A5103225349- Physics of Superconductivity and Magnetism
- Surface and Thin Film Phenomena
- HVDC Systems and Fault Protection
- Superconducting Materials and Applications
- Superconductivity in MgB2 and Alloys
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Magnetic Properties and Applications
- Metallurgical Processes and Thermodynamics
- Thermal Analysis in Power Transmission
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Radiation Detection and Scintillator Technologies
- ZnO doping and properties
- X-ray Spectroscopy and Fluorescence Analysis
- Photocathodes and Microchannel Plates
- Islanding Detection in Power Systems
- Electrical and Thermal Properties of Materials
- Power Systems and Renewable Energy
- Force Microscopy Techniques and Applications
- Advancements in Solid Oxide Fuel Cells
- Silicon Carbide Semiconductor Technologies
- Particle accelerators and beam dynamics
- Electron and X-Ray Spectroscopy Techniques
Nagoya University
2024-2025
Showa Corporation
2018
Kyushu University
2011-2013
Tokai University
2009-2011
Abstract Alkali antimonide semiconductor photocathodes are promising candidates for high-brightness electron sources advanced accelerators, including free-electron lasers (FEL), due to their high quantum efficiency (QE), low emittance, and temporal resolution. Two challenges with these (1) the lack of a universal deposition recipe achieve crystal stoichiometries (2) susceptibility vacuum contamination, which restricts operation pressure ultrahigh vacuums leads short lifetime extraction...
We have investigated the lateral distributions of critical current densities in narrow coated conductors slit by different cutting methods. The objective was to find an optimal slitting process make a conductor that should be effective for ac loss reduction assembled such as power transmission cables. In-plane 2-D distribution density characterized means scanning Hall-probe microscopy. From analysis along width direction, we could estimate degradation at both tape edges. determined...
HTS current leads have been prepared by the TFA-MOD processed YBCO tapes 5 mm in width and around 120 μm overall thickness. The superconducting thin layer with 1.5 is formed on oxide buffer layers deposited Hastelloy substrate tape. critical of 100 A at 77 K self-field. lead unit composed a GFRP board five soldered to Cu cap both ends. transport ten units ranges from 536 408 liquid nitrogen. assembled parallel. 4,000 was stably carried no voltage generation for minutes. Furthermore, trans...
For the power line between a generator and step-up transformer, isolated bus (IPB) is generally used. The present IPB has normal cylindrical conductor made of aluminum or copper at center outer jacket generates very huge Joule loss. To decrease it, superconducting buses have been developing. In this study, 22-kV 3-kA triaxial was designed fabricated with YBa2Cu3O7-d (YBCO) tapes various kinds properties were investigated. Previously, ac lightning impulse withstand voltage test, critical...
Superconducting coated conductors made of REBCO—REBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7–</sub> <italic xmlns:xlink="http://www.w3.org/1999/xlink"><sub>δ</sub></i> , where RE is a rare earth element (Y, Gd, Sm, Nd, Eu, etc.), potentially improve the performances motors, generators, transformers, and cables superconducting...
Using a scanning Hall-probe microscopy, we have developed noncontact characterization method for multifilamentary coated conductors. In-plane distributions of sheet current density in conductor were visualized at different conditions external magnetic field. From these results, could extract local critical and equivalent width each filament as function longitudinal position. These items will be indispensable quality control conductors the precise estimation their AC losses. This means that...
We have succeeded in significant improvement measuring speed of scanning Hall-probe microscopy for two-dimensional characterization local critical current density a coated conductor. A typical was 36 m/h with spatial resolution 1 mm longitudinal direction and 40 micrometers width while the combination could be changed on demand. This 200 times faster than our previous system, applicable to long-length From magnetic field distribution remanent state, we estimate in-plane nondestructive...
HTS current leads have been prepared by the TFA-MOD processed YBCO tapes. A lead unit is composed of five tapes soldered to Cu caps at both ends and a GFRP board. The tape 5 mm in width, 190 length about 120 ¿m overall thickness. superconducting layer, 1.5 thickness, formed on oxide buffer layers GZO CeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> deposited Hastelloy substrate Transport supplied through Ag layer layer. with critical...
Abstract As accelerators and electron microscopes become more advanced, high-performance photocathodes are required. In particular, Cesium potassium antimonide (CsK 2 Sb) photocathode is of interest because its low emittance, excitability in visible light, high quantum efficiency (QE). The challenge susceptibility to environment that lead operating vacuum pressure short lifetime/low extraction charge. To resolve these issues, it necessary understand the molecular structure cathode...
Superconductive current lead has been prepared by the TFA-MOD processed YBCO tapes. That is composed of 12 tapes having critical (Ic) around 100 A at 77 K. The are 4.5 mm in width, 200 length and about 120 μm thickness. 1 thick superconductive layer formed on HastelloyTM substrate tape with buffer oxide layers through process. arrayed both sides (6 one side) stainless steel board 3mm thickness for a type. They similarly soldered to copper caps ends.The transport 1,000 was stably applied 10...
Using a scanning Hall-probe microscopy, we have investigated in-plane distribution of critical current density in TFA-MOD processed YBCO coated conductors. We compared the distributions for two kinds conductors with different directions gas flow at calcinations. As result, it was found that direction largely influenced density. For example, maximum value 1.5 times higher than average sample width direction. On other hand, relatively uniform one axial perpendicular to surface conductor. These...