A5071616272- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Fusion materials and technologies
- Physics of Superconductivity and Magnetism
- HVDC Systems and Fault Protection
- Iron-based superconductors research
- Thermal Analysis in Power Transmission
- Particle Accelerators and Free-Electron Lasers
- Superconductivity in MgB2 and Alloys
- Spacecraft and Cryogenic Technologies
- Corporate Taxation and Avoidance
- Electromagnetic Launch and Propulsion Technology
- Rare-earth and actinide compounds
- Magnetic Properties and Applications
- Microstructure and Mechanical Properties of Steels
- Nuclear and radioactivity studies
- Intellectual Capital and Performance Analysis
- Metallurgy and Material Forming
- Welding Techniques and Residual Stresses
- Vibration and Dynamic Analysis
- High voltage insulation and dielectric phenomena
- Mechanical stress and fatigue analysis
- Engineering Applied Research
- Corporate Finance and Governance
ITER
2024-2025
National Institutes for Quantum Science and Technology
2016-2023
Mitsubishi Heavy Industries (Japan)
2020
Japan Atomic Energy Agency
2008-2017
National Institute for Materials Science
2011
Toshiba (Japan)
2007
Advanced Science Research Center
1991-2005
We fabricated (Ba,K)Fe2As2 superconducting wires and tapes using the powder-in-tube method hot isostatic pressing (HIP). HIP showed a high value of transport critical current density (Jc) exceeding 100 kAcm−2 at T = 4.2 K self-field. Transport Jc in wire reached 38 magnetic field kOe. This is almost twice larger than previous highest among round iron-based superconductors. Enhancement was caused by improvement drawing process, which degradation core, formation microcracks, weak links between...
The concept for a compact DEMO reactor named 'SlimCS' is presented. Distinctive features of the are low aspect ratio (A = 2.6) and use reduced-size centre solenoid (CS) which has function plasma shaping rather than poloidal flux supply. CS enables us to introduce thin toroidal field coil system contributes reducing weight perhaps lessening construction cost. Low-A merits vertical stability high elongation (κ) normalized beta (βN), leads power density with reasonable physics requirements....
The Central Solenoid Model Coil (CSMC) was designed and built from 1993 to 1999 by an ITER collaboration between the U.S. Japan, with contributions European Union Russian Federation. main goal of project establish superconducting magnet technology necessary for a large-scale fusion experimental reactor. Three heavily instrumented insert coils were cover wide operational space testing. CS Insert, tested in April-August 2000. TF Federation, will be fall 2001. NbAl 2002. testing takes place...
Japan Atomic Energy Agency (JAEA) has fabricated and tested the four conductor samples composed of high performance strands manufactured by bronze-route process for ITER Central Solenoid (CS) conductor. The current sharing temperature (Tcs) electrically assessed at 45.1 K 10.85 T along cycling loading 48.8 kA initially were 6.0 6.1 K, then 5.3 5.5 after 6000 cycles first SULTAN sample named JACS01, respectively. As results second JACS02, Tcs values 7.2 6.8 6.6 10000 each conductor,...
The performance of four Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn conductors for the ITER central solenoids was tested. current sharing temperatures (T xmlns:xlink="http://www.w3.org/1999/xlink">cs</sub> ) were measured over approximately 9000 electromagnetic cycles, including two or three thermal cycles between 4.2 K and room temperature. T increased became almost constant through cycling. gradient electric field against...
The evolution of the superconducting properties round wires (Ba,K)Fe2As2 fabricated by powder-in-tube (PIT) method is systematically studied. After establishing to obtain largest transport critical current density (J c) in using hot isostatic press technique, we investigated how transition temperature (T c), J c, and microstructures change at each step wire fabrication. Unexpectedly, find that core are significantly damaged drawing process. Systematic measurements c T superconductor after...
The world's largest pulsed superconducting coil was successfully tested by charging up to 13 T and 46 kA with a stored energy of 640 MJ. ITER central solenoid (CS) model CS insert were developed fabricated through an international collaboration, their cooldown tests carried out test operation teams. In tests, where the original goal 0.4 T/s T, achieved ramp rates 0.6 1.2 T/s, respectively. addition, charged discharged 10 003 times in background field no degradation operational temperature...
We have fabricated (Sr,K)Fe2As2 superconducting wire through a powder-in-tube method that is combined with hot isostatic pressing technique. The transport Jc in the at 4.2 K has reached 1.0 × 105 A cm−2 under self-field, and 9.4 103 100 kOe. This first report reaches 1 round wire. Magneto-optical imaging of confirmed large intergranular critical current density core. microstructure compositional analyses imply there room for improvement value optimization fabrication process.
(Ba,K)Fe2As2 superconducting wires and tapes are fabricated by using hot isostatic pressing (HIP) technique, their properties studied. In the HIP round wire, transport critical current density (Jc) at 4.2 K has achieved record-high value of 175 kA/cm2 zero field, exceeds 20 even 100 kOe. Improvement polycrystalline powder synthesis may play a key role for enhancement Jc. tape, larger Jc 380 is realized field. Based on magnetization magneto-optical measurements, possible further discussed.
We report the fabrication of small (Ba,A)Fe2As2 (A: Na, K) coils using 10 m-class long round wires, fabricated by powder-in-tube (PIT) method. Coils are sintered hot-isostatic-press (HIP) technique after glass-fiber insulations installed. Critical current (Ic) whole coil (Ba,Na)Fe2As2 and (Ba,K)Fe2As2 60 A 66 under self-field, generated magnetic fields at center reach 2.6 kOe 2.5 kOe, respectively. Furthermore, largest transport critical density (Jc) Ic in wires picked up from 54 kAcm-2 51.8...
We fabricated CaKFe4As4 round wires through a powder-in-tube method followed by hot isostatic pressing up to 175 MPa. The transport critical current density, Jc, at 4.2 K almost reached the level for practical applications (100 kA cm−2) under self-field and 7.6 cm−2 100 kOe. Magneto-optical images confirmed that grains were well-connected low temperatures. Although high-pressure sintering high temperatures enhanced Jc density of core wires, X-ray diffraction scanning electron...
The engineering critical current density (JE) and the index of transition, N (where E = αJN), a Nb3Al multifilamentary strand, mass-produced as part Fusion programme, have been characterized function field (B), temperature (T) strain (ε) in ranges B ≤ 15 T, 4.2 K T 16 −1.79% ε +0.67%. Complementary resistivity measurements were taken to determine upper (BC2(T, ε)) (TC(ε)) directly. defined at 5%ρN, 50%ρN or 95%ρN, is described by empirical relation BC2ρN(T, ε) BC2ρN(0, ε)[1 −(T/TCρN(ε))ν]....
A Nb3Al superconductor inherently has the outstanding features of a high critical field and an excellent strain tolerance in current performance. The Japan Atomic Energy Research Institute developed world's first large coil using jelly-roll processed strands. This was successfully operated up to nominal 46 kA 13 T, respectively. test results demonstrated that conductor is suitable for application field, magnets, such as toroidal (TF) coils fusion reactor. In parallel with this work, strand...
Several conductor samples were fabricated and tested in the SULTAN facility at CRPP for ITER Central Solenoid (CS) qualification. From result of cyclic testing on first second named CSJA01 CSJA02, continuous linear degradation current sharing temperature (Tcs) was found. visual inspection, a large deflection lower loading side (LLS) high field zone (HFZ) observed. The bending strain strands cannot be evaluated from only obtained visually. To evaluate quantitatively, neutron diffraction...
The performances of six <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${\rm Nb}_{3}{\rm Sn}$</tex></formula> conductors for the ITER Toroidal Field coils were tested. Four them showed similar degradation rates their current sharing temperatures Notation="TeX">$T_{cs}$</tex> </formula> over 1,000 electromagnetic cycles. By contrast, two sharp Notation="TeX">$T_{cs}$</tex></formula> degradations at 50...
We demonstrate a large enhancement of critical current density (Jc) up to 1.0x10^7 A/cm2 at 5 K under self-field in (Ba,K)Fe2As2 single crystals by irradiating 320 MeV Au ions. With the very promising potential this material mind, we have fabricated superconducting wire through powder-in-tube method combined with hot isostatic pressing technique, whose effectiveness has been proven industrial Bi2223 tapes. The Jc 4.2 reached 37 kA/cm2 and 3.0 90 kOe. Magneto-optical imaging confirmed...
The Central Solenoid Model Coil (CSMC) was designed and built by ITER collaboration between the European Union, Japan, Russian Federation United States in 1993-2001. Three heavily instrumented insert coils have been also for testing background field of CSMC to cover a wide operational space. TF Insert simulate conductor performance under coil conditions. tested Test Facility at Japan Atomic Energy Research Institute, Naka, September-October 2001. Some measurements were performed on study...
The ITER model coil experiments have revealed that degradation of the critical current (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> ) and n index occurred in large Nb xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn CICC's larger electromagnetic force, was degradation. However, such not observed Al CICC. authors developed a new model, which I an individual strand taken into account, to interpret these results. Analytical...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Japan Atomic Energy Agency has developed four types of <formula formulatype="inline"> <tex>$\hbox{Nb}_{3}\hbox{Sn}$</tex></formula> strand which can be used in the ITER TF coils. One is a made by an internal tin process and others are bronze strands. The achieved critical current density more than 790 formulatype="inline"><tex>$\hbox{A/mm}^{2}$</tex> </formula> strands 980...