Examination and Analysis of Critical Current Uniformity of Long HTS Tapes by the MCorder

Zou, Songbing; Gu, Chen; Qu, Timing; Chen, Siwei; Li, Xiaohang; Han, Z.

doi:10.1109/tasc.2014.2374418

Cited by 9 publications

(3 citation statements)

References 14 publications

(16 reference statements)

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“…The heat treatment method demonstrated effectiveness in controlling critical current in both 77 K and 4.2 K conditions. The continuous 77 K I c measurement was conducted on a Mcoder device [46]. Each long-tape sample was scanned twice for distinguishing the system noise from the actual I c results.…”

Section: Heat Treatment Procedures and Ic Degradationmentioning

confidence: 99%

Experimental study on screening-current induced strain in REBCO insert coils: under critical current control and operation current cycles

Shao,

Zhang,

Xin

et al. 2024

Supercond. Sci. Technol.

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The screening-current effect is an inhomogeneous distribution of current density inside the REBCO conductors. The additional strain induced by the screening current, known as screening-current induced strain (SCS), is considered to affect the structural integrity of REBCO windings, especially when operating high-field REBCO insert magnets. In this work, we wound and tested a series of 50-turn REBCO coils inside a 10 T LTS external to investigate the influencing mechanism of multiple electromagnetic factors on SCS. We varied the critical current in different coils by different heat treatment procedures. Each coil was tested individually, experiencing a external field cycle and multiple operation current cycles at constant external fields. The extreme scenario for each coil was being energized to 400 A while the external field was 10 T. We adapted the discrete-coupled model to estimate the hoop strain distribution, monitored the experimental results by multiple strain gauges at the outermost turn. Test coil with a lower critical current endured a lower maximum hoop strain. When we were energizing the test coils, hoop strain increased at the edge of REBCO tapes while remaining nearly constant in the middle region. Additionally, the maximum hoop strain at the outermost turn decreased after each excitation cycle. This work could be an experimental reference for optimizing the electromagnetic design and the excitation scheme during the development of high-field REBCO magnets.

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Section: Heat Treatment Procedures and Ic Degradationmentioning

confidence: 99%

Experimental study on screening-current induced strain in REBCO insert coils: under critical current control and operation current cycles

Shao,

Zhang,

Xin

et al. 2024

Supercond. Sci. Technol.

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“…Recently, REBa 2 Cu 3 O y (REBCO) has been expected as the next-generation material for MRI because it can be made superconductive by liquid N due to its high T c , beyond 90 K. [2][3][4][5][6][7] However, REBCO has not been practically available in MRI yet, because it is difficult to fabricate long REBCO-coated conductors (REBCO CCs) with homogeneous critical current (I c ). 8,9) While the length of NbTi wires could reach 10-15 km and 40-50 km for 0.5 T and 2.0 T magnets, respectively, the longest REBCO CCs with homogeneous I c reported so far are approximately 1 km, even in optimum fabrication conditions. 3,10,11) Several joint methods have been developed to lengthen REBCO CCs, such as use of a solder joint, 12,13) a diffusion joint using a metal stabilizer, [14][15][16] and a superconducting joint.…”

mentioning

confidence: 98%

Microstructures of superconducting joint between GdBa₂Cu₃O _y -coated conductors via additionally deposited precursor films

Miyajima

Teranishi

Yasuyama

et al. 2019

Jpn. J. Appl. Phys.

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Superconducting joints have been demanded to lengthen REBa 2 Cu 3 O y -coated conductors for electrical power applications. In this study, we propose a new joint method for GdBa 2 Cu 3 O y -coated conductors via crystallizing precursor films additionally deposited on the conductors. Two GdBa 2 Cu 3 O y -coated conductors with precursor films were placed in a face-to-face manner in a furnace, then they were crystallized under mechanical pressure to joint them. A superconducting joint was achieved with a high critical temperature of 90.8 K. Microstructural observation by a transmission electron microscope revealed that there were only a few pores at the joint boundary without a secondary phase having c-axisoriented GdBa 2 Cu 3 O y .

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“…A mong the many types of superconductors, REBa 2 Cu 3 O y (REBCO) has large advantages such as high critical temperature (T c ) above 90 K and high critical current density (J c ) over 1 MA cm −2 at 77 K. [1][2][3][4][5][6] A REBCO coated conductor (CC) has been expected to operate as a high magnetic field devices with high spatial resolution at low cost, such as magnetic resonance imaging and nuclear magnetic resonance. 7,8) Nevertheless, these devices with REBCO have not yet been commercialized due to the difficulty in fabricating long REBCO CCs while maintaining a high critical current (I c ).…”

mentioning

confidence: 99%

Influence of joint pressure on superconducting and mechanical properties for jointed GdBa₂Cu₃O_y coated conductors via precursor films

Miyajima

Teranishi

Yasuyama

et al. 2019

Jpn. J. Appl. Phys.

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There has been demand to lengthen superconducting joints of REBa 2 Cu 3 O y coated conductors to realize magnet applications. In this work, jointed samples of GdBa 2 Cu 3 O y coated conductors were prepared by crystallizing precursor films deposited by a pulsed laser deposition method under mechanical pressures, and influence of the pressures on superconducting and mechanical properties were investigated. While areal fraction and shearing stress of the joints were increased by increasing the pressure, superconducting properties were degraded. X-ray diffraction analysis indicated that the degradation was due to the formation of a secondary phase and decrease of oxygen contents in GdBa 2 Cu 3 O y .

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Examination and Analysis of Critical Current Uniformity of Long HTS Tapes by the MCorder

Cited by 9 publications

References 14 publications

Experimental study on screening-current induced strain in REBCO insert coils: under critical current control and operation current cycles

Experimental study on screening-current induced strain in REBCO insert coils: under critical current control and operation current cycles

Microstructures of superconducting joint between GdBa₂Cu₃O _y -coated conductors via additionally deposited precursor films

Influence of joint pressure on superconducting and mechanical properties for jointed GdBa₂Cu₃O_y coated conductors via precursor films

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Examination and Analysis of Critical Current Uniformity of Long HTS Tapes by the MCorder

Cited by 9 publications

References 14 publications

Experimental study on screening-current induced strain in REBCO insert coils: under critical current control and operation current cycles

Experimental study on screening-current induced strain in REBCO insert coils: under critical current control and operation current cycles

Microstructures of superconducting joint between GdBa2Cu3O y -coated conductors via additionally deposited precursor films

Influence of joint pressure on superconducting and mechanical properties for jointed GdBa2Cu3Oy coated conductors via precursor films

Contact Info

Product

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Microstructures of superconducting joint between GdBa₂Cu₃O _y -coated conductors via additionally deposited precursor films

Influence of joint pressure on superconducting and mechanical properties for jointed GdBa₂Cu₃O_y coated conductors via precursor films