Manufacture and evaluation of Nb&amp;lt;inf&amp;gt;3&amp;lt;/inf&amp;gt;Sn conductors fabricated by the MJR method

McDonald, W.; Curtis, C. E.; Scanlan, R.M.; Larbalestier, D. C.; Marken, K.R.; Smathers, D.

doi:10.1109/tmag.1983.1062516

Cited by 43 publications

(9 citation statements)

References 2 publications

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“…Also during this time some variants of internal-tin strands were developed. One of them is the modified jelly roll (MJR) approach [39], in which a subelement is produced by rolling laminated Cu foil and expanded Nb mesh around a central Cu-clad Sn rod. Later distributed barriers were introduced to MJR wires so that each subelement had its own barrier against Sn leakage into the outer Cu matrix [40].…”

Section: Review Of Nb3sn Conductor Developmentmentioning

confidence: 99%

A review and prospects for Nb₃Sn superconductor development

2017

Supercond. Sci. Technol.

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Nb3Sn superconductors have significant applications in constructing high-field (> 10 T) magnets. This article briefly reviews development of Nb3Sn superconductor and proposes prospects for further improvement. It is shown that significant improvement of critical current density (Jc) is needed for future accelerator magnets. After a brief review of the development of Nb3Sn superconductors, the factors controlling Jc are summarized and correlated with their microstructure and chemistry. The non-matrix Jc of Nb3Sn conductors is mainly determined by three factors: the fraction of current-carrying Nb3Sn phase in the non-matrix area, the upper critical field Bc2, and the flux-line pinning capacity. Then prospects to improve the three factors are discussed respectively. An analytic model was developed to show how the ratios of precursors determine the phase fractions after heat treatment, based on which it is predicted that the limit of current-carrying Nb3Sn fraction in subelements is ~65%. Then, since Bc2 is largely determined by the Nb3Sn stoichiometry, a thermodynamic/kinetic theory was presented to show what essentially determines the Sn content of Nb3Sn conductors. This theory explains the influences of Sn sources and Ti addition on stoichiometry and growth rate of Nb3Sn layers. Next, to improve flux pinning, previous efforts in this community to introduce additional pinning centers (APC) to Nb3Sn wires are reviewed, and an internal oxidation technique is described.Finally, prospects for further improvement of non-matrix Jc of Nb3Sn conductors are discussed, 2 and it is seen that the only opportunity for further significantly improving Jc lies in improving the flux pinning.

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Section: Review Of Nb3sn Conductor Developmentmentioning

confidence: 99%

A review and prospects for Nb₃Sn superconductor development

2017

Supercond. Sci. Technol.

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“…To achieve a round wire based upon the textured ribbons fabricated using the Chilsonator, a modified jelly-roll conductor has been outlined [4] and follows closely the classical work of McDonald [10]. Such a conductor will take full advantage of the texture imparted by the roll processing method, while connectivity and densification will be achieved by the non-melt heat treatment reported elsewhere [5].…”

Section: Discussionmentioning

confidence: 99%

Fabrication and characterization of green-state Bi-2212 ribbons

Damborsky¹,

Lü²,

McInturff³

et al. 2012

AIP Conference Proceedings

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“…The cables (see Table I) are composed of 20 Nb 3 Sn strands with a diameter of 0.7 mm, and insulated with a 0.1 mm thick woven sleeve of fiberglass. The strands used in the cables of coil SC01 and SC02 were fabricated with the Modified Jelly Roll process [11], while the strands for the new coils were formed by the Restacked Rod Process [12].…”

Section: Magnetic Designmentioning

confidence: 99%

Development of a large aperture Nb/sub 3/Sn racetrack quadrupole magnet

Ferracin

Bartlett

Caspi

et al. 2005

IEEE Trans. Appl. Supercond.

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Abstract-The U.S. LHC Accelerator Research Program (LARP), a collaboration between BNL, FNAL, LBNL, and SLAC, has among its major objectives the development of advanced magnet technology for an LHC luminosity upgrade. The LBNL Superconducting Magnet Group supports this program with a broad effort involving design studies, Nb 3 Sn conductor development, mechanical models, and basic prototypes. This paper describes the development of a large aperture Nb 3 Sn racetrack quadrupole magnet using four racetrack coils from the LBNL Subscale Magnet (SM) Program. The magnet provides a gradient of 95 T/m in a 110 mm bore, with a peak field in the conductor of 11.2 T. The coils are pre-stressed by a mechanical structure based on a pre-tensioned aluminum shell, and axially supported with aluminum rods. The mechanical behavior has been monitored with strain gauges and the magnetic field has been measured. Results of the test are reported and analyzed.

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Manufacture and evaluation of Nb<inf>3</inf>Sn conductors fabricated by the MJR method

Cited by 43 publications

References 2 publications

A review and prospects for Nb₃Sn superconductor development

A review and prospects for Nb₃Sn superconductor development

Fabrication and characterization of green-state Bi-2212 ribbons

Development of a large aperture Nb/sub 3/Sn racetrack quadrupole magnet

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Manufacture and evaluation of Nb&lt;inf&gt;3&lt;/inf&gt;Sn conductors fabricated by the MJR method

Cited by 43 publications

References 2 publications

A review and prospects for Nb3Sn superconductor development

A review and prospects for Nb3Sn superconductor development

Fabrication and characterization of green-state Bi-2212 ribbons

Development of a large aperture Nb/sub 3/Sn racetrack quadrupole magnet

Contact Info

Product

Resources

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Manufacture and evaluation of Nb<inf>3</inf>Sn conductors fabricated by the MJR method

A review and prospects for Nb₃Sn superconductor development

A review and prospects for Nb₃Sn superconductor development