Assessment of Cryogenic Thermography System Using Commercial Fluorescent Paints on Their Applicability to Visualization of Normal-Zone Propagation in YBCO Coated Conductor

Ishiyama, Atsushi; Tsuchiya, Mitsuyoshi; Ueda, Hiroshi; Shiohara, Yuh

doi:10.1109/tasc.2007.899124

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…Among these are fluorescent paints, which have been used to visualize the two-dimensional temperature distribution during quench propagation in YBCO coated conductors, 5 and digital speckle pattern interferometry ͑DSPI͒, used to detect the inhomogeneous heating, associated with hot spot generation, of Bi 2 Sr 2 CaCu 2 O 8+␦ textured ceramics. Among these are fluorescent paints, which have been used to visualize the two-dimensional temperature distribution during quench propagation in YBCO coated conductors, 5 and digital speckle pattern interferometry ͑DSPI͒, used to detect the inhomogeneous heating, associated with hot spot generation, of Bi 2 Sr 2 CaCu 2 O 8+␦ textured ceramics.…”

Section: Quench Detection In Yba 2 Cu 3 O 7−␦ Coated Conductors Usingmentioning

confidence: 99%

Quench detection in YBa2Cu3O7−δ coated conductors using interferometric techniques

Angurel

Martínez

Lera

et al. 2008

Journal of Applied Physics

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Digital speckle pattern interferometry has been used to detect inhomogeneous heating in YBa 2 Cu 3 O 7−␦ coated conductors. The analysis was performed in a sample with a controlled defect, which causes a significant local reduction in the critical current value, I c . The experiments, which were performed with the sample surrounded by nitrogen vapor, have shown that the location of the initial hot spot leading to the complete transition to the normal state of the conductor ͑quench͒ is strongly dependent on the sample cooling configuration. When the sample is mainly cooled by gas convection, the quench always starts in the low-I c region, while for improved cooling configurations the initial hot spot does not always coincide with this region. The results have been compared with those obtained by direct electric field measurements along the sample in nitrogen vapor and liquid.

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Section: Quench Detection In Yba 2 Cu 3 O 7−␦ Coated Conductors Usingmentioning

confidence: 99%

Quench detection in YBa2Cu3O7−δ coated conductors using interferometric techniques

Angurel

Martínez

Lera

et al. 2008

Journal of Applied Physics

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“…Thus, the development of effective approaches to quench detection and protection require a more detailed understanding of the microscopic behaviors. Recently, visualization of normal zone propagation in YBCO CC has been demonstrated through fluorescent paints [15] and a digital speckle pattern interferometer [16]. Neither of these approaches, however, provides sufficiently detailed information regarding the current distribution as a function of time and space.…”

Section: Introductionmentioning

confidence: 99%

Dynamic magneto-optical imaging of transport current redistribution and normal zone propagation in YBa₂Cu₃O_7−δcoated conductor

Song¹,

Davidson²,

Schwartz³

2009

Supercond. Sci. Technol.

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YBa 2 Cu 3 O 7−δ (YBCO) coated conductors carry high critical current density with the potential for low cost and thus have a broad range of potential applications. An unresolved issue that could inhibit implementation, however, is a lack of understanding of the current redistribution and normal zone propagation behavior in the event of a thermal disturbance (quench). In this work, we for the first time present the real-time, dynamic observation of magnetic field redistribution during a thermal disturbance via magneto-optical imaging with a high speed, high resolution CCD (charge coupled device) camera. The optical images are converted to a two-dimensional, time-dependent data set that is then analyzed quantitatively. It is found that the normal zone propagates non-uniformly in two dimensions within the YBCO layer. Two stages of normal zone propagation are observed. During the first stage, the normal zone propagates along the conductor length as the current and magnetic field redistribute within the YBCO layer. During the second stage, current sharing with the Cu begins and the magneto-optical image becomes constant. The normal zone propagation velocity at 45 K, I = 50 A (∼50% I c ), is determined as 22.7 mm s −1 using the time-dependent optical light intensity data.

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“…In practical use FMI has been applied in several reports for electronic failure analysis [3][4][5], failure in solar cell [6] and study of biologicals cells [7]. Heat generation in superconductors has been measured at temperatures down to 50 K [8][9][10]. Thermal imaging was also demonstrated in wind tunnel experiments at 110 K [11].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent photoluminescence down to 4.2K in EuTFC

Haugen¹,

Johansen²

2008

Journal of Luminescence

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Assessment of Cryogenic Thermography System Using Commercial Fluorescent Paints on Their Applicability to Visualization of Normal-Zone Propagation in YBCO Coated Conductor

Cited by 9 publications

References 6 publications

Quench detection in YBa2Cu3O7−δ coated conductors using interferometric techniques

Quench detection in YBa2Cu3O7−δ coated conductors using interferometric techniques

Dynamic magneto-optical imaging of transport current redistribution and normal zone propagation in YBa₂Cu₃O_7−δcoated conductor

Temperature dependent photoluminescence down to 4.2K in EuTFC

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Assessment of Cryogenic Thermography System Using Commercial Fluorescent Paints on Their Applicability to Visualization of Normal-Zone Propagation in YBCO Coated Conductor

Cited by 9 publications

References 6 publications

Quench detection in YBa2Cu3O7−δ coated conductors using interferometric techniques

Quench detection in YBa2Cu3O7−δ coated conductors using interferometric techniques

Dynamic magneto-optical imaging of transport current redistribution and normal zone propagation in YBa2Cu3O7−δcoated conductor

Temperature dependent photoluminescence down to 4.2K in EuTFC

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Product

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About

Dynamic magneto-optical imaging of transport current redistribution and normal zone propagation in YBa₂Cu₃O_7−δcoated conductor