Development of high superconductor fraction Bi2 Sr 2CaCu2Ox/Ag wire for MRI

W. T. Nachtrab; C. V. Renaud; T. Wong; X. T. Liu; T. M. Shen; U. P. Trociewitz; J. Schwartz

doi:10.1109/TASC.2008.920630

Development of high superconductor fraction Bi₂ Sr ₂CaCu₂O_x/Ag wire for MRI

W. T. Nachtrab, C. V. Renaud, T. Wong, X. T. Liu, T. M. Shen, U. P. Trociewitz, J. Schwartz

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

B12212 round multifilament wire has good potential for MRI systems designed to operate at 20 K and produce fields greater than 1.5 T. However, B12212 conductor is expensive largely due to the costs associated with materials and fabrication. To reduce the cost, we are investigating single restack designs. This approach reduces the silver fraction. It also reduces the amount of processing needed to make the conductor. However, a single restack limits the minimum filament diameter that can be achieved since the strain space is more limited. In this work we evaluated 4 conductor configurations to determine the effects of fill-factor, filament diameter, and s/d on J_e and n value. It was found that a reduction in filament size has a greater effect on J _e and n value than a corresponding increase in fill-factor. Some guidelines for optimization of conductor design are developed.

Original language	English (US)
Article number	4515943
Pages (from-to)	1184-1187
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	18
Issue number	2
DOIs	https://doi.org/10.1109/TASC.2008.920630
State	Published - Jun 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TASC.2008.920630

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title = "Development of high superconductor fraction Bi2 Sr 2CaCu2Ox/Ag wire for MRI",

abstract = "B12212 round multifilament wire has good potential for MRI systems designed to operate at 20 K and produce fields greater than 1.5 T. However, B12212 conductor is expensive largely due to the costs associated with materials and fabrication. To reduce the cost, we are investigating single restack designs. This approach reduces the silver fraction. It also reduces the amount of processing needed to make the conductor. However, a single restack limits the minimum filament diameter that can be achieved since the strain space is more limited. In this work we evaluated 4 conductor configurations to determine the effects of fill-factor, filament diameter, and s/d on Je and n value. It was found that a reduction in filament size has a greater effect on J e and n value than a corresponding increase in fill-factor. Some guidelines for optimization of conductor design are developed.",

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note = "Funding Information: Manuscript received August 25, 2007. This work was supported in part by the NIH-National Cancer Institute under Grant 4R44CA110117-03. W. T. Nachtrab, C. V. Renaud, Jr., and T. Wong are with Supercon, Inc., Shrewsbury, MA 01545 USA (e-mail: wnachtrab@supercon-wire.com). X. T. Liu, T. M. Shen, U. P. Trociewitz, and J. Schwartz are with the National High Magnetic Field Laboratory, Tallahassee, FL 32310 USA and the College of Engineering, FAMU-FSU, FL USA (e-mail: schwartz@magnet.fsu.edu). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2008.920630",

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Development of high superconductor fraction Bi₂ Sr ₂CaCu₂O_x/Ag wire for MRI

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