Normal zone propagation experiments on HTS composite conductors

Trillaud, F.; Palanki, H; Trociewitz, U.P.; Thompson, Sam; Weijers, H.W.; Schwartz, J.

doi:10.1016/s0011-2275(03)00044-4

Cited by 103 publications

(43 citation statements)

References 2 publications

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“…However, even if applications are foreseen at temperatures ranging all the way from 4.2 K to 77 K and all of them typically involve current levels of several hundreds of amperes, almost all data available on the normal zone propagation velocity and minimal quench energies of ReBCO coated conductor lie in the temperature range of 40 − 77 K and currents below 100 A. Measurements on non-stabilized coated conductor samples in self field were performed by Trillaud [1] and Young [2]. Measurements on stabilized conductor are available from Wang [3], Angrisani [4] and Park [5].…”

Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of Normal Zone Propagation in a ReBCO Coated Conductor at Temperatures Below 50K

et al. 2015

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Measurements of the quasi-adiabatic normal zone propagation velocity and quench energies of a Superpower SCS4050 copper stabilised ReBCO superconducting tape are presented over a temperature range of 23 − 47 K; in parallel applied magnetic fields of 6, 10 and 14 T; and over a current range from 50% to 100% of I c . The data are compared to results of analytic predictions and to one-dimensional numerical simulations. The availability of long lengths of ReBCO coated conductor makes the material interesting for many HTS applications operating well below the boiling point of liquid nitrogen, such as magnets and motors. One of the main issues in the design of such devices is quench detection and protection. At higher temperatures, the quench velocities in these materials are known to be about two orders of magnitude lower compared to low temperature superconductors, resulting in significantly smaller normal zones and the risk of higher peak temperatures. To investigate whether the same also holds for lower temperatures more extended data sets are needed, both as input and as validation for numerical design tools. c 2014 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the organizing committee of ICEC 25-ICMC 2014.

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Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of Normal Zone Propagation in a ReBCO Coated Conductor at Temperatures Below 50K

et al. 2015

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“…Z. Zhong, H. S. Ruiz, Z. Huang, W. Wang, and T. Coombs are with the Engineering Department, University of Cambridge, Cambridge, CB3 0FA, U.K. e-mail: tac1000@cam.ac.uk or zz272@cam.ac.uk L. Lai was a visiting student at the Engineering Department, University of Cambridge, Cambridge, CB3 0FA, U.K, and is currently with the Department of Physics, Tsinghua University, Beijing, China. various cryogenic conditions, and typical results are given ranging from 5 mm/s to 20 mm/s for different applied current [3,4,[6][7][8][9]. However, according to our knowledge, not many studies have been done when superconducting composites are immersed in liquid nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Normal Zone Propagation Velocity in Double-Layer 2G-HTS Wires by Thermal and Electrical Methods

Zhong

Lai

Huang

et al. 2015

IEEE Trans. Appl. Supercond.

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“…Depending upon cooling conditions, such zone may either become persistent, corresponding to the flux flow regime at temperatures below critical, or develop into a normal zone heated above the critical temperature. An expansion of the latter is impeded by the same factors that cause high conductor stability: normal zone propagation in HTS is 2-3 orders of magnitude slower than in conventional superconductors [5]- [8]. As a consequence, a significant local temperature rise would yield only a modest resistive voltage that is hard to detect in the noisy (inductive voltages, power supply ripple, etc.)…”

Section: Introductionmentioning

confidence: 99%

Quench Detection for High-Temperature Superconductor Conductors Using Acoustic Thermometry

Marchevsky

Hershkovitz

Wang

et al. 2018

IEEE Trans. Appl. Supercond.

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Abstract-Detecting local heat-dissipating zones in hightemperature superconductor (HTS) magnets is a challenging task due to slow propagation of such zones in HTS conductors. For long conductor lengths voltage-based methods may not provide a sufficient sensitivity or redundancy, and therefore non-voltage based detection alternatives are being sought. One of those is the recently proposed method of Eigen Frequency Thermometry (EFT), which is an active acoustic technique for a fast and non-intrusive detection of "hot spots", utilizing temperature dependence of the conductor elastic moduli. In the present work, we demonstrate efficiency of EFT for detecting localized heating in a 1.2 m-long sample of REBCO tape immersed in liquid nitrogen, and benchmark sensitivity of the acoustic detection with respect to voltage, hot spot temperature, and power dissipation in the conductor. Modifying the original technique for differential mode of operation enables a much improved sensitivity, and adds a hot spot localization capability. Furthermore, we adapt this technique to subscale coils wound with REBCO CORC® conductor built in the framework of US Magnet Development Program. A successful thermal-based detection of dissipation onset at the critical current for a two-layer canted CORC® dipole assembly is discussed. Index Terms-Acoustic sensors, temperature sensors, superconducting coils, high-temperature superconductors, quench detection.

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Normal zone propagation experiments on HTS composite conductors

Cited by 103 publications

References 2 publications

Measurement and Analysis of Normal Zone Propagation in a ReBCO Coated Conductor at Temperatures Below 50K

Measurement and Analysis of Normal Zone Propagation in a ReBCO Coated Conductor at Temperatures Below 50K

Experimental Study of the Normal Zone Propagation Velocity in Double-Layer 2G-HTS Wires by Thermal and Electrical Methods

Quench Detection for High-Temperature Superconductor Conductors Using Acoustic Thermometry

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