANGE 01-100; IMPURITIES; NIOBIUM; PERFORMANCE; PROBES; RESOLUTION; SENSITIVITY; SUPERCONDUCTING CAVITY RESONATORS; SURFACES; X RADIATION; X-RAY FLUORESCENCE ANALYSIS

Citation Formats

Bertucci, M., Michelato, P., Moretti, M., Navitski, A., Pagani, C., and Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, Milano. Defect detection inside superconducting 1.3 GHz cavities by means of x-ray fluorescence spectroscopy. United States: N. p., 2016. Web. doi:10.1063/1.4939611.
Bertucci, M., Michelato, P., Moretti, M., Navitski, A., Pagani, C., & Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, Milano. Defect detection inside superconducting 1.3 GHz cavities by means of x-ray fluorescence spectroscopy. United States. https://doi.org/10.1063/1.4939611
Bertucci, M., Michelato, P., Moretti, M., Navitski, A., Pagani, C., and Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, Milano. 2016. "Defect detection inside superconducting 1.3 GHz cavities by means of x-ray fluorescence spectroscopy". United States. https://doi.org/10.1063/1.4939611.
@article{osti_22482808,
title = {Defect detection inside superconducting 1.3 GHz cavities by means of x-ray fluorescence spectroscopy},
author = {Bertucci, M. and Michelato, P. and Moretti, M. and Navitski, A. and Pagani, C. and Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, Milano},
abstractNote = {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.},
doi = {10.1063/1.4939611},
url = {https://www.osti.gov/biblio/22482808}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 1,
volume = 87,
place = {United States},
year = {Fri Jan 15 00:00:00 EST 2016},
month = {Fri Jan 15 00:00:00 EST 2016}
}