Feasible Applications of Bulk HTS Magnets and Magnetic Field-Capturing Characteristics in Their Activation Processes

Oka, Tetsuo; Shimizu, Kouki; Higa, Kazuya; Tsunoda, Shunta; Ogawa, J.; Fukui, Satoshi; Satô, Takao; Yokoyama, K.; Nakamura, Takashi

doi:10.1109/tasc.2018.2867784

Cited by 1 publication

(2 citation statements)

References 20 publications

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“…Thus, we should consider well the parameters, such as material compositions, dimensions, and anisotropic magnetic properties, to optimize the useful field distribution for NMR magnets. As the concave shape shifts to convex with increasing distance from the pole surface, the presence of a homogeneous field space is expected in the shifting process [12]. Figure 6 shows one of the mapping data obtained at the 20×20 mm 2 area in the x-y plane at z=0.5 mm above the iron plate surface.…”

Section: Experimental Procedures 21 Magnetic-pole Structures and Arrmentioning

confidence: 99%

“…We obtain the field intensity at 21 points in the 4×4 mm 2 areas of the x-y plane by scanning the Hall probe with a pitch of 1 or 0.5 mm. Then the uniformity data were calculated using equation (1) [12]. These data were plotted in a colored map, indicating the data in the respective points in the plane.…”

Section: Experimental Procedures 21 Magnetic-pole Structures and Arrmentioning

confidence: 99%

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Formation of uniform magnetic flux distribution for NMR magnets using HTS bulk magnets activated by pulsed-field magnetization

Oka

Inoue

Tsunoda

et al. 2020

Mater. Res. Express

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Nuclear magnetic resonance (NMR) magnets generally need an extremely uniform magnetic field in the space where the specimens will be placed. Although high temperature superconducting bulk magnets can obtain an intense magnetic field of more than 3 T, the field distribution is intrinsically characterized to be inhomogeneous, showing steep gradient. Aiming at the practical application of compact and portable NMR magnets, the authors have developed magnet systems capable of generating uniform magnetic fields in a narrow space between face-to-face settled magnetic poles, targeting to obtain a uniform magnetic field between the poles. Here, the authors modified the shape of magnetic field distribution from convex to concave by attaching a ferromagnetic iron plate on one of the pole surfaces, and then settled them face to face with a gap of 70 mm. The uniformity of the magnetic field in the x-y plane was experimentally measured and estimated along various z-axis directions. The best uniformity of 463 ppm at 1.25 T was obtained in the experimental evaluation in the x-y plane of 4×4 mm 2 at z=0.5 mm from the iron plate surface. The value of uniformity along the z-direction range was extended from 0.8 mm to a depth of 1.1 mm. These results show that the possible space of NMR signal detection or the available sample size can be enlarged.

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Section: Experimental Procedures 21 Magnetic-pole Structures and Arrmentioning

confidence: 99%

Section: Experimental Procedures 21 Magnetic-pole Structures and Arrmentioning

confidence: 99%

Formation of uniform magnetic flux distribution for NMR magnets using HTS bulk magnets activated by pulsed-field magnetization

Oka

Inoue

Tsunoda

et al. 2020

Mater. Res. Express

Self Cite

View full text Add to dashboard Cite

show abstract

Feasible Applications of Bulk HTS Magnets and Magnetic Field-Capturing Characteristics in Their Activation Processes

Cited by 1 publication

References 20 publications

Formation of uniform magnetic flux distribution for NMR magnets using HTS bulk magnets activated by pulsed-field magnetization

Formation of uniform magnetic flux distribution for NMR magnets using HTS bulk magnets activated by pulsed-field magnetization

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