Eddy current scanning of niobium for SRF cavities at Fermilab

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In the framework of SRF cavity development, Fermilab is creating the infrastructure needed for the characterization of the material used in the cavity fabrication. An important step in the characterization of ''as received'' niobium sheets is eddy current scanning. Eddy current scanning is a non-destructive technique first adopted and further developed by DESY with the purpose of checking the cavity material for subsurface defects and inclusions. Fermilab has received and further upgraded a commercial eddy current scanner previously used for the SNS project. This scanner is now used daily to scan the niobium sheets for the Fermilab third harmonic, the ... continued below

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4 pages

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Boffo, C.; Bauer, P.; Foley, M.; Antoine, C.; Cooper, C.; /Fermilab et al. August 1, 2006.

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Description

In the framework of SRF cavity development, Fermilab is creating the infrastructure needed for the characterization of the material used in the cavity fabrication. An important step in the characterization of ''as received'' niobium sheets is eddy current scanning. Eddy current scanning is a non-destructive technique first adopted and further developed by DESY with the purpose of checking the cavity material for subsurface defects and inclusions. Fermilab has received and further upgraded a commercial eddy current scanner previously used for the SNS project. This scanner is now used daily to scan the niobium sheets for the Fermilab third harmonic, the ILC, and the Proton Driver cavities. After optical inspection, more than 400 squares and disks have been scanned and when necessary checked at the optical and electron microscopes, anodized, or measured with profilometers looking for surface imperfections that might limit the performance of the cavities. This paper gives a status report on the scanning results obtained so far, including a discussion of the classification of signals being detected.

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4 pages

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  • Journal Name: IEEE Trans.Appl.Supercond.17:1326-1329,2007; Conference: Presented at Applied Superconductivity Conference (ASC 2006), Seattle, Washington, 27 Aug - 1 Sep 2006

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  • Report No.: FERMILAB-CONF-06-286-TD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 901116
  • Archival Resource Key: ark:/67531/metadc886231

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 7, 2016, 10:59 a.m.

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Boffo, C.; Bauer, P.; Foley, M.; Antoine, C.; Cooper, C.; /Fermilab et al. Eddy current scanning of niobium for SRF cavities at Fermilab, article, August 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc886231/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.