Development of a Cryogen Free 1.5 T YBCO HTS Magnet for MRI

Parkinson, Ben; Slade, Robert A.; Mallett, M. J. D.; Chamritski, V.

doi:10.1109/tasc.2012.2235893

Cited by 83 publications

(38 citation statements)

References 6 publications

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“…REBCO coated conductors have also been demonstrated in a magnet with an overall 42.5 T field generated by a 11.3 T REBCO insert coil in a 31.2 T background field 5 , a 26 T superconducting magnet 6 , and the concept design of a 100 T magnet 7 . Moreover, prototype coils for rotation machinery applications 8 , superconducting magnetic energy storage 9 , magnetic resonance imaging and nuclear magnetic resonance 10–12 , and high energy physics 13, 14 are being extensively investigated. A critical need for high field magnet R&D is the substantially increased performance and reduced cost, and aggressively pursuing the development of superconducting magnets 15 .…”

Section: Introductionmentioning

confidence: 99%

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

Zhang

Gharahcheshmeh

et al. 2017

Sci Rep

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A main challenge that significantly impedes REBa2Cu3Ox (RE = rare earth) coated conductor applications is the low engineering critical current density J e because of the low superconductor fill factor in a complicated layered structure that is crucial for REBa2Cu3Ox to carry supercurrent. Recently, we have successfully achieved engineering critical current density beyond 2.0 kA/mm2 at 4.2 K and 16 T, by growing thick REBa2Cu3Ox layer, from ∼1.0 μm up to ∼3.2 μm, as well as controlling the pinning microstructure. Such high engineering critical current density, the highest value ever observed so far, establishes the essential role of REBa2Cu3Ox coated conductors for very high field magnet applications. We attribute such excellent performance to the dense c-axis self-assembled BaZrO3 nanorods, the elimination of large misoriented grains, and the suppression of big second phase particles in this ~3.2 μm thick REBa2Cu3Ox film.

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Section: Introductionmentioning

confidence: 99%

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

Zhang

Gharahcheshmeh

et al. 2017

Sci Rep

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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%

“…Like low critical-temperature superconductors (LTSs) such as NbTi and Nb 3 Sn, tapes and wires of HTS materials have been developed for superconducting magnets [7][8][9][10][11]. However, because it is very difficult to make superconducting junctions using HTS materials, superconducting magnets using HTS wires or tapes need power sources.…”

Section: Introductionmentioning

confidence: 99%

Development of a superconducting bulk magnet for NMR and MRI

Nakamura

Tamada

Yanagi³

et al. 2015

Journal of Magnetic Resonance

112

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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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“…During the past several years, the basic mechanism for these problems has been investigated and effective partial remedies proposed [18]. However, REBCO coils are still at an early stage of development and very few REBCO magnet systems have been built [27]. Therefore, preliminary research has been conducted in our laboratory prior to magnet development and published elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Operation of a 400 MHz NMR magnet using a (RE:Rare Earth)Ba2Cu3O7− high-temperature superconducting coil: Towards an ultra-compact super-high field NMR spectrometer operated beyond 1 GHz

Yanagisawa

Piao

Iguchi

et al. 2014

Journal of Magnetic Resonance

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High-temperature superconductors (HTS) are the key technology to achieve super-high magnetic field nuclear magnetic resonance (NMR) spectrometers with an operating frequency far beyond 1GHz (23.5T). (RE)BaCuO (REBCO, RE: rare earth) conductors have an advantage over BiSrCaCuO (Bi-2223) and BiSrCaCuO (Bi-2212) conductors in that they have very high tensile strengths and tolerate strong electromagnetic hoop stress, thereby having the potential to act as an ultra-compact super-high field NMR magnet. As a first step, we developed the world's first NMR magnet comprising an inner REBCO coil and outer low-temperature superconducting (LTS) coils. The magnet was successfully charged without degradation and mainly operated at 400MHz (9.39T). Technical problems for the NMR magnet due to screening current in the REBCO coil were clarified and solved as follows: (i) A remarkable temporal drift of the central magnetic field was suppressed by a current sweep reversal method utilizing ∼10% of the peak current. (ii) A Z2 field error harmonic of the main coil cannot be compensated by an outer correction coil and therefore an additional ferromagnetic shim was used. (iii) Large tesseral harmonics emerged that could not be corrected by cryoshim coils. Due to those harmonics, the resolution and sensitivity of NMR spectra are ten-fold lower than those for a conventional LTS NMR magnet. As a result, a HSQC spectrum could be achieved for a protein sample, while a NOESY spectrum could not be obtained. An ultra-compact 1.2GHz NMR magnet could be realized if we effectively take advantage of REBCO conductors, although this will require further research to suppress the effect of the screening current.

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Development of a Cryogen Free 1.5 T YBCO HTS Magnet for MRI

Cited by 83 publications

References 6 publications

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor

Development of a superconducting bulk magnet for NMR and MRI

Operation of a 400 MHz NMR magnet using a (RE:Rare Earth)Ba2Cu3O7− high-temperature superconducting coil: Towards an ultra-compact super-high field NMR spectrometer operated beyond 1 GHz

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