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Title: FIONDA (Filtering Images of Niobium Disks Application): Filter application for Eddy Current Scanner data analysis

Abstract

As part of the material QC process, each Niobium disk from which a superconducting RF cavity is built must undergo an eddy current scan [1]. This process allows to discover embedded defects in the material that are not visible to the naked eye because too small or under the surface. Moreover, during the production process of SC cavities the outer layer of Nb is removed via chemical or electro-chemical etching, thus it is important to evaluate the quality of the subsurface layer (in the order of 100nm) where superconductivity will happen. The reference eddy current scanning machine is operated at DESY; at Fermilab we are using the SNS eddy current scanner on loan, courtesy of SNS. In the past year, several upgrades were implemented aiming at raising the SNS machine performance to that of the DESY reference machine [2]. As part of this effort an algorithm that enables the filtering of the results of the scans and thus improves the resolution of the process was developed. The description of the algorithm and of the software used to filter the scan results is presented in this note.

Authors:
; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15020167
Report Number(s):
FERMILAB-TM-2313-TD
TRN: US0605075
DOE Contract Number:  
AC02-76CH03000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ALGORITHMS; CAVITIES; DATA ANALYSIS; DEFECTS; EDDY CURRENTS; ETCHING; EYES; FERMILAB; NIOBIUM; PERFORMANCE; PRODUCTION; RESOLUTION; SUPERCONDUCTIVITY; Accelerators

Citation Formats

Boffo, C., Bauer, P., and /Fermilab. FIONDA (Filtering Images of Niobium Disks Application): Filter application for Eddy Current Scanner data analysis. United States: N. p., 2005. Web. doi:10.2172/15020167.
Boffo, C., Bauer, P., & /Fermilab. FIONDA (Filtering Images of Niobium Disks Application): Filter application for Eddy Current Scanner data analysis. United States. doi:10.2172/15020167.
Boffo, C., Bauer, P., and /Fermilab. Sun . "FIONDA (Filtering Images of Niobium Disks Application): Filter application for Eddy Current Scanner data analysis". United States. doi:10.2172/15020167. https://www.osti.gov/servlets/purl/15020167.
@article{osti_15020167,
title = {FIONDA (Filtering Images of Niobium Disks Application): Filter application for Eddy Current Scanner data analysis},
author = {Boffo, C. and Bauer, P. and /Fermilab},
abstractNote = {As part of the material QC process, each Niobium disk from which a superconducting RF cavity is built must undergo an eddy current scan [1]. This process allows to discover embedded defects in the material that are not visible to the naked eye because too small or under the surface. Moreover, during the production process of SC cavities the outer layer of Nb is removed via chemical or electro-chemical etching, thus it is important to evaluate the quality of the subsurface layer (in the order of 100nm) where superconductivity will happen. The reference eddy current scanning machine is operated at DESY; at Fermilab we are using the SNS eddy current scanner on loan, courtesy of SNS. In the past year, several upgrades were implemented aiming at raising the SNS machine performance to that of the DESY reference machine [2]. As part of this effort an algorithm that enables the filtering of the results of the scans and thus improves the resolution of the process was developed. The description of the algorithm and of the software used to filter the scan results is presented in this note.},
doi = {10.2172/15020167},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {5}
}

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