Analysis of Quench Initiation in YBCO Coated Conductors Using Optical Interferometric Techniques

Quench initiation in homogeneous YBa 2 Cu 3 O 7-delta (YBCO) coated conductors in nitrogen vapor has been analyzed using digital speckle pattern interferometry (DSPI) and measurements of the temporal evolution of the electric field along the conductor. These optical experiments can detect sample sur...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2009-06, Vol.19 (3), p.3479-3482
Main Authors: Angurel, L.A., Martinez, E., Lera, F., Recuero, S., Andres, N., Arroyo, M.P., Yi-Yuan Xie, Selvamanickam, V.
Format: Article
Language:English
Subjects:
Adaptive optics
Applied sciences
Coated conductors
COATINGS
Conducting materials
Conductors
Conventions
COPPER OXIDE
Electric connection. Cables. Wiring
Electric fields
Electric variables measurement
ELECTRICAL CONDUCTORS
Electrical engineering. Electrical power engineering
Electromagnets
Exact sciences and technology
HEATING
INTERFEROMETRY
LIQUID NITROGEN
Nitrogen
Optical detectors
Optical interferometry
Origins
Pattern analysis
QUENCHING MECHANISMS
Speckle
Stabilization
SUPERCONDUCTORS
thermal stability
Various equipment and components
YBCO superconductors
Yttrium barium copper oxide
YTTRIUM OXIDE
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Summary:Quench initiation in homogeneous YBa 2 Cu 3 O 7-delta (YBCO) coated conductors in nitrogen vapor has been analyzed using digital speckle pattern interferometry (DSPI) and measurements of the temporal evolution of the electric field along the conductor. These optical experiments can detect sample surface displacements smaller than 100 nm in the perpendicular direction. In these quench experiments, displacements are caused by dilatation effects associated with heat generation during the transition to the normal state. DSPI detects a multispot origin of quench initiation in these homogeneous materials. This confirms that, in addition to I c distributions, there are other factors as inhomogeneities in thermal stabilizations that strongly determine sample quench behavior. The knowledge of the origin of this behavior is important for the design of different applications. The technique has been improved in order to characterize samples immersed in liquid nitrogen. The first results in 0.025 mm-thick Cu foils immersed in liquid nitrogen are presented. In addition to sample heating, DSPI allows the visualization of liquid nitrogen convention movements.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2009.2018029