The RF performance of cavity made from defective niobium material determined by Eddy Current Scanning

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Eddy current scanning (ECS) has been used to screen niobium sheets to avoid defective material being used in costly cavity fabrication. The evaluation criterion of this quality control tool is not well understood. Past surface studies showed some features were shallow enough to be removed by chemical etching. The remaining features were identified to be small number of deeper inclusions, but mostly unidentifiable features (by chemical analysis). A real cavity made of defective niobium material has been tested. The cavity achieved high performance with comparable results to the cavities made from defect free cavities. Temperature mapping could help to define ... continued below

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3 pages

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Wu, G.; Cooley, L.; Sergatskov, D.; Ozelis, J.; /Fermilab; Brinkmann, A. et al. October 1, 2010.

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Description

Eddy current scanning (ECS) has been used to screen niobium sheets to avoid defective material being used in costly cavity fabrication. The evaluation criterion of this quality control tool is not well understood. Past surface studies showed some features were shallow enough to be removed by chemical etching. The remaining features were identified to be small number of deeper inclusions, but mostly unidentifiable features (by chemical analysis). A real cavity made of defective niobium material has been tested. The cavity achieved high performance with comparable results to the cavities made from defect free cavities. Temperature mapping could help to define the control standard clearly.

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3 pages

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  • Journal Name: Submitted to IEEE Trans.Appl.Supercond.; Conference: Presented at Applied Superconductivity Conference (ASC 2010), Washington, D.C., 1-6 Aug 2010

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  • Report No.: FERMILAB-CONF-10-429-TD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 993215
  • Archival Resource Key: ark:/67531/metadc1013396

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Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 25, 2017, 11:57 a.m.

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Wu, G.; Cooley, L.; Sergatskov, D.; Ozelis, J.; /Fermilab; Brinkmann, A. et al. The RF performance of cavity made from defective niobium material determined by Eddy Current Scanning, article, October 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1013396/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.