Progress in Performance Improvement and New Research Areas for Cost Reduction of 2G HTS Wires

Selvamanickam, V.; Chen, Y; Kesgin, Ibrahim; Guevara, A; Shi, Tiezhu; Yao, Yan; Qiao, Yunfei; Zhang, Y.; Majkic, Goran; Carota, G; Rar, A.; Xie, Yiyuan; Dackow, J; Maiorov, B.; Civale, L.; Braccini, V.; Jaroszyński, J.; Xu, Aihua; Larbalestier, D. C.; Bhattacharya, R. N.

doi:10.1109/tasc.2011.2107310

Cited by 87 publications

(54 citation statements)

References 13 publications

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“…In figure 1 the angular dependences of I c at T = 77 K, B = 1 T are compared for RE123 tapes fabricated by MOCVD with and without BZO inclusions [40]. BZO leads to a twofold enhancement of I c in the orientation of B perpendicular to the tape surface (at angles around 180°in figure1).…”

Section: Reactive Co-evaporation (Rce)mentioning

confidence: 99%

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Senatore

Alessandrini

Lucarelli

et al. 2014

Supercond. Sci. Technol.

239

136

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Recent progresses in the second generation REBa 2 Cu 3 O 7 − x (RE123) coated conductor (CC) have paved a way for the development of superconducting solenoids capable of generating fields well above 23.5 T, i.e. the limit of NbTi−Nb 3 Sn-based magnets. However, the RE123 magnet still poses several fundamental and engineering challenges. In this work we review the state-ofthe-art of conductor and magnet technologies. The goal is to illustrate a close synergetic relationship between evolution of high-field magnets and advancement in superconductor technology. The paper is organized in three parts: (1) the basics of RE123 CC fabrication technique, including latest developments to improve conductor performance and production throughput; (2) critical issues and innovative design concepts for the RE123-based magnet; and (3) an overview of noteworthy ongoing magnet projects.

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Section: Reactive Co-evaporation (Rce)mentioning

confidence: 99%

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Senatore

Alessandrini

Lucarelli

et al. 2014

Supercond. Sci. Technol.

239

136

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“…A chemical solution deposition technique was applied to generate a dense array of BZO nanodots randomly oriented and distributed within the YBCO matrix, leading to a quasi-isotropic strong vortex-pinning landscape [4]. Later on, the scalable and economically viable technique of metal-organic chemical vapour deposition (MOCVD) has been successfully employed to fabricate REBCO tapes with enhanced pinning performance through the formation of columnar stacks of BZO nanodots [5][6][7]. However, the measurements described in the literature were almost all performed at relatively high temperatures, about or slightly below liquid nitrogen temperature.…”

Section: Introductionmentioning

confidence: 99%

Properties of recent IBAD–MOCVD coated conductors relevant to their high field, low temperature magnet use

Braccini

Jaroszyński

et al. 2010

Supercond. Sci. Technol.

104

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BaZrO 3 (BZO) nanorods are now incorporated into production IBAD-MOCVD coated conductors. Here we compare several examples of both BZO-free and BZO-containing coated conductors using critical current (I c ) characterizations at 4.2 K over their full angular range up to fields of 31 T. We find that BZO nanorods do not produce any c-axis distortion of the critical current density J c () curve at 4.2 K at any field, but also that pinning is nevertheless strongly enhanced compared to the non-BZO conductors. We also find that the tendency of the ab-plane J c () peak to become cusp-like is moderated by BZO and we define a new figure of merit that may be helpful for magnet design -the OADI (Off-Axis Double I c ), which clearly shows that BZO broadens the abplane peak and thus raises J c 5-30° away from the tape plane, where the most critical approach to I c occurs in many coil designs. We describe some experimental procedures that may make critical current I c tests of these very high current tapes more tractable at 4.2 K, where I c exceeds 1000 A even for 4 mm wide tape with only 1 m thickness of superconductor. A positive conclusion is that BZO is very beneficial for the J c characteristics at 4.2 K, just as it is at higher temperatures, where the correlated c-axis pinning effects of the nanorods are much more obvious.

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“…Even grain boundaries with as small as 41 misalignment act as weak links, exponentially degrading the critical current with increasing angle. 145 Recently, bulk transport measurements have shown that Zr doping improves critical current in field, 140 but microscopic mechanisms have not been investigated at the single vortex level.…”

Section: Chemical Disorder and Vortex Pinningmentioning

confidence: 99%

Interplay of chemical disorder and electronic inhomogeneity in unconventional superconductors

Zeljkovic

Hoffman

2013

Phys. Chem. Chem. Phys.

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Many of today's forefront materials, such as high-T c superconductors, doped semiconductors, and colossal magnetoresistance materials, are structurally, chemically and/or electronically inhomogeneous at the nanoscale. Although inhomogeneity can degrade the utility of some materials, defects can also be advantageous. Quite generally, defects can serve as nanoscale probes and facilitate quasiparticle scattering used to extract otherwise inaccessible electronic properties. In superconductors, nonstoichiometric dopants are typically necessary to achieve a high transition temperature, while both structural and chemical defects are used to pin vortices and increase critical current. Scanning tunneling microscopy (STM) has proven to be an ideal technique for studying these processes at the atomic scale.In this perspective, we present an overview of STM studies on chemical disorder in unconventional superconductors, and discuss how dopants, impurities and adatoms may be used to probe, pin or enhance the intrinsic electronic properties of these materials.

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Progress in Performance Improvement and New Research Areas for Cost Reduction of 2G HTS Wires

Cited by 87 publications

References 13 publications

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Properties of recent IBAD–MOCVD coated conductors relevant to their high field, low temperature magnet use

Interplay of chemical disorder and electronic inhomogeneity in unconventional superconductors

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