Nondestructive Diagnostics of Narrow Coated Conductors for Electric Power Applications

Higashikawa, Kohei; Katahira, Kenta; Inoue, Masayoshi; Kiss, Takanobu; Shingai, Y.; Konishi, M.; Ohmatsu, K.; Machi, T.; Yoshizumi, M.; Izumi, Teruo; Shiohara, Yuh

doi:10.1109/tasc.2013.2291997

Cited by 20 publications

(9 citation statements)

References 12 publications

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“…One of the particular features of the second generation of HTS wires produced in the form of coated conductor (CC) tapes is that longitudinal nonuniformity is already present in the as-received tapes prior to subjecting them to electrical or mechanical stress. Therefore, reel-to-reel characterization became common usage for coated conductors, providing a single I c (x) plot, e.g., by the contactless magnetization technique [44][45][46][47] or with moving contacts [48,49]. However, sometimes it is not quite clear how to use this very detailed information in calculating the expected tape behavior.…”

Section: Introductionmentioning

confidence: 99%

Impact of critical current fluctuations on the performance of a coated conductor tape

Gömöry

Šouc

Adámek

et al. 2019

Supercond. Sci. Technol.

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Coated conductor (CC) tapes often exhibit critical current, Ic, which fluctuates along the length coordinate, x, leading to an Ic(x) dependence. The need to reduce the price of these tapes does not favor a decrease in the variation of Ic in the near future. Therefore, it is reasonable to develop a method for estimating the possible impact of such fluctuating transport ability on the performance of superconducting devices. Fortunately, providing Ic(x) data together with the delivered conductor is becoming a standard approach among CC tape producers, and in-depth analysis of such data is now possible. Extrapolation of the short sample testing methodology to the case of a device incorporating many meters of CC tape leads to the introduction of an ‘overall critical current’ as a value generating 1 μV cm−1 of electric field over the whole conductor. We show that in the case of Ic(x) fluctuations obeying the Gaussian distribution one can predict the value of the overall critical current from the mean value and the variance of the Ic(x) data set. Deviation from the Gaussian distribution found in real tapes would cause a further reduction of the overall critical current. Conversely, in the case of strong dropouts in the critical current value, a statistical approach is useless and one must analyze the probability of the weakest location developing in a hot spot with a dramatic increase of temperature. Extending the analysis for a single tape to cables and coils results in a rather simple summary: when current sharing is possible, the reduction of overall critical current with respect to its mean value is significantly depressed. This favors the parallel arrangement of tapes with low contact resistance allowing current migration from tape to tape. On the other hand, the insulation of tapes leads to the same overall critical current reduction as observed for a single tape.

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Section: Introductionmentioning

confidence: 99%

Impact of critical current fluctuations on the performance of a coated conductor tape

Gömöry

Šouc

Adámek

et al. 2019

Supercond. Sci. Technol.

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“…The second example is characterization of a commercial RE-123 coated conductor. A 200 m-long 5 mm-wide coated conductor fabricated by IBAD-PLD process was characterized by reel-to-reel scanning Hall-probe microscopy (RTR-SHPM) [43][44][45]. After continuously magnetizing the sample in a liquid nitrogen bath, two-dimensional distribution of remanent magnetic field was measured by scanning a Hall sensor in width direction on the sample which was moving in longitudinal direction.…”

Section: Sample and Experimentalmentioning

confidence: 99%

Scanning Hall-probe microscopy for site-specific observation of microstructure in superconducting wires and tapes for the clarification of their performance bottlenecks

Higashikawa

Inoue

et al. 2020

Supercond. Sci. Technol.

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This paper reports a diagnostic method for clarifying performance bottlenecks in superconducting wires and tapes for their further performance enhancements. In particular, our achievements by scanning Hall-probe microscopy (SHPM), which worked well for selecting positions for microstructure observation by SEM, TEM, and x-ray CT, are introduced. This hybrid microscopy offers the information of the direct relationship between the performance of a practical-scale superconducting wire or tape and its origin in micro-scale or nano-scale structure. As such examples, characterization results for an MgB 2 multi-filamentary wire, a commercially available long RE-123 coated conductor, and a striated multi-filamentary coated conductor are reported in this paper through reviewing our past studies.

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“…Indeed, a major issue of REBCO wires is the inhomogeneity of their performances along the length. Performance variation occurs even at very small scale [29]. Influence of small-scale defects on global critical current regarding to stabilizer thickness needs to be investigated further.…”

Section: Protectionmentioning

confidence: 99%

Superconducting magnetic energy storage and superconducting self-supplied electromagnetic launcher

Cicéron

Badel

Tixador

2017

Eur. Phys. J. Appl. Phys.

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Abstract. Superconductors can be used to build energy storage systems called Superconducting Magnetic Energy Storage (SMES), which are promising as inductive pulse power source and suitable for powering electromagnetic launchers. The second generation of high critical temperature superconductors is called coated conductors or REBCO (Rare Earth Barium Copper Oxide) tapes. Their current carrying capability in high magnetic field and their thermal stability are expanding the SMES application field. The BOSSE (Bobine Supraconductrice pour le Stockage d'Energie) project aims to develop and to master the use of these superconducting tapes through two prototypes. The first one is a SMES with high energy density. Thanks to the performances of REBCO tapes, the volume energy and specific energy of existing SMES systems can be surpassed. A study has been undertaken to make the best use of the REBCO tapes and to determine the most adapted topology in order to reach our objective, which is to beat the world record of mass energy density for a superconducting coil. This objective is conflicting with the classical strategies of superconducting coil protection. A different protection approach is proposed. The second prototype of the BOSSE project is a small-scale demonstrator of a Superconducting Self-Supplied Electromagnetic Launcher (S3EL), in which a SMES is integrated around the launcher which benefits from the generated magnetic field to increase the thrust applied to the projectile. The S3EL principle and its design are presented. Motivation SMES principle [1]Superconductors have the property to lose their electrical resistivity when they are cooled under a critical temperature T C . Even if energy dissipation occurs in a superconductor submitted to variable electrical current or magnetic induction (B), there is no energy dissipation in a steady state. If a superconducting winding is supplied, then short-circuited current is not dissipated by Joule effect and magnetic energy is conserved almost indefinitely. This is the principle of inductive storage with superconductors, generally called SMES (Superconducting Magnetic Energy Storage).The stored energy E mag can be expressed as a function of inductance L and current I or as the integral over space of the product of magnetic field H by induction B, following (1):Once the SMES has been charged and short-circuited, the energy is available and can be used by opening the short circuit and connecting the SMES to a load. It can be connected to the load either directly as in the case of direct supply of an electromagnetic launcher, or through a voltage adaptation system if the discharge has to be controlled. SMES have low energy density compared to batteries, but high power densities. Furthermore, they can have high cycling yield (97%), with the cycling yield being defined as the recovered energy divided by the energy provided to the SMES, including the energy spent to cool the system, after one cycle. They are direct electricity storage devices such as capacitors. Nevertheless, ...

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Nondestructive Diagnostics of Narrow Coated Conductors for Electric Power Applications

Cited by 20 publications

References 12 publications

Impact of critical current fluctuations on the performance of a coated conductor tape

Impact of critical current fluctuations on the performance of a coated conductor tape

Scanning Hall-probe microscopy for site-specific observation of microstructure in superconducting wires and tapes for the clarification of their performance bottlenecks

Superconducting magnetic energy storage and superconducting self-supplied electromagnetic launcher

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