Test Coil for the Development of a Compact 3 T ${\rm MgB}_{2}$ Magnet

Mine, S.; Song, Honghai; Xu, Minfeng; Marte, J.S.; Buresh, Steve; Stautner, W.; Immer, Christopher; Laskaris, E.T.; Amm, Kathleen

doi:10.1109/tasc.2011.2175682

Cited by 21 publications

(14 citation statements)

References 6 publications

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“…4. Though these voltages were lower than Test coil 1's voltage (15 mV at 120 A and 20 K) [6], the voltages were not acceptable for magnet's persistent current operation. Test coil 3's n-value related voltage was quite similar to Test coil 2's.…”

Section: Ramping Results Of Test Coil 2 Andmentioning

confidence: 72%

“…Fig. 3 shows Test coil 2's ramping current coil voltage and temperatures at around 21 K. From this chart, n-value was calculated to be around 4 [6].…”

Section: Ramping Results Of Test Coil 2 Andmentioning

confidence: 99%

“…One test coil targeting for a 3 T magnet (Test coil 1) had been manufactured, tested, and reported already [6]. Though the manufacturing process and coil ramping performance seemed to have no problems, remnant voltage associated with low n-value was found when it was ramped to the designed current.…”

Section: Introductionmentioning

confidence: 99%

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Second Test Coil for the Development of a Compact 3 T $ \hbox{MgB}_{2}$ Magnet

Mine

Buresh

et al. 2013

IEEE Trans. Appl. Supercond.

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The authors have reported the results of low n-value from a MgB 2 test coil developed a year ago. A second test coil has been developed with wire of different structure and manufacturing process. Although the n-value related voltage of the second test coil was lower than the first test coil at designed current, it still showed low n-value. A third test coil has been wound with reduced mechanical stress. It also showed very similar n-value related voltage and n-value. Investigation of voltage distribution over the coil indicated that magnetic field was the major factor causing degradation of the n-value and resulting in n-value related voltages. Since the n-value related coil voltages were on the order of 0.1 μV/cm, the usual short sample I c test (1 μV/cm was the definition of I c ) might not detect the n-value related voltage and might not be able to investigate the cause of low n-value. Therefore, the medium length (∼10 m) samples were tested and they showed the wire's lengthwise nonuniformity both on n-value and I c , which might be another potential cause of the low n-value of the coil. Along with the electrical investigation, the manufacturing process of the wire was carefully inspected for longitudinal uniformity. Some wire segment samples from the same batch exhibited nonuniformity in the particle size distribution resulting in nonuniform filaments. This might have occurred in the wire for the second and third test coils.

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Section: Ramping Results Of Test Coil 2 Andmentioning

confidence: 72%

“…Fig. 3 shows Test coil 2's ramping current coil voltage and temperatures at around 21 K. From this chart, n-value was calculated to be around 4 [6].…”

Section: Ramping Results Of Test Coil 2 Andmentioning

confidence: 99%

See 1 more Smart Citation

Second Test Coil for the Development of a Compact 3 T $ \hbox{MgB}_{2}$ Magnet

Mine

Buresh

et al. 2013

IEEE Trans. Appl. Supercond.

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“…The cost of MgB 2 superconducting wire consisting of light elements is also expected to be nearly the same as or even lower than those for conventional superconductors because of the abundant raw materials. These superior characteristics offer an exciting opportunity for the development of the next generation of superconducting magnets, for example, lightweight, space-saving, and low-cost magnetic resonance imaging (MRI) magnets operated at a higher temperature (>10 K) than for the conventional system [3][4][5][6][7]. What is required for the real application of MgB 2 is, however, further improvement of the critical current density.…”

Section: Introductionmentioning

confidence: 99%

Control of core structure in MgB2 wire through tailoring boron powder

Maeda

Uchiyama

Hossain

et al. 2015

Journal of Alloys and Compounds

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“…Anticipation of increasing LHe prices and possible shortages in the near future have increased demand for LHe-free MRI magnets 1 3 . To fulfill the above requirements, magnesium diboride (MgB 2 ) has great potential among the conventional commercialized low- and high-temperature superconductors 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 . Importantly, the higher T c (39 K) of MgB 2 offers a larger thermal margin than the 9.8 K of Nb-Ti, even under LHe operation 19 20 21 .…”

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confidence: 99%

Solid cryogen: a cooling system for future MgB2 MRI magnet

Patel

Hossain

Qiu

et al. 2017

Sci Rep

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An efficient cooling system and the superconducting magnet are essential components of magnetic resonance imaging (MRI) technology. Herein, we report a solid nitrogen (SN2) cooling system as a valuable cryogenic feature, which is targeted for easy usability and stable operation under unreliable power source conditions, in conjunction with a magnesium diboride (MgB2) superconducting magnet. The rationally designed MgB2/SN2 cooling system was first considered by conducting a finite element analysis simulation, and then a demonstrator coil was empirically tested under the same conditions. In the SN2 cooling system design, a wide temperature distribution on the SN2 chamber was observed due to the low thermal conductivity of the stainless steel components. To overcome this temperature distribution, a copper flange was introduced to enhance the temperature uniformity of the SN2 chamber. In the coil testing, an operating current as high as 200 A was applied at 28 K (below the critical current) without any operating or thermal issues. This work was performed to further the development of SN2 cooled MgB2 superconducting coils for MRI applications.

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Test Coil for the Development of a Compact 3 T ${\rm MgB}_{2}$ Magnet

Cited by 21 publications

References 6 publications

Second Test Coil for the Development of a Compact 3 T $ \hbox{MgB}_{2}$ Magnet

Second Test Coil for the Development of a Compact 3 T $ \hbox{MgB}_{2}$ Magnet

Control of core structure in MgB2 wire through tailoring boron powder

Solid cryogen: a cooling system for future MgB2 MRI magnet

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