A5055202595- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Physics of Superconductivity and Magnetism
- Laser-induced spectroscopy and plasma
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Magnetic Properties and Applications
- Magnetic Field Sensors Techniques
- Laser Design and Applications
- Occupational Therapy Practice and Research
- Erythrocyte Function and Pathophysiology
- Ethics in medical practice
- Electronic Packaging and Soldering Technologies
- Education and Learning Interventions
- Quinazolinone synthesis and applications
- HVDC Systems and Fault Protection
- Microbial infections and disease research
- 3D IC and TSV technologies
- Advanced Data Storage Technologies
- Geomagnetism and Paleomagnetism Studies
Nagoya University
2001-2025
National Institutes for Quantum Science and Technology
2016-2024
The Graduate University for Advanced Studies, SOKENDAI
2023-2024
High Energy Accelerator Research Organization
2023
Mitsubishi Heavy Industries (Japan)
2020
University of California, Los Angeles
2006-2014
Heparinized saline is used to prevent catheter obstruction; however, it associated with concerns regarding the incidence of heparin-induced thrombocytopenia and accuracy blood test results. This study compared impact without heparin on central venous occlusion rates in post-surgical intensive care unit patients using a prospective, double-blinded, randomized, controlled design. Patients aged 20-90 years planned experience insertion postoperative admission were enrolled randomly assigned...
Resonant interactions between energetic electrons and whistler mode waves are an essential ingredient in the space environment, particular controlling dynamic variability of Earth's natural radiation belts, which is a topic extreme interest at moment. Although theory describing resonant wave-particle interaction has been present for several decades, it not hitherto tested controlled laboratory setting. In Letter we report on first experiment to directly detect pitch angle scattering...
The fabrication of nine ITER toroidal field coils (TFCs) has been completed successfully in Japan. When a set 18 TFCs are installed around the vacuum vessel, it generates plasma-confinement magnetic field. To achieve required quality, error should be limited to 50 ppm nominal This requirement is propagated each component magnet system as manufacturing and assembly tolerances. For TFC, this given terms current center line (CCL) Even though TFC gigantic module 9 m wide 16.5 high, positional...
The superconducting tokamak fusion test device, JT-60SA, was constructed as the Satellite Tokamak project in Broader Approach Program between Japan and EU. During JT-60SA integrated commissioning tests of Nb-Ti equilibrium magnetic field coil EF1 high voltage (∼5 kV) test, power supply current surged suddenly stopped by overcurrent interlock supply. At same time, vacuum cryostat deteriorated, pressure magnet cooling loops increased. After system warmed up, visual inspection revealed that...
QST, as Japan Domestic Agency in ITER, has responsibility to procure 9 ITER Toroidal Field (TF) coils and all 19 TF Coil Cases (CC). The are procured by two suppliers accelerate their production. series production of Double-Pancakes (DPs) Winding Pack (WP) progress both manufacturing lines. 55 DP windings, 40 impregnation curing, 3 WPs 8 CCs have been completed. Series coil WP CC progressing Japan. Assembly is proceeding gap-filling was completed the first coil. Since remaining process only...
Quantum and Radiological Science Technology (QST), a Japan Domestic Agency in ITER, is responsible for procuring nine ITER Toroidal Field coils. QST developed an optimized manufacturing plan to solve technical issues double-pancake (DP) fabrication winding pack (WP) fabrication, such as optimization of inter-DP glass fabric thickness avoid damage DP WP insulation degradation conductor near joint due compression during impregnation. To this purpose, was successfully increased by 3 mm putting...
Full-scale trials were performed to qualify and optimize the manufacturing procedure of toroidal field (TF) coil prior series production. In full-scale trials, winding, reaction heat-treatment, conductor transfer, insulation, cover plate (CP) welding resolve some technical issues demonstrate fabrication procedure. Major requirements are: high accuracy winding 0.01%; evaluation elongation due heat-treatment; transfer in a radial groove without adding more than 0.1% strain conductor;...
QST, as Japan Domestic Agency in ITER, has responsibility to procure nine ITER toroidal field (TF) coils and all 19 TF coil cases (CC). The are procured by two suppliers accelerate their production. series production of double pancakes (DPs) winding pack (WP) progress both manufacturing lines. In total, 45 DP windings, 30 impregnation curing, the first WP cold test second have been completed. addition, four CCs Assembly CC will start from beginning 2019. To qualify assembly CC, trials...
The ITER Toroidal Field (TF) coil is a D-shaped superconducting magnet. A set of 18 TF coils forms donut shape when assembled around the vacuum vessel. magnetic property characterized by current center line (CCL). To serve their function as plasma containment magnets, severe requirement φ2.6 mm cylindrical tolerance defined for critical portion coils. In previous study, manufacturing tooling and procedure have been developed applied Winding Packs (WP) Coil Case (TFCC) subassemblies....
It is important to achieve sufficiently low joint resistance (RJ), as 3 nQ with a background field of 2 T and nominal current 68 kA reduce the loss by Joule heating during operation, for interdouble-pancake joints ITER TF coil termination. However, large cryostat required cool down R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">J</sub> measurement at 4 K because huge mass size coil. Authors, therefore, developed an inspection method, which...
For inter-double-pancake joints of ITER TF it is required to achieve sufficiently low joint resistance (R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">J</sub> ), as 3 nΩ, reduce Joule heating during operation with a background field 2 T and nominal current 68 kA. If R value measured directly, large cryostat cool down the coil huge mass size measurement at 4 K. As alternative, authors have developed new inspection methods obtain value. The...
Abstract The first ITER toroidal field coil (TFC) has been successfully manufactured by the Japanese Domestic Agency in January 2020. TFCs are largest Niobium Tin (Nb 3 Sn) superconducting magnets world; each is enclosed an austenitic stainless-steel case with a height of 16.5 m and total weight 310 tons (Knaster et al 2008 IEEE Trans. Appl. Supercond. 18 495–498). A set will be installed around vacuum vessel to function as plasma confinement magnet system. responsibility procure 1 spare...
Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn superconducting wires are under consideration for producing high field accelerator magnets the proposed Future Circular Collider (FCC) due to their critical field. R&D studies ongoing worldwide with a target non-Cu current density ( <italic xmlns:xlink="http://www.w3.org/1999/xlink">J<sub>c</sub></i> ) of 1500 A/mm <sup xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at 4.2 K, 16...
Microelectromechanical systems (MEMS) have led to the development of a host tiny machines and sensors over past decade. Plasma physics is in great need small detectors for several reasons. First all, very do not disturb plasma, secondly some can only work because they are small. We report on first series (sub-Debye length) probes laboratory plasmas undertaken at basic Science Facility UCLA. The goal develop robust sensitive diagnostic that survive plasma. must electronics packages close...
This paper presents microfabricated sensors for directly measuring fine-scale plasma parameters in typical laboratory plasmas. Microfabricated probes have the potential to significantly advance basic physics by enabling measurement of fundamental processes under controlled conditions. Historically, spatial scales finest electromagnetic-field fluctuations plasmas been too small conventionally fabricated tools sense. The new are arrays electric-field Debye-scale structures Large Plasma Device...
The ITER Toroidal Field (TF) coil is composed of a Winding Pack (WP) and TF case (TFCC). In the manufacturing coil, gap between WP TFCC filled with radiation resistant Triglycidyl-p-aminophenol (TGPAP) resin. Vacuum Pressure Impregnation (VPI) adopted. selected resin system displayed two potential problems: high viscosity cracking after cure. A series production optimizations have been performed to develop techniques apply for production: crack countermeasure, narrow injection, pressure...
A technique of (2+1)-photon laser-induced fluorescence (LIF) spectroscopy has been developed for measuring hydrogen atom density in plasmas. In this method, the following two-step excitation scheme is employed to excite ground-state H atoms 4p state. first step, at ground (1s) state are excited 2s by two photons a wavelength 243 nm. Subsequently, third photon 486 nm second step. Fluorescence emission (4p→2s, Hβ line) detected determine Since used first-step half second-step excitation, one...
Toroidal field (TF) coils are superconductive magnets, which create a magnetic to confine plasma in vacuum vessel. In order confirm TF coil's functionality, the created by coil needs be evaluated, and therefore, accurate measurement of current center line (CCL) for winding pack (WP) within is necessary. However, determination CCL direct difficult WP due its complicated structure manufacturing steps. To overcome these complications, method determine positions composition measurements...
Most of the Toroidal Field coils have already been delivered to ITER site and TF Coil preparatory work is ongoing in Preparation Building before Sector Sub-Assembly. For work, Organization established installation process Inner Leg Intercoil Structure (ILIS) panels, which are key components keep Coils insulated from each other maintain gap as 2 mm nominal between Coils, by welding washer-shaped parts push panels onto Leg. In addition, Local Machining Tools (LMT) were also developed make...
For an accelerator magnet, a certain mechanical strength is required to sustain against transverse compression stress due Lorentz force. A bronze-route Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn wire with Cu-Nb reinforcement was developed by Tohoku University and Furukawa Electric enhance the axial tension. The also exhibited some indication of improvement compression; however, details mechanism for have not been clarified. In...
ITER toroidal field coils are electrically connected to 68-kA main busbars (terminal joints). We propose the measurement of electric potential distribution in a terminal joint using electrical probes (e-probe method) inspect contact resistance joint. In this study, we experimented with mockup The test current was 20 A, and measured e-probe method at room temperature 77 K. Nine different degradation patterns were prepared by distributing polyimide films interface. Next, performed finite...
Abstract In 2023, the manufacturing of all ITER TF coils has been completed 15 years after sign procurement arrangements in 2008. This paper jointly submitted by F4E and QST to recollect lessons learnt production two parties along last years.
The National Institutes for Quantum and Radiological Science Technology (QST) is responsible manufacturingnine ITER TF coil winding packs (WPs). QST has been proceeding WP manufacturing, the procedure which developed through qualification trials authors’ experiences. However, since a huge superconducting that never fabricated so far, technical challenges newly arose when manufacturing first WP, such as tight dimension tolerance, current center line (CCL) position control non-destructive...