Limits of NbTi and ${\rm Nb}_{3}{\rm Sn}$, and Development of W&amp;R Bi–2212 High Field Accelerator Magnets

Godeke, A.; Cheng, D.; Dietderich, D.R.; Ferracin, P.; Prestemon, S.; Sabbi, G.; Scanlan, R.M.

doi:10.1109/tasc.2007.898447

Cited by 63 publications

(55 citation statements)

References 16 publications

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“…The average grain sizes between 100 to 200 nm for optimized reactions are one order of magnitude above the vortex spacing at application magnetic fields, which results in up to 50% loss in the maximum pin ning force [22] and a collective pinning of vortex bundles. The latter causes the maximum pinning force to occur at only 20% of H C 2 [32] as opposed to 50% of H& as is achieved in NbTi through the inclusion of a Ti precipitates [30,31]. Further op timization through grain refinement is therefore desirable.…”

Section: Exemplary Cross-section Morphology and Compositionmentioning

confidence: 99%

“…The potential benefits of matching the spacing of the pinning sites to the vortex spacing can be estimated to be a 50% increase in the maximum pinning force [22], combined with an approximate 40% increase in pinning efficiency at 50% of H* 2 (i.e. around 15 T) [19,31,32]. An additional benefit of grain refinement is that it will increase scattering and thus the normal state resistivity, which in turn has the potential to further enhance H C 2 if the mean free path is not too severely reduced [68,69].…”

Section: Successful Applications Using Pit Wiresmentioning

confidence: 99%

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State of the art powder-in-tube niobium–tin superconductors

et al. 2008

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Powder-in-Tube (PIT) processed Niobium-Tin wires are commercially manufactured for nearly three decades and have demonstrated a combination of very high current density (presently up to 2500 Amm -2 non-Cu at 12 T and 4.2 K) with fine (35 /im), well separated filaments. We review the developments that have led to the present state of the art PIT Niobium-Tin wires, discuss the wire manufacturing and A15 formation processes, and describe typical superconducting performance in relation to magnetic field and strain. We further highlight successful applications of PIT wires and conclude with an outlook on possibilities for further improvements in the performance of PIT Niobium-Tin wires.

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Section: Exemplary Cross-section Morphology and Compositionmentioning

confidence: 99%

Section: Successful Applications Using Pit Wiresmentioning

confidence: 99%

State of the art powder-in-tube niobium–tin superconductors

et al. 2008

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“…Two double-layer racetrack coils, YC01 and YC02, were wound on stainless steel 304 pole-islands following the subscale coil concept [5], [10], [12]. The pole-islands are 190 mm long, 37 mm wide and 9 mm thick.…”

Section: A Coil Fabricationmentioning

confidence: 99%

“…At Lawrence Berkeley National Laboratory (LBNL), highfield magnet inserts based on both Bi-2212 Rutherford cables [5], [10], [11] and YBCO tape conductors are under investigation through a subscale coil program similar to the one developed for Nb 3 Sn [12]- [14]. In this article, we summarize the results of recent efforts on YBCO coil technology development at LBNL.…”

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confidence: 99%

Measurements on Subscale Y-Ba-Cu-O Racetrack Coils at 77 K and Self-Field

Wang

Caspi

Cheng

et al. 2010

IEEE Trans. Appl. Supercond.

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Abstract-YBa2Cu3O 7−δ (YBCO) tapes carry significant amount of current at fields beyond the limit of Nb-based conductors. This makes the YBCO tapes a possible conductor candidate for insert magnets to increase the bore field of Nb3Sn highfield dipoles. As an initial step of the YBCO insert technology development, two subscale racetrack coils were wound using Kapton-insulated commercial YBCO tapes. Both coils had two layers; one had 3 turns in each layer and the other 10 turns. The coils were supported by G10 side rails and waxed strips and not impregnated. The critical current of the coils was measured at 77 K and self-field. A 2D model considering the magneticfield dependence of the critical current was used to estimate the expected critical current. The measured results show that both coils reached 80%-95% of the expected values, indicating the feasibility of the design concept and fabrication process.

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“…Due to the complex reaction process, coil fabrication may be limited to the react-and-wind process. However, there is one HEP program beginning investigations into the fabrication of small coils using wind-and-react and others following soon 5) .…”

Section: Htsmentioning

confidence: 99%

Challenges and Prospects for the Large Scale Application of Superconductivity in High Energy Physics and Fusion Programs

Gourlay

2007

TEION KOGAKU

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Synopsis:The large scale use of superconductivity continues to be dominated by applications for which there is generally no conventional option. In these cases, superconductivity has enabled new science and technology that could not exist without it. Thanks to persistent ongoing research, new ancillary technology and the development of new materials, the field is far from exhausted. The fields of fusion energy and high energy physics (HEP) have particularly benefited from the application of superconductivity. High magnetic fields are absolutely necessary to achieve the required performance parameters. Even though superconductivity is an enabling technology for these fields, it comes with a number of challenges. The progress in development of applications is driven from one side by the available materials and on the other, by the evolution, or sometimes revolution, in ancillary technologies. Technology for use in both fusion and accelerator magnets begins with the same materials and inherent constraints, yet results in substantially different configurations and unique challenges due to the operational requirements for the respective applications. This paper presents a comparison of the technology developed by the fusion and high energy physics programs, both the similarities and the differences, and prospects for future development.

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Limits of NbTi and ${\rm Nb}_{3}{\rm Sn}$, and Development of W&R Bi–2212 High Field Accelerator Magnets

Cited by 63 publications

References 16 publications

State of the art powder-in-tube niobium–tin superconductors

State of the art powder-in-tube niobium–tin superconductors

Measurements on Subscale Y-Ba-Cu-O Racetrack Coils at 77 K and Self-Field

Challenges and Prospects for the Large Scale Application of Superconductivity in High Energy Physics and Fusion Programs

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