A5070153490- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- Superconductivity in MgB2 and Alloys
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Frequency Control in Power Systems
- Educational Robotics and Engineering
- Engineering Education and Curriculum Development
- Magnetic confinement fusion research
- Magnetic Properties and Applications
- HVDC Systems and Fault Protection
- Characterization and Applications of Magnetic Nanoparticles
- Cancer-related gene regulation
- Geomagnetism and Paleomagnetism Studies
- Rare-earth and actinide compounds
- Higher Education Learning Practices
- Iron-based superconductors research
- Connective Tissue Growth Factor Research
- Magnetic Bearings and Levitation Dynamics
- Cell Adhesion Molecules Research
- Particle accelerators and beam dynamics
- Metal and Thin Film Mechanics
- Electric Motor Design and Analysis
Shibaura Institute of Technology
2018-2024
Hokkaido University
2024
Niigata University
2009-2018
ABB (Japan)
2014-2015
Ashikaga University
2011-2013
Nagoya University
2002-2009
Aisin (Japan)
1991-2006
Material (Belgium)
1992-2005
Iwate University
2003
Aisin (United States)
2003
Large c-axis-oriented Sm - Ba Cu O bulk superconductors were prepared using the melt-process technique in a reduced oxygen atmosphere. Single-domain samples up to 36 mm diameter successfully and reproducibly synthesized with no severe weak-link within samples. The trapped magnetic field at open surface of sample was recorded as 8.0 T 40 K when measured immediately after external swept down zero. This value far exceeds that melt-processed Y similar size.
Abstract We developed a trapped‐field magnet system using bulk high‐temperature superconducting (HTS) material (Sm‐Ba‐Cu‐O; abbreviated as Sm123) and used it to observe signal of 1 H nuclear magnetic resonance (NMR). The compact can fit on table needs no conventional refrigerant such liquid helium. has c ‐axis‐oriented single‐domain Sm123 superconductor containing 20 wt.% Ag was synthesized in the melt‐textured process. is constructed two cylindrical pieces, 36‐mm outer 7‐mm inner diameters,...
A DC motor equipped with melt-processed Y-Ba-Cu-O (YBCO) superconductors as field magnets was constructed. The YBCO bulks were magnetized at temperatures of 65-77 K in a liquid nitrogen vessel by applying pulsed magnetic field. maximum output power 940 W when the cooled to 65 K. Continuous running tests carried out for up 6 h. We found that trapped fluxes are hardly affected 7500 A/m generated armature current and cooling low is very effective holding high level and, hence, substantially...
A c-axis oriented single-domain Sm–Ba–Cu–O bulk superconductor 36 mm in diameter was magnetized by the pulsed field magnetization (PFM) method at 30, 35 and 77 K. The trapped distributions after applying fields with different amplitudes were measured scanning a Hall sensor 0.5 above surface of sample. We also time evolution magnetic during PFM using an oscilloscope connected to two sensors mounted on surface. Fluxes are found penetrate into escape from it choosing passes through direction...
In this study, high-density magnesium diboride (MgB2) bulk superconductors were synthesized by spark plasma sintering (SPS) under pressure to improve the field dependence of critical current density (Jc-B) in MgB2 superconductors. We investigated relationship between conditions (temperature and time) Jc-B using two methods, ex situ (sintering powder) (reaction Mg B powder), respectively. As a result, we found that higher with suppressed particle growth suppression formation coarse particles...
Our research is to magnetize the high-T/sub c/ bulk superconductors and supply magnetic field environment realized by superconducting magnets various applications. In this paper, we aim apply high gradient separation (HGMS). Using a face-to-face type magnet system in which pair of are oppositely arranged, Y123 magnetized "IMRA" method (pulsed magnetization), consequently, 1.6 T achieved between poles. Next, HGMS using demonstrated. A pipe into filter matrices composed ferromagnetic wires...
A trapped magnetic field B T P as high 4.47 T, which is the highest reported using pulse magnetization to date, has been realized on surface of a GdBaCuO bulk superconductor by modified multi technique combined with stepwise cooling. Following an introduction small amount flux into center applying lower fields ex =4.5–4.6 twice at higher starting temperature s =45–48 K, =6.6–6.7 are applied three times =28–29 K. The reduction in rise due already existing flux, addition optimization value ,...
In this paper, effects of geometrical configuration on AC loss characteristics cable conductors assembled by multiple YBCO tape in polygonal arrangement were numerically studied. The previously developed numerical model was modified to analyze the HTS polygonally multi-layer cable. By using model, influences parameters, especially width and tape-to-tape gap, properties evaluated.
The magnetic field distributions of an HTS bulk magnet system were precisely measured between the face-to-face 3.4-T poles. After activation by 5-T cooling magnetization, flux density has reached value 2.26 T at center 34-mm gap. sum local fields generated from each pole coincides with strength in We estimated homogeneity densities B <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">z</sub> and xmlns:xlink="http://www.w3.org/1999/xlink">y</sub> ,...
The time evolutions of temperature rise ΔT(t) after pulse field magnetizing have been measured on the surface a cryo-cooled YBaCuO bulk superconductor. ΔT increases with increasing strength, and quite large (ΔTmax ∼ 18.8 K) is observed just before trapped magnetic flux reaches central region bulk. epoxy resin, impregnated coated to crystal for mechanical reinforcement, prevents heat exhaust towards cold stage refrigerator it needs much recover its initial temperature. spatial distribution...
The time evolutions and spatial distributions of temperature rise ΔT(t) have been measured on the surface a cryo-cooled SmBaCuO bulk superconductor after iterative pulse field magnetizing with same amplitude. For applied Bex ⩽ 4.64 T, maximum ΔTmax monotonically decreases approaches steady behaviour an increasing number times applications. On other hand, for = 5.42 keeps third application in specific growth sector region clear anisotropic has found. magnetic fluxes preferentially enter leave...
The effects of a magnetic field on the Mott transition, longstanding issue in condensed matter physics, are studied using magnetoresistance measurements for organic insulators, $\ensuremath{\lambda}\text{\ensuremath{-}}{(\text{BETS})}_{2}{\mathrm{GaBr}}_{x}{\mathrm{Cl}}_{4\ensuremath{-}x}$, up to 55 T. We demonstrate that an insulator-to-metal transition with first-order nature and successive superconductor-to-insulator-to-metal induced by fields. discuss difference susceptibility between...