Progress in scale-up of second-generation HTS conductor

Selvamanickam, V.; Chen, Y.; Xiong, X.; Xie, Yiyuan; Zhang, X.; Qiao, Ying; Reeves, J.; Rar, A.; Schmidt, Robert M.; Lenseth, K.

doi:10.1016/j.physc.2007.04.236

Cited by 68 publications

(43 citation statements)

References 6 publications

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“…The fabrication of the superconducting films was one of the important technologies in the productive process of the second-generation HTS strips [2]. Generally, HTS strips were prepared using Rolling-Assisted Biaxially Textured Substrates (RABiTS) technique and Ion-Beam Assisted Deposition (IBAD) technique.…”

Section: Introductionmentioning

confidence: 99%

Influence of CeO2-Cap Layer on the Texture and Critical Current Density of YBCO Film

Liu

Wang

et al. 2011

J Supercond Nov Magn

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YBa 2 Cu 3 O 7 (YBCO) thin films have been fabricated on different textured CeO 2 -cap layers by pulsed laser deposition (PLD). The texture and critical current density J c of YBCO thin films have been systematically investigated. Both in-plane and out-of-plane textures of YBCO films and CeO 2 -cap films were characterized by X-ray diffraction (XRD). And the critical currents of YBCO films were measured by the conventional four-probe method. It was found that the texture and J c of YBCO films were largely dependent on the texture of CeO 2 -cap layers under the optimized deposition conditions. With increasing the degree of in-plane and out-of-plane texture of CeO 2 -cap layers, J c of YBCO films decreased from 4.23 × 10 6 A/cm 2 to 0.47 × 10 6 A/cm 2 . The FWHM values of the omega scan rocking curves of YBCO films decreased from 3.71 to 1.84°a nd the phi scan rocking curves from 6.68 to 4.91°with improvement of CeO 2 -cap layer texture. Our results indicated that the fabrication of high texture quality of CeO 2 -cap layer was necessary for the epitaxial growth of high-J c YBCO films. The high-quality YBCO films which are comparable with those grown on single crystal substrates could be achieved on high textured CeO 2 -cap layers buffered metal substrates.

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Section: Introductionmentioning

confidence: 99%

Influence of CeO2-Cap Layer on the Texture and Critical Current Density of YBCO Film

Liu

Wang

et al. 2011

J Supercond Nov Magn

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“…4 Until recently, HTS shields have been made out of bulk materials. 5,[8][9][10] The significant progress in manufacturing the second generation ͑2G͒ coated conductors 11,12 has opened a possibility that they can be used as a material for magnetic screens. A recent study 13 reported the use of YBCO coated conductors to attenuate ac magnetic fields at low frequencies ͑10-100 Hz͒.…”

Section: Introductionmentioning

confidence: 99%

Use of second generation coated conductors for efficient shielding of dc magnetic fields

Fagnard

Dirickx

Levin

et al. 2010

Journal of Applied Physics

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This paper reports the results of an experimental investigation of the performance of two types of magnetic screens assembled from YBa 2 Cu 3 O 7−␦ ͑YBCO͒ coated conductors. Since effective screening of the axial dc magnetic field requires the unimpeded flow of an azimuthal persistent current, we demonstrate a configuration of a screening shell made out of standard YBCO coated conductor capable to accomplish that. The screen allows the persistent current to flow in the predominantly azimuthal direction at a temperature of 77 K. The persistent screen, incorporating a single layer of superconducting film, can attenuate an external magnetic field of up to 5 mT by more than an order of magnitude. For comparison purposes, another type of screen which incorporates low critical temperature quasipersistent joints was also built. The shielding technique we describe here appears to be especially promising for the realization of large scale high-T c superconducting screens.

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“…This not only reduces the cost of manufacturing for the conductor but increases substantially the engineering current density. At a critical current of J c = 200-300 A / cm width 8,14 and a substrate with a thickness of D =50 m, the engineering current density can reach J E = J c / D = 40-60 kA/ cm 2 . Thus, the coated conductors can be superior to the bulk YBCO option in many potential applications, providing a comparable engineering current density with superior uniformity and consistency, especially for large size pieces.…”

Section: Rmentioning

confidence: 99%

“…The relaxation rate is sufficiently low for the coated conductors to potentially be used to form large persistent coils operating at or near liquid nitrogen temperature for a range of applications: from persistent magnets for magnetic resonance imaging machines to electric motors and superconducting bearings, 5,6 where they can replace bulk YBCO, to more exotic applications such as magnetic shields needed to protect the crew from radiation on long-duration missions to Mars and on a lunar base. 7 Several individual 12ϫ 150 mm 2 sections of coated conductors with a nominal critical current 170 A, produced by SuperPower Inc., 8 were used in this study. There was no copper stabilizer attached; only a 1 -3 m thick silver coating covered YBCO film deposited on 100 m thick Hastelloy substrate.…”

Section: Introductionmentioning

confidence: 99%

Persistent current in coils made out of second generation high temperature superconductor wire.

Levin

Barnes

Murphy

et al. 2008

Applied Physics Letters

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We report the results of an experimental study of a persistent coil made out of YBa2Cu3O7−δ coated conductors. The magnitude of the persistent current and the rate of decay were investigated. Two distinct modes of relaxation are evident—one is flux creep and the other, which is much faster, is of less obvious origin. Our conclusion is that the persistent current in such a coil can be large enough and decay slowly enough so that coated conductors can be used to make persistent coils for variety of applications.

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Progress in scale-up of second-generation HTS conductor

Cited by 68 publications

References 6 publications

Influence of CeO2-Cap Layer on the Texture and Critical Current Density of YBCO Film

Influence of CeO2-Cap Layer on the Texture and Critical Current Density of YBCO Film

Use of second generation coated conductors for efficient shielding of dc magnetic fields

Persistent current in coils made out of second generation high temperature superconductor wire.

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