Research data supporting “Spark-discharge Plasma as a Method to Produce Low AC Loss Multifilamentary (RE)Ba2Cu3O7 Coated Conductors”
T. B. Mitchell-WilliamsAlgirdas BaškysYina GuoSimon C. HopkinsU. BangertAlexander MolodykValery PetrykinF GömöryL FrolekB.A. Głowacki
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Data supporting the publication including: Hall probe magnetometry, scanning electron microscopy, critical current measurements and AC loss measurement raw data.Keywords:
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Impressive performance has been achieved in (RE)Ba 2 Cu 3 O 7-δ (REBCO) coated conductors, but for many applications, the high cost and ac losses remain prohibitive. Inkjet printing methods combine scalability and low equipment cost with high-resolution patterning, potentially addressing both issues by enabling the production of multifilamentary coated conductors without subtractive processing. The successful production of multifilamentary superconducting YBa 2 Cu 3 O 7-δ (YBCO) structures by inkjet printing of a low-fluorine YBCO precursor solution on SS/ABAD-YSZ/CZO substrates is reported. Two approaches have been developed. In the first method, YBCO filaments were directly deposited on the buffered substrate by piezoelectric printing; and in the second approach, CeO 2 tracks were first printed to pattern a subsequently overprinted YBCO film, creating a multifilamentary structure by an inverse technique. Scanning Hall probe measurements have been used to compare the filamentary structures and critical currents achieved by both methods, and a J c of up to 3 MA cm -2 has been obtained at 77 K. For the inverse printing approach, the ac hysteresis losses have been also measured and compared with theoretical models.
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For AC loss reduction in Bi2223 tapes subjected to an AC external magnetic field, twisting the superconducting filaments and/or introducing oxide layers as highly resistive barriers around each filament are required. However, the structure of barrier tape becomes very complex and longitudinal uniformity of both transport property and tape structure could be easily deteriorated. To improve the current transport capability and its longitudinal uniformity for barrier tape for AC use, simple and non-destructive techniques to characterize them should be indispensable. In this paper, we examined the self-field distributions for Bi2223 tapes with oxide barriers carrying DC transport current by a scanning Hall-probe microscopy (SHM). Non-twisted and twisted 19-filamentary tapes with SrZrO 3 +Bi2212 barriers were prepared by powder-in-tube process. The distributions of self-field in perpendicular to the broader face of a tape carrying DC current below critical current I c was measured at 77 K by SHM with an active area of 50 μm × 50 μm, at 0.5 mm away from the tape surface. Based on the measured self-field distributions, longitudinal non-uniformity of transport properties and the presence of local defects to obstruct the current transport in barrier tapes were investigated.
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To achieve low ac losses in applied ac fields, YBa 2 Cu 3 O x (YBCO) filaments were created on a RABiTS buffered substrate through solution inkjet deposition. A metal organic decomposition (MOD) solution was placed into an inkjet dispenser and filaments of widths of 100 mum and 0.8 mm were deposited on the substrate at a spacing of 50 to 100 mum. Each sample, which had a width of 1 cm and a nominal length of 4 cm, was placed in a perpendicular ac field and the ac losses were measured thermally as a function of the field strengths up to 100 mT and at frequencies between 60 Hz and 120 Hz. Samples with inkjet filaments had a high coupling loss. This coupling between filaments may extend along the entire sample length because removal of the conductor ends did not reduce the coupling loss contribution. Reduction in ac loss was observed in samples with laser-scribed filaments that were made from the same MOD solution.
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Rare earth-based coated conductors have large ac magnetization losses, which hinder their use in a variety of applications. A common way to reduce these losses is by striating the superconductor into narrow filaments by means of laser ablation. Practical superconductors also need a sufficiently thick copper stabilization. The best way of creating copper-stabilized filamentized coated conductors is still to be found. In this paper, the ac magnetization losses of differently prepared 12 mm wide coated conductors manufactured by SuperOx were measured. The samples differ in terms of thicknesses of copper stabilization (5 and 10 μm), number of filaments (from 10 to 60), and order for copper deposition (filaments produced before or after electroplating the tape). The ac loss measurements were performed at 77 K in a wide range of frequencies of the external magnetic field, which allows determining the onset of coupling currents and the importance of the coupling losses. Complementary dc measurements of the transverse resistivity between filaments help to understand the path of the coupling currents. Thanks to the variety of tested samples and operating conditions, this paper provides a direct comparison of the two striation processes in commercially available high-temperature superconductor coated conductors.
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REBa2Cu3Ox (REBCO, RE = rare earth) coated conductors (CCs) are expected to show high performance for superconducting coil applications due to their high tensile strength and high critical current density under magnetic fields. One of the most serious problems on the coil application is the significant screening current, which is caused by the configuration of CC. Since screening current is dependent on the width of the REBCO layer, filamentization of the REBCO layer is strongly desired. We have succeeded in fabricating long length four-divided multifilamentary CCs with 4 mm wide over 100 m long by using the process of scratching the IBAD-MgO layer (scratching process). In this work, we fabricated two epoxy-impregnated coils and investigated the effects of the screening current. One of the coils is wound with multifilamentary CCs fabricated by scratching process, another is wound with conventional mono-filamentary CC. As the results, it is confirmed that the screening current is reduced and the coupling current between the filaments might be in the acceptable range on the DC magnet application.
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We have carried out the characterization of local critical current distribution in a 113-m-long multifilamentary coated conductor (CC) based on reel-to-reel scanning Hall-probe microscopy. Patterning multifilamentary structure on CCs is a key technology for the reduction of ac losses due to magnetization. Recently, this advantage has also been expected for the reduction of the magnetization in a coil winding which has been recognized as a critical problem for HTS magnet applications such as accelerators, MRI, and NMR from the viewpoint of field homogeneity and temporal stability. However, it has been difficult for the conventional techniques such as four-probe method, TAPESTAR, etc., to make diagnostics for multifilamentary CCs due to the limitation of spatial resolution. On the other hand, our measurement has an advantage in taking two-dimensional field image. This enabled us to confirm that multifilamentary structure as well as the corresponding magnetization reduction was successfully achieved in a long-length CC. At the same time, by the estimation of local critical current distribution for each filament, it was also found that there were still some local defects, which affected the global performance of the multifilamentary CC, even if the probability density of such defects was only in the order of 10 -5 . These findings will become crucial information for the optimization of fabrication processes of multifilamentary CCs and for their nondestructive quality assurance.
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