Progress in&lt;tex&gt;$rm Bi$&lt;/tex&gt;-2212 Wires for High Magnetic Field Applications

Marken, K.R.; Miao, Hanping; Meinesz, M.; Czabaj, B.; Hong, Seung Pyo

doi:10.1109/tasc.2006.873262

Cited by 39 publications

(29 citation statements)

References 8 publications

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“…It was observed in our earlier experiments that after reaction many Bi-2212 coils exhibited some defects in the coil surface and amongst the internal windings [6,7]. The defects are often visually indicated by black spots.…”

Section: Wind-and-react Bi-2212 Coil Fabricationmentioning

confidence: 76%

“…We applied the "wind-and-react" process for Bi-2212/Ag coil fabrication, as reported in the prior works [6,7]. After winding, Bi-2212/Ag coils were heat treated in a furnace with flowing oxygen.…”

Section: Methodsmentioning

confidence: 99%

“…The coil was epoxy impregnated using procedures established for our 5 T Bi-2212 insert coil which reached 25 T [6], and then tested in background fields using the 20 T, 75 mm bore LTS magnet [16,19]. This coil generated additional 2.5T @4.2 K & 20 T background field.…”

Section: Wind-and-react Bi-2212 Coil Fabricationmentioning

confidence: 99%

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Development of Bi-2212 round wires for high field magnet applications

Miao¹,

Huang

Meinesz³

et al. 2012

AIP Conference Proceedings

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Section: Wind-and-react Bi-2212 Coil Fabricationmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

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Development of Bi-2212 round wires for high field magnet applications

Miao¹,

Huang

Meinesz³

et al. 2012

AIP Conference Proceedings

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“…Six independent tension controlled payoff spools can accommodate up to five internal layers in addition to the sheathing layer. This line was developed after detailed comparisons between sheathed p. 4 In parallel experiments with sheathed and bare tape, comparisons were made using continuous heat treatment and batch heat treatment. (Only continuous heat treatment is suitable for the bare tape.)…”

Section: Technical Results: Hts Mri Systemmentioning

confidence: 99%

Cost Effective Open Geometry HTS MRI System amended to BSCCO 2212 Wire for High Field Magnets

Marken¹

2006

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BackgroundThe original goal of this Phase II Superconductivity Partnership Initiative project was to build and operate a prototype Magnetic Resonance Imaging (MRI) system using HTS coils wound from continuously processed dip-coated BSCCO 2212 tape conductor. MRI is the largest existing commercial application of superconductors. In 1999 -2000 a business opportunity was perceived for competitively priced, superconducting MRI systems having an open architecture to allow patient comfort and easy access by medical personnel. At that time, open architecture MRI was the fastest growing segment of the market. Most open geometry systems of the time were not superconducting, because of the complex cryogenic systems needed for liquid helium cooling of low temperature superconducting (LTS) magnets, while still allowing open access to the high field region. However, superconducting systems offer distinct advantages in terms of field quality and field strength, and therefore obtainable image quality. Although the feasibility of making conduction cooled HTS MRI coils from multifilamentary BSCCO-2223 conductors had already been shown at that time, the price of the 2223 tape was (and remains) too high. However, BSCCO-2212 can be melt processed and thus can be made as an inexpensive slurry coated conductor, without the need for labor intensive powder-in-tube deformation processing.Cost estimates showed that dip-coated 2212 tape would have labor and materials costs that are between 10 and 25% of those for multifilamentary 2223 tape. In addition, capital costs are significantly lower. Thus there were compelling reasons to explore the possibility of using dip-coated tape. The melt processing of 2212, which is not feasible with 2223, is what makes the lower cost, coated conductor format a possibility; however, the technical methods for continuously melt processing long lengths needed to be established. One of this program's original aims was to verify that uniform properties, including current density, physical dimensions, and mechanical strength, could be achieved in long lengths of this tape.Using dip-coated tape, the plan was for MRI magnet coils to be wound to fit an established commercial open geometry, 0.2 Tesla permanent magnet system. New electronics and imaging software for a prototype higher field superconducting system would have added significantly to the cost. However, the use of the 0.2 T platform would allow the technical feasibility and the cost issues for HTS systems to be fully established. Also it would establish the energy efficiency and savings of HTS open MRI compared with resistive and permanent magnet systems. The commercial goal was an open geometry HTS MRI running at 0.5 T and 20 K.It was expected that success with this prototype system would lead to lower costs and increased performance for open geometry MRI. This progress was expected to result in a greatly expanded market for the low cost end of MRI applications. This could have very

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“…These conductors are highly anisotropic with respect to their electromagnetic properties, and geometrically well suited for magnetic field processing. Recently, however, the focus for Bi2212 R&D has shifted to round wire and low aspect ratio (1-2) geometries [20,21]. For reasons not yet fully understood, these conductors now show isotropic electromagnetic behavior and higher J e than the wide tape conductors.…”

Section: Introductionmentioning

confidence: 99%

On the influence of magnetic field processing on the texture, phase assemblage and properties of low aspect ratio Bi₂Sr₂CaCu₂O_x/AgMg wire

Liu

Schwartz

2009

Science and Technology of Advanced Materials

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Bi 2 Sr 2 CaCu 2 O x /AgMg conductors are potentially important for many applications up to 20 K, including magnets for cryogen-free magnetic resonance imaging and high field nuclear magnetic resonance research. One promising approach to increased critical current density is partial-melt processing in the presence of a magnetic field which has been shown to enhance c-axis texturing of wide, thin tape conductors. Here, we report on low aspect ratio rectangular conductors processed in an 8 T magnetic field. The magnetic field is applied during different stages of the heat treatment process. The conductors are electrically characterized using four-point critical current measurements as a function of magnetic field and magnetic field orientation relative to the conductor. The superconductive transition and magnetization hysteresis are measured using a SQUID magnetometer. The microstructures are characterized using scanning electron microscopy and energy dispersive spectroscopy and analyzed using digital image processing. It is found that the presence of a magnetic field during split melt processing enhances the electrical transport and magnetic behavior, but that the anisotropy is not consistently affected. The magnetic field also affects development of interfilamentary Bi2212 bridges, and that this depends on the initial shape of the Bi2212 filament. At least two behaviors are identified; one impacts the oxide phase assemblage and the other impacts textured growth.

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Progress in<tex>$rm Bi$</tex>-2212 Wires for High Magnetic Field Applications

Cited by 39 publications

References 8 publications

Development of Bi-2212 round wires for high field magnet applications

Development of Bi-2212 round wires for high field magnet applications

Cost Effective Open Geometry HTS MRI System amended to BSCCO 2212 Wire for High Field Magnets

On the influence of magnetic field processing on the texture, phase assemblage and properties of low aspect ratio Bi₂Sr₂CaCu₂O_x/AgMg wire

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Progress in<tex>$rm Bi$</tex>-2212 Wires for High Magnetic Field Applications

Cited by 39 publications

References 8 publications

Development of Bi-2212 round wires for high field magnet applications

Development of Bi-2212 round wires for high field magnet applications

Cost Effective Open Geometry HTS MRI System amended to BSCCO 2212 Wire for High Field Magnets

On the influence of magnetic field processing on the texture, phase assemblage and properties of low aspect ratio Bi2Sr2CaCu2Ox/AgMg wire

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On the influence of magnetic field processing on the texture, phase assemblage and properties of low aspect ratio Bi₂Sr₂CaCu₂O_x/AgMg wire