Normal Zone Propagation Velocity in 2G HTS Coated Conductor With High Interfacial Resistance

Lacroix, Christian; Fournier-Lupien, Jean-Hughes; McMeekin, Kevin; Sirois, Frédéric

doi:10.1109/tasc.2013.2239696

Cited by 36 publications

(41 citation statements)

References 11 publications

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“…The observed improvement is, however, somewhat limited, and may still be insufficient to enable the use of conventional voltage-based quench detection schemes. An interesting approach to increasing the NZPV in coated conductors by means of increasing interfacial resistance between the superconductor and stabilizer was proposed in [100] and further developed in [101]. Effects of the interfacial resistance on the current transfer between the superconductor and the stabilizer layer were studied in detail by Levin et al [24], who showed that the current diffusion length L = R int d n /ρ n , where R int is the interfacial resistance and d n and ρ n are stabilizer thickness and normal state resistivity, respectively; where it replaces the thermal diffusion length in the heat transfer equation, leading to a faster quench propagation.…”

Section: Conductor Modificationmentioning

confidence: 99%

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Marchevsky

2021

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High-temperature superconductors (HTS) are being increasingly used for magnet applications. One of the known challenges of practical conductors made with high-temperature superconductor materials is a slow normal zone propagation velocity resulting from a large superconducting temperature margin in combination with a higher heat capacity compared to conventional low-temperature superconductors (LTS). As a result, traditional voltage-based quench detection schemes may be ineffective for detecting normal zone formation in superconducting accelerator magnet windings. A developing hot spot may reach high temperatures and destroy the conductor before a practically measurable resistive voltage is detected. The present paper discusses various approaches to mitigating this problem, specifically focusing on recently developed non-voltage techniques for quench detection.

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Section: Conductor Modificationmentioning

confidence: 99%

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Marchevsky

2021

Instruments

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“…Low values for NZP V represent a severe problem for HTS-based devices. New layouts for the CC are being investigated in order to improve the quench propagation velocity [12,13].…”

Section: Thermal Stabilitymentioning

confidence: 99%

High-field thermal transport properties of REBCO coated conductors

Bonura

Senatore

2014

Supercond. Sci. Technol.

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The use of REBCO coated conductors is envisaged for many applications, extending from power cables to high-field magnets. Whatever the case, thermal properties of REBCO tapes play a key role for the stability of superconducting devices. In this work, we present the first study on the longitudinal thermal conductivity (κ) of REBCO coated conductors in magnetic fields up to 19 T applied both parallelly and perpendicularly to the thermal-current direction. Copper-stabilized tapes from six industrial manufacturers have been investigated. We show that zero-field κ of coated conductors can be calculated with an accuracy of ±15% from the residual resistivity ratio of the stabilizer and the Cu/non-Cu ratio. Measurements performed at high fields have allowed us to evaluate the consistency of the procedures generally used for estimating in-field κ in the framework of the Wiedemann-Franz law from an electrical characterization of the materials. In-field data are intended to provide primary ingredients for the thermal stability analysis of high-temperature superconductor-based magnets.High-field thermal transport properties of REBCO coated conductors

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“…Means to increase this propagation velocity are investigated [11]. In the time scale (∆t: tens of ms), the small normal zone does not really expand and its resistance, proportional to its length remains very low compared to the fault impedance.…”

Section: Conductor Thickness (E Cond )mentioning

confidence: 99%