A5010318528- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Fusion materials and technologies
- Hydrogen embrittlement and corrosion behaviors in metals
- Corrosion Behavior and Inhibition
- Photocathodes and Microchannel Plates
- Advancements in Photolithography Techniques
- Nuclear Materials and Properties
- Plasma Diagnostics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Concrete Corrosion and Durability
- Radioactive element chemistry and processing
- Gyrotron and Vacuum Electronics Research
- Semiconductor materials and devices
- Industrial Vision Systems and Defect Detection
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Advanced Surface Polishing Techniques
- Metal and Thin Film Mechanics
- Advanced X-ray Imaging Techniques
- Non-Destructive Testing Techniques
- Topological Materials and Phenomena
Osaka University
1994-2025
High Energy Accelerator Research Organization
2013-2025
Tohoku University
2021-2024
Kumamoto University
2017-2024
Tokyo Institute of Technology
1990-2024
Hiroshima City Asa Citizens Hospital
2024
North Medical Center
2024
National Institute for Materials Science
2001-2023
University of Tsukuba
2023
Japan Atomic Energy Agency
2010-2021
We demonstrate room temperature pulsed operation of nitride based multi-quantum-well (MQW) laser diodes with cleaved mirror facets grown on a conventional C-face sapphire substrate. Cleavage was performed along the <11*BAR*2*BAR*0> direction substrate, and resultant facet analyzed using an atomic force microscope (AFM) theoretical calculation. A single peak emisson, at wavelength 417.5 nm, full width half-maximum 0.15 obtained. The threshold current density 50 kA/cm 2 voltage for 20 V.
The Monte Carlo simulations based on the 'heat bath' algorithms are implemented for following classical spin systems: (i) continuous-spin Ising model; (ii) XY model and (iii) Heisenberg model.
Investigation on variation of the electronic structure accompanying electrochemical lithium insertion into perovskite type oxide, (Li,La)TiO3, has been carried out by X-ray absorption spectroscopy (XAS). During insertion, titanium ion reduced its oxidation state from Ti4+ to Ti3+, while La3+ does not contribute reduction reaction resulting Ti K-edge and La L3-edge XAS, respectively. Furthermore, O XAS showed marked spectral changes with indicating around oxide affected reaction. From...
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...
Alveolar macrophages (AMs) are essential for maintaining lung homeostasis. However, their roles in respiratory infections have been controversial because the methods of depleting them often suffered from poor cell selectivity. To resolve this problem, we here used VeDTR technology to generate a transgenic mouse line which AMs can be specifically depleted using diphtheria toxin. When various were examined system, found that prevented proliferation Mycobacterium abscessus. This result differed...
Summary After invasion and replication, intracellular pathogens must egress from infected host cells . Toxoplasma gondii facilitates this process by permeabilizing releasing perforin-like protein 1 (PLP1) through induced microneme secretion. However, the precise mechanism of cell permeabilization remains enigmatic. Here, we identified secretory MIC11 as a key factor for membrane disruption. A CRISPR-based in vivo screen revealed several genes including an essential gene virulence. Deletion...
Abstract This paper describes the upgraded JT-60. The objectives of this upgrade are to improve plasma performance with minimum modification and obtain physical engineering database for design next-step tokamaks. original poloidal field coil system vacuum vessel exchanged new ones large D-shaped cross sections, which allow current up 6 MA, volume 100 m3 elongation 1.4 1.8 single nuli divertor configuration. Other equipments like toroidal coils, heating systems power supply used after minor...
The 500-keV negative-ion based neutral beam injector for JT-60U started operation in 1996. power has been increased gradually through optimizing parameters of the ion sources and conquering many troubles source supplies caused by a high voltage break-down accelerator. However, some issues remain to be solved concerning increasing further energy. most serious issue them is non-uniformity plasma arc chamber. Various countermeasures have implemented improve non-uniformity. Some those found...
We demonstrated the generation of a 500-keV electron beam from high dc voltage photoemission gun for an energy recovery linac light source [N. Nishimori et al., Appl. Phys. Lett. 102, 234103 (2013)]. This demonstration was achieved by addressing two discharge problems that lead to vacuum breakdown in gun. One is field emission generated central stem electrode. employed segmented insulator protect ceramic surface emission. The other microdischarge at anode electrode or chamber, which...
It is well known that a negative electron affinity GaAs photocathode shows moderate temporal response when excited by laser pulse of wavelength close to its band gap energy. We show here the can be estimated using diffusion model describes internal transport conduction electrons. Using transverse deflection cavity system, we measured profile bunch generated DC gun illuminated ps pulsed laser. A systematic set measurements cathodes with various active layer thicknesses and boundary conditions...
ZnS and ZnMgS layers have been grown onto GaP substrates by molecular beam epitaxy (MBE). The key parameters of the growth are a high substrate temperature sulfur (S) pressure. S pressure was typically 1×10−2 Pa, which more than one order magnitude larger in conventional MBE ZnS. Using pressure, large rate 0.3–1.0 μm/h could be obtained even at 490 °C. limited Zn supply. Optimization reduces full width half maximum (FWHM) (400) double-crystal x-ray rocking curve (DCXRC). For 2.1-μm-thick...
The transfer of Rose Bengal dianion (RB2-), a fluorescent ion with asymmetric charge distribution, across the 1,2-dichloroethane (DCE)|water (W) interface, has been studied using ac-modulated voltfluorometry, method that combines ac voltammetry fluorometry. phase angle component fluorescence shifts to value cannot be explained by theory based on simple combination heterogeneous and mass transfer. This anomaly strongly suggests RB2- ions transiently adsorb at interface in course...
Procurement of a dc −1 MV power supply system for the ITER neutral beam injector (NBI) is shared by Japan and EU. The Atomic Energy Agency as Domestic (JADA) contributes to procurement ultra-high voltage (UHV) components such generator, transmission line insulating transformer NBI supply. inverter frequency 150 Hz in major circuit parameters have been proposed adopted NBI. UHV insulation has carefully designed since long pulse quite different from conventional ac or short systems. A...
A high-voltage dc photocathode electron gun was successfully conditioned up to a voltage of 550 kV and long-time holding test for 8 h demonstrated at an acceleration 500 kV. The is designed future light sources based on energy-recovery linac consists Cockcroft–Walton generator, segmented cylindrical ceramic insulator, guard-ring electrodes, support-rod electrode, vacuum chamber, pressurized insulating gas tank. insulator the electrodes were utilized prevent any damage from electrons emitted...
A sintered lunar regolith is expected to be used construct buildings, roads, and landing pads for spacecrafts on the Moon. Here, we demonstrate that focused microwave heating effective rapid solidification of simulant obtain gravel without any susceptor. The conventional multimode oven cannot heat simulants requires susceptors such as silicon carbide (SiC) thermal insulators because its low dielectric loss. We achieved a using susceptor or insulator by forming an intense electric field...
Abstract Aims The human epididymis protein 4 (HE4), a novel fibrosis marker, is expressed only in activated fibroblasts and thought to reflect ongoing left ventricular (LV) fibrosis. LV feature of severe aortic stenosis (AS) related the post‐operative outcome patients with AS. We investigated relationship between serum levels HE4 prognosis Methods results measured 55 participants (80.8 ± 8.0 years old, male n = 26, 46%) AS prior surgical valve replacement ( 31, 56%) or transcatheter...
High-brightness, high-current electron guns for energy recovery linac light sources and high repetition rate X-ray free-electron lasers require an exit beam of ≥500 keV to reduce space-charge induced emittance growth in the drift space from gun following superconducting accelerator entrance. At Japan Atomic Energy Agency, we have developed a DC photoemission employing segmented insulator mitigate field emission problem, which is major obstacle operation at kV. The first demonstration...