The role of nickel substrates in the quench dynamics of silver coated YBCO tapes

Duckworth, R. C.; Lue, J.W.; Lee, D.F.; Grabovickic, R.; Gouge, M.J.

doi:10.1109/tasc.2003.812887

Cited by 31 publications

(21 citation statements)

References 3 publications

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“…Specifically, unusual effects were reported in the literature regarding normal zone propagation in coated conductors [9,10]. During a quench a potential difference has been detected between the stabilizer and substrate.…”

Section: Introductionmentioning

confidence: 80%

“…The anomalies of the electric field distribution in the substrate during quench [9,10] can be accounted for by a large value of the screening length in the substrate, comparable to the length of the sample. As the result, an electric field and relatively small longitudinal current exist in the substrate well outside the normal zone.…”

Section: Summary and Speculationmentioning

confidence: 99%

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The normal zone in YBa₂Cu₃O_6+x-coated conductors

Levin

Barnes

2007

Supercond. Sci. Technol.

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We consider the distribution of an electric field in YBCO-coated conductors for a situation in which the DC transport current is forced into the copper stabilizer due to a weak link -a section of the superconducting film with a critical current less than the transport current. The electric field in the metal substrate is also discussed. The results are compared with recent experiments on normal zone propagation in coated conductors for which the substrate and stabilizer are insulated from each other. The potential difference between the substrate and stabilizer, and the electric field in the substrate outside the normal zone can be accounted for by a large screening length in the substrate, comparable to the length of the sample. During a quench, the electric field inside the interface between YBCO and stabilizer, as well as in the buffer layer, can be several orders of magnitude greater than the longitudinal macroscopic electric field inside the normal zone. We speculate on the possibility of using possible microscopic electric discharges caused by this large (∼kV/cm) electric field as a means to detect a quench.

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Section: Introductionmentioning

confidence: 80%

Section: Summary and Speculationmentioning

confidence: 99%

The normal zone in YBa₂Cu₃O_6+x-coated conductors

Levin

Barnes

2007

Supercond. Sci. Technol.

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“…Due to the technological interest of YBCO coated conductors [4], thermal stabilization and quench protection studies are necessary in order to establish appropriate stability criteria [5]- [10]. DSPI is a complementary technique, which can provide additional information to understand the phenomena taking place during the transition to the normal state of these superconducting materials.…”

Section: Introductionmentioning

confidence: 99%

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

Angurel

Martínez

Lera

et al. 2009

IEEE Trans. Appl. Supercond.

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Quench initiation in homogeneous YBa 2 Cu 3 O 7 (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 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.

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“…In general, quench protection requires timely quench detection with an effective approach for eliminating false positives, followed by a protective response that prevents conductor degradation. While quench protection is well understood for NbTi-and Nb 3 Sn-based superconducting magnets, REBCO CCs and magnets have very slow normal zone propagation velocity (NZPV), rendering quench detection particularly challenging [7]- [17]. Thus, one important goal is to develop REBCO-based magnets that not only are stable, with the ability to tolerate a relatively large disturbance, but also have a sufficient NZPV for effective quench detection and protection.…”

mentioning

confidence: 99%

“…Variations in the CC geometry or material properties can profoundly affect its quench characteristics, including the NZPV, energy margin, and the time-and spatially varying voltage and temperature within the conductor [7], [8], [12], [23]- [28]. Due to differences in coefficients of thermal expansion (CTEs) of the constituent layers, changes in temperature and temperature gradient can dramatically alter the thermal stresses and strains within the CC during a quench, leading to conductor degradation.…”

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confidence: 99%

A Hierarchical Three-Dimensional Multiscale Electro–Magneto–Thermal Model of Quenching in $\hbox{REBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated-Conductor-Based Coils

Chan

Schwartz

2012

IEEE Trans. Appl. Supercond.

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Quench detection and protection in REBa 2 Cu 3 O 7−δ (REBCO) coated conductor (CC)-based superconducting magnets is difficult due to slow normal zone propagation velocity and the multilayer composite architecture of the conductor. To design effective quench detection and protection methods, it is essential to know the electrical, thermal, and structural behavior during the quench at multiple length scales ranging from the micrometer scale within the layers of the conductor to the macroscopic behavior of the coil. Here, a hierarchical multiscale approach is used to develop a modular 3-D electro-magneto-thermal coil quench model. The model uses an accurate experimentally validated micrometer-scale REBCO CC model as the basic building block. The CC model is embedded within a homogenized coil framework at one or more locations in the form of multilayer tape modules. This multiscale approach makes possible the studies of quench behavior at the micrometer scale within a tape at any location of interest within a coil without requiring a computationally extensive model of the entire coil. This approach also enables the building of more complicated models by hierarchically integrating smaller modular blocks with the same repeatable modeling techniques. Here, the development of the electro-magneto-thermal coil quench model is first presented, followed by its experimental validation. Simulation results and their implications for coil reliability and quench detection and protection are then discussed.Index Terms-High-aspect-ratio thin layer, multiscale coil model, REBa 2 Cu 3 O 7−δ (REBCO), 3-D quench modeling.

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The role of nickel substrates in the quench dynamics of silver coated YBCO tapes

Cited by 31 publications

References 3 publications

The normal zone in YBa₂Cu₃O_6+x-coated conductors

The normal zone in YBa₂Cu₃O_6+x-coated conductors

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

A Hierarchical Three-Dimensional Multiscale Electro–Magneto–Thermal Model of Quenching in $\hbox{REBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated-Conductor-Based Coils

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The role of nickel substrates in the quench dynamics of silver coated YBCO tapes

Cited by 31 publications

References 3 publications

The normal zone in YBa2Cu3O6+x-coated conductors

The normal zone in YBa2Cu3O6+x-coated conductors

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

A Hierarchical Three-Dimensional Multiscale Electro–Magneto–Thermal Model of Quenching in $\hbox{REBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated-Conductor-Based Coils

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The normal zone in YBa₂Cu₃O_6+x-coated conductors

The normal zone in YBa₂Cu₃O_6+x-coated conductors