A Reel-to-Reel Scanning Hall Probe Microscope for Characterizing Long REBCO Conductor in Magnetic Fields Up to 5 Tesla

Li, Yang; Chen, S.; Paidpilli, Mahesh; Jain, Rohit; Goel, Chirag; Selvamanickam, V.

doi:10.1109/tasc.2022.3140688

Cited by 13 publications

(6 citation statements)

References 25 publications

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“…Such an approach disregards possible lateral distribution of the defects causing local I c reductions that has been revealed in magnetic mapping, optical scanning and Raman spectroscopy [9][10][11][12][13]. It is also clear that defects in different lateral positions could have different impacts on the Tapestar results and on the tape performance [14][15][16]. Nevertheless, in the experiments observing bubble creation in a nitrogen bath, it was found that the overheated zones appear in strips crossing the full width of the tape, probably because of current congestion around defects [17,18].…”

Section: Methodology Used For Analyzing the Datamentioning

confidence: 99%

Analysis of critical current fluctuations as a means of checking the quality of high-temperature superconductor tape slitting

Gömöry

Šouc

Godar

et al. 2023

Supercond. Sci. Technol.

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The patterns of longitudinal Ic fluctuations in the 12 mm wide production HTS tapes are compared with those obtained after slitting them to the widths of 6 mm, 4 mm and 3 mm, respectively. In the statistical analysis of Ic(x) data, the overall critical current, Ic,ovrl, was first calculated. In case of fluctuating critical current, Ic,ovr is lower than the average of critical current, Ic,aver. Also, the dissipation concentrates in the “weak spots” with reduced critical current. Simple model allows to estimate the thermal runaway current, Itr, at which the weakest location would convert to a “hot spot” with rapid increase of temperature. In the prediction of Itr, essential is the absolute minimum of Ic value, Icmin. Then, by comparing the Icmin/Ic,aver ratio in the slit tapes to that established previously for the manufactured tape, one can deduce if some new defects have been introduced during slitting. Interesting is also to check if the relation of Itr vs. Ic,ovrl remained without changing, because the lower of these two quantities represents the limit of transportable current. We have found a reduction of both Icmin/Ic,aver and Itr /Ic,ovrl ratios in some tapes, containing the edges of the original 12 mm production tape. Contrary to our expectations, the most serious drops in slit tapes were not in the same location as in the original tape. However, systematically better performance of the central strips (the tapes with both edges cut) is a strong indication that the most serious defects are created already during manufacturing, close to the tape edges. We conclude that the tape cutting by femtosecond laser has not introduced an additional non-uniformity. The analysis also shows that the criticality of defects in applications is largely governed by the width of said defect, the cooling conditions and the thickness of the stabilizing layer.

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Section: Methodology Used For Analyzing the Datamentioning

confidence: 99%

Analysis of critical current fluctuations as a means of checking the quality of high-temperature superconductor tape slitting

Gömöry

Šouc

Godar

et al. 2023

Supercond. Sci. Technol.

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“…SHM is well positioned to study these materials due to its quantitative nature, as well as its variable temperature operation from milli-Kelvin temperatures to well above the highest cuprate T c . By mapping the pinning of vortices to defect sites as well as quantitatively measuring the temperature dependent vortex profiles, SHM provides critical feedback for the optimisation of flux pinning [122,[147][148][149]. The miniaturisation of Hall probes down to the nanoscale using graphene will enable an expansion of this research by improving the correlation between vortices and nanoscale pinning sites.…”

Section: Current and Future Use Of The Technique For Materials Sciencementioning

confidence: 99%

2024 roadmap on magnetic microscopy techniques and their applications in materials science

Christensen,

Staub,

Devidas

et al. 2024

J. Phys. Mater.

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Considering the growing interest in magnetic materials for unconventional computing, data storage, and sensor applications, there is active research not only on material synthesis but also characterisation of their properties. In addition to structural and integral magnetic characterisations, imaging of magnetization patterns, current distributions and magnetic fields at nano- and microscale is of major importance to understand the material responses and qualify them for specific applications. In this roadmap, we aim to cover a broad portfolio of techniques to perform nano- and microscale magnetic imaging using SQUIDs, spin center and Hall effect magnetometries, scanning probe microscopies, x-ray- and electron-based methods as well as magnetooptics and nanoMRI. The roadmap is aimed as a single access point of information for experts in the field as well as the young generation of students outlining prospects of the development of magnetic imaging technologies for the upcoming decade with a focus on physics, materials science, and chemistry of planar, 3D and geometrically curved objects of different material classes including 2D materials, complex oxides, semi-metals, multiferroics, skyrmions, antiferromagnets, frustrated magnets, magnetic molecules/nanoparticles, ionic conductors, superconductors, spintronic and spinorbitronic materials.

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“…The critical current fits are reported in table 3. data is available for each tape [11,12], knowledge of the spatial distribution of local reductions in critical current density can be used to inform layering strategies. In this section, the network model is coupled with an optimization algorithm to recommend the optimal placement and orientation of tapes with defects within a cable.…”

Section: Optimal Defect Sortingmentioning

confidence: 99%

“…Research has been reported on performance degradation throughout the ReBCO life cycle. The field of individual tape characterization is mature, and high-throughput methods are available to measure the spatial variation of tape performance [11,12]. Several models have been developed to study the mechanics of tape cabling and bending [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of current distributions around defects in high temperature superconducting CORC^® cables

Teyber

Marchevsky

Martínez

et al. 2022

Supercond. Sci. Technol.

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High performance ReBCO magnet prototypes are typically monitored and protected with voltage measurements, however a variance in safe operating limits has been observed. A potential issue arises from current redistribution phenomena associated with unidentified defects in cables composed of ReBCO tapes. In this work, a network model is developed to simulate current and voltage distributions around defects in CORC cables. The evolving network of conductor overlap is evaluated. Trends in CORC operation at 77 K are presented, and it is shown that power dissipation in an I-V curve depends strongly on a third dimension of defect magnitude. The predictive tool is then coupled with a differential evolution algorithm to recommend optimal \CORC layering topologies based on reel-to-reel tape measurements. The developed model facilitates understanding of CORC cable phenomena, and the results suggest HTS magnet protection can be improved with cable and defect characterization efforts.

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A Reel-to-Reel Scanning Hall Probe Microscope for Characterizing Long REBCO Conductor in Magnetic Fields Up to 5 Tesla

Cited by 13 publications

References 25 publications

Analysis of critical current fluctuations as a means of checking the quality of high-temperature superconductor tape slitting

Analysis of critical current fluctuations as a means of checking the quality of high-temperature superconductor tape slitting

2024 roadmap on magnetic microscopy techniques and their applications in materials science

Numerical investigation of current distributions around defects in high temperature superconducting CORC^® cables

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A Reel-to-Reel Scanning Hall Probe Microscope for Characterizing Long REBCO Conductor in Magnetic Fields Up to 5 Tesla

Cited by 13 publications

References 25 publications

Analysis of critical current fluctuations as a means of checking the quality of high-temperature superconductor tape slitting

Analysis of critical current fluctuations as a means of checking the quality of high-temperature superconductor tape slitting

2024 roadmap on magnetic microscopy techniques and their applications in materials science

Numerical investigation of current distributions around defects in high temperature superconducting CORC® cables

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Product

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Numerical investigation of current distributions around defects in high temperature superconducting CORC^® cables