Construction and Operation of Cryogen Free ${\hbox{MgB}}_{2}$ Magnets for Open MRI Systems

Razeti, M.; Angius, Silvano; Bertora, Leonardo; Damiani, D.; Marabotto, R.; Modica, M.; Nardelli, Davide; Perrella, Michele; Tassisto, M.

doi:10.1109/tasc.2008.920661

Cited by 83 publications

(46 citation statements)

References 5 publications

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“…However, these systems play a considerable role when considering HTS MRI magnet systems. The reader can find details about those systems in the following references (Lvovsky and Jarvis 2005;Ackermann et al 1999;Razeti et al 2008). …”

Section: Split Coil Open Approachmentioning

confidence: 99%

“…Cryogen-free cryostats in which all heat loads are removed by a cryocooler have been an important field for developments since the middle of 1990 (Steinmeyer et al 2002;Ackermann et al 1999;Razeti et al 2008;Laskaris et al 1995). However, cryostats using multiple cryogens also are a progressing field especially when looking at HTS (Stautner et al 2009).…”

Section: Cryostat Designmentioning

confidence: 99%

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High-Field Superconducting Magnets

Liebel

2011

Medical Radiology

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Section: Split Coil Open Approachmentioning

confidence: 99%

Section: Cryostat Designmentioning

confidence: 99%

High-Field Superconducting Magnets

Liebel

2011

Medical Radiology

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“…In addition, its transition temperature of 39 K allows it to operate at higher temperatures up to 25 K [3][4][5][6]. Owing to these benefits [7,8], there have been many recent reports on MgB 2 -conductor-based MRI magnets [9][10][11][12][13][14]. In fact, PARAmed has already commercialized LHe-free MRI systems, called as "open sky MRI".…”

Section: Introductionmentioning

confidence: 99%

MgB₂superconducting joints for persistent current operation

Patel

Hossain

See

et al. 2015

Supercond. Sci. Technol.

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High-performance superconducting joints are essential for realizing persistent-mode magnets. Herein, we propose a concept and fabrication of such superconducting joints, which yielded reliable performance in the operating temperature range of 4.2-25 K. MgB 2 -MgB 2 joints in magnets are known to result in deterioration of localized electrical, thermal, and mechanical properties. To overcome these problems, the ends of the two wires are inserted into a pellet press, which is then filled with a mixture of unreacted magnesium and boron powders, followed by heat treatment. The critical current capacity and joint resistance were precisely evaluated by the standard four-probe method in open-circuit and by field-decay measurements in a closed-loop, respectively. These joints demonstrated up to 66% of the current-carrying capacity of unjoined wire at 20 K, 2 T and joint resistance of 1.4 x 10 −12 Ω at 4.2 K in self-field. AbstractHigh-performance superconducting joints are essential for realizing persistent-mode magnets.Herein, we propose a new process and fabrication of such superconducting joints, which yielded reliable performance in the operating temperature range of 4.2 K to 25 K. MgB 2 -MgB 2 joints in magnets, are known to result in deterioration of localized electrical, thermal, and mechanical properties. To overcome these problems, the ends of the two wires are inserted into a pellet press, which is then filled with a mixture of unreacted magnesium and boron powders, followed by heat treatment. The critical current capacity and joint resistance were precisely evaluated by the standard four-probe method in open-circuit and by fielddecay measurements in a closed-loop, respectively. These joints demonstrated up to 66% of the current-carrying capacity of unjoined wire at 20 K, 2 T and joint resistance of < 1.4 x 10 -12 Ω at 4.2 K in self-field.

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“…In recent years, with rapidly increasing costs and possible future shortage of liquid helium, several approaches to superconducting NMR magnets with no liquid helium have been proposed [7][8][9][10][11]. These include high critical temperature superconductors (HTSs) such as Y-Ba-Cu-O [7,8],…”

Section: Introductionmentioning

confidence: 99%

“…Bi-Sr-Ca-Cu-O [9], and MgB 2 [10]. The magnets made of HTS materials can be divided into wire and bulk magnets.…”

Section: Introductionmentioning

confidence: 99%

Development of a superconducting bulk magnet for NMR and MRI

Nakamura

Tamada

Yanagi³

et al. 2015

Journal of Magnetic Resonance

111

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A superconducting bulk magnet composed of six vertically stacked annular single-domain c-axis-oriented Eu-Ba-Cu-O crystals was energized to 4.74 T using a conventional superconducting magnet for high-resolution NMR spectroscopy. Shim coils, gradient coils, and radio frequency coils for high resolution NMR and MRI were installed in the 23 mm-diameter room-temperature bore of the bulk magnet. A 6.9 ppm peak-to-peak homogeneous region suitable for MRI was achieved in the central cylindrical region (6.2 mm diameter, 9.1 mm length) of the bulk magnet by using a single layer shim coil. A 21 Hz spectral resolution that can be used for high resolution NMR spectroscopy was obtained in the central cylindrical region (1.3 mm diameter, 4 mm length) of the bulk magnet by using a multichannel shim coil. A clear 3D MR image dataset of a chemically fixed mouse fetus with (50 μm)(3) voxel resolution was obtained in 5.5 h. We therefore concluded that the cryogen-free superconducting bulk magnet developed in this study is useful for high-resolution desktop NMR, MRI and mobile NMR device.

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Construction and Operation of Cryogen Free ${\hbox{MgB}}_{2}$ Magnets for Open MRI Systems

Cited by 83 publications

References 5 publications

High-Field Superconducting Magnets

High-Field Superconducting Magnets

MgB₂superconducting joints for persistent current operation

Development of a superconducting bulk magnet for NMR and MRI

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Construction and Operation of Cryogen Free ${\hbox{MgB}}_{2}$ Magnets for Open MRI Systems

Cited by 83 publications

References 5 publications

High-Field Superconducting Magnets

High-Field Superconducting Magnets

MgB2superconducting joints for persistent current operation

Development of a superconducting bulk magnet for NMR and MRI

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MgB₂superconducting joints for persistent current operation