Quench Characteristics of a Cu-Stabilized 2G HTS Conductor

Young, E.A.; Chappell, Steven P.; Falorio, I.; Yang, Y.

doi:10.1109/tasc.2010.2083615

Cited by 12 publications

(3 citation statements)

References 10 publications

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“…When the applied current is greater than I c , the resistance of the superconducting part is assumed to follow the power law: ρ(T)=E c (J/J c (T)) n(T)−1 /J c (T). The resistivity of the non-superconducting part is equal to the resistivity of the damaged YBCO tape, which is warmed to about 600 degrees to destroy its superconductivity [23]. The current sharing between two parts in every segment can be calculated using iteration algorithm [24].…”

Section: Resultsmentioning

confidence: 99%

Study of the inhomogeneity of critical current underin-situtensile stress for YBCO tape

Zhu

Chen

Zhang

et al. 2018

Supercond. Sci. Technol.

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Hall sensor system was used to measure the local critical current of YBCO tape with high spatial resolution under in-situ tensile stress. The hot spot generation and minimum quench energy of YBCO tape, which depended on the local critical current, was calculated through the thermoelectric coupling model. With the increase in tensile stress, the cracks which have different dimensions and critical current degradation arose more frequently and lowered the thermal stability of the YBCO tape.

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Section: Resultsmentioning

confidence: 99%

Study of the inhomogeneity of critical current underin-situtensile stress for YBCO tape

Zhu

Chen

Zhang

et al. 2018

Supercond. Sci. Technol.

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“…Some research has already shown a more complex current sharing and normal zone propagation is expected for Roebel cables than those found in traditional superconducting composites due to the non-continuous touch contacts among the Roebel strands [1]- [3], [5]- [8]. Therefore, the standard method of experimental quench studies on adiabatic short conductors [9]- [11] becomes impractical for Roebel cables with long current sharing length [2].…”

Section: Introductionmentioning

confidence: 99%

Performance and Quench Characteristics of a Pancake Coil Wound With the 2G YBCO Roebel Cable

Zhang

Yang

Young

et al. 2018

IEEE Trans. Appl. Supercond.

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Abstract-The YBCO Roebel cable is a promising option for the high-energy accelerator magnets and tokamak devices with high-current carrying capability and compactness. Referring to the complex current sharing and normal zone propagation, it is difficult to apply the traditional superconductor quench measurement methodology to such a long Roebel cable (2 m) in an adiabatic condition. An alternative method for the quench measurement is to make a Roebel pancake coil cowound with ribbon fiberglass. This paper starts reporting the methodology to wind the coil with impregnation process and the wire installment for the quench measurement. Some initial performance measurements and a first trial of the quench measurement were processed in LN2 at 77 K to show the robust performance of this Roebel cable at all the current contacts while maintaining the cable effectively adiabatic or similar to real magnets.Index Terms-Roebel cable, pancake coil, high temperature superconductors, quench measurement.

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“…On top of the YBCO film, a metallic layer of several micrometer thickness is deposited as a thermal stabilizer. Now that a coated high-temperature superconductor tape with the desired current performance has been realized, we must improve our understanding of the thermal stability of the system in order to meet the performance requirements for various applications [2,3]. To this end, we must precisely simulate the two-dimensional transient heat conduction in a superconducting tape that can be employed safely under all possible conditions, including low temperature and high magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Out-of-Plane Thermal Conductivity of Epitaxial $$\hbox {YBa}_{2}\hbox {Cu}_{3}\hbox {O}_{7-{\delta }}$$ Thin Films in the Temperature Range from 10 K to 300 K by Photothermal Reflectance

et al. 2017

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We measured the out-of-plane (c-axis) thermal conductivity of epitaxially grown YBa 2 Cu 3 O 7−δ (YBCO) thin films (250 nm, 500 nm and 1000 nm) in the temperature range from 10 K to 300 K using the photothermal reflectance technique. The technique enables us to determine the thermal conductivity perpendicular to a thin film on a substrate by curve fitting analysis of the phase lag between the thermoreflectance signal and modulated heating laser beam in the frequency range from 10 2 Hz to 10 6 Hz. The uncertainties of measured thermal conductivity of all samples were estimated to be within ±9 % at 300 K, ±12 % at 180 K, ±16 % at 90 K and ±20 % below 50 K. The experimental results show that the thermal conductivity is dependent on the thickness of the thin films across the entire temperature range. We also observed that the thermal conductivity of the present YBCO thin films showed T 1.4 to T 1.6 glass-like dependence below 50 K, even though the films are crystalline solids. In order to explain the reason for this temperature dependence, we attempted to analyze our results using phonon relaxation times for possible phonon scattering models, including stacking faults, grain boundary and tunneling states scattering models.

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Quench Characteristics of a Cu-Stabilized 2G HTS Conductor

Cited by 12 publications

References 10 publications

Study of the inhomogeneity of critical current underin-situtensile stress for YBCO tape

Study of the inhomogeneity of critical current underin-situtensile stress for YBCO tape

Performance and Quench Characteristics of a Pancake Coil Wound With the 2G YBCO Roebel Cable

Measurement of Out-of-Plane Thermal Conductivity of Epitaxial $$\hbox {YBa}_{2}\hbox {Cu}_{3}\hbox {O}_{7-{\delta }}$$ Thin Films in the Temperature Range from 10 K to 300 K by Photothermal Reflectance

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