A5101433192- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Superconductivity in MgB2 and Alloys
- Magnetic and transport properties of perovskites and related materials
- Frequency Control in Power Systems
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Atomic and Subatomic Physics Research
- Electronic Packaging and Soldering Technologies
- NMR spectroscopy and applications
- HVDC Systems and Fault Protection
- Theoretical and Computational Physics
- Magnetic Properties of Alloys
- Electronic and Structural Properties of Oxides
- Magnetic Bearings and Levitation Dynamics
- Dark Matter and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- Particle physics theoretical and experimental studies
- Magnetic Properties and Applications
- Advanced MRI Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced Electrical Measurement Techniques
Shin Poong Pharm (South Korea)
2014-2020
A 26 T 35 mm winding diameter all-GdBa2Cu3O (GdBCO) magnet was designed by the MIT Francis Bitter Magnet Laboratory, and constructed tested SuNAM Co., Ltd. With multi-width (MW) no-insulation (NI) high temperature superconductor (HTS) technique incorporated, is highly compact; its overall height are 172 327 mm, respectively. It consists of a stack NI double pancake coils wound with MW GdBCO tapes in five different widths ranged 4.1–8.1 mm. In bath liquid nitrogen at 77 K, had charging time...
We report in detail on SuNAM's reactive co-evaporation by deposition and reaction (RCE-DR) process. have successfully fabricated a high performance GdBCO coated conductor (CC) with throughput the RCE-DR process, that consists of two steps for elemental metal oxides conversion cation into superconducting phase. Constituting metals such as Gd, Ba Cu were first deposited LaMnO3 (LMO)-buffered IBAD-MgO templates at low temperatures pressures followed temperature treatment step under oxygen...
This paper presents experimental and theoretical studies of the no-insulation (NI) winding method second-generation high-temperature superconducting (HTS) wire. We compared two single pancake coils wound by different HTS wires. One coil is made a normal wire with an electroplated copper stabilizer. The other same only difference in additional outermost layer stainless steel. employed equivalent circuit model to evaluate our results. tested both simple operating procedure consisting steps:...
A conduction-cooled 3 T 100 mm winding bore multi-width and no-insulation (NI) all-REBCO magnet was designed, constructed tested at 13 K. The consists of a stack double pancake (DP) coils wound with, for the first time, REBCO tapes having 1 μm thick layer stainless steel, named 'metallic cladding', that surrounds in hermetic way to substantially reduce NI charging delay. After construction, cooled down target operating temperature K using two-stage pulse-tube cryo-cooler. During...
We report the design, construction, and operation results of an 18 T 70 mm cold-bore high temperature superconductor (HTS) no-insulation (NI) magnet, which is developed for axion haloscope experiment. The magnet consists 44 double-pancake coils wound with multi-width multi-thickness REBa2Cu3O7-x (RE = rare earth) tapes. Owing to NI feature, highly compact; 162 in outer diameter 476 tall; provides environment 0.22 T2 m3 within target space 66 200 length. After initial performance test at...
We present a design of 400-MHz/60-mm all-REBCO nuclear magnetic resonance (NMR) magnet (H400) that consists stack 56 double-pancake (DP) coils. With the multiwidth no-insulation technique incorporated, DP coils were wound with REBCO tapes five different widths, i.e., 4.1, 5.1, 6.1, 7.1, and 8.1 mm; placed at near midplane narrowest (4.1 mm wide) tapes, whereas those progressively wider toward top bottom magnet, where "perpendicular field B <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A 3-T 100-mm winding bore conduction-cooled REBCO magnet has been designed, constructed, and tested. It consists of a stack double pancake coils wound with metallic cladding (MC) tapes, for which 1-2 μm stainless steel was clad in hermetic way around the tapes. This approach, first proposed by SuNAM Company Ltd. 2015, is expected to substantially reduce charging time delay no-insulation magnet, turn will be effective manipulation screening currents such as improve field homogeneity magnets,...
We developed a prototype of high-Tc superconducting (HTS) linear synchronous motor (LSM) and evaluated its operational performances to obtain the preliminary design data for test vehicle having speed 518.4 km/h. The HTS electromagnet was fabricated using non-insulated (NI) GdBCO coil, which designed produce magnetomotive force 300 kA-turns at cooling temperature 20 K. A two-stage Gifford-McMahon cryocooler used cool electromagnet. tested up 2.7 kN sufficient required thrust vehicle....
POSCO and the Research Institute of Industrial Science Technology developed a 10-kW superconducting synchronous generator using high-temperature wire. The consists four-pole racetrack-type coils GdBCO wire for rotor 24 slots copper windings stator. rated power was 10 kW at 600 r/min, operating temperature 30 K by thermosyphon cooling method liquid neon. output measured when connected to vector motor, detailed results were discussed in this paper.
We fabricated superconducting magnet using second-generation (2G) high-temperature wire by SuNAM. Magnetic field strength at the center is 4 T, and room temperature bore diameter 203 mm. The consists of 30 double pancake coils (DPCs) with inner 245 mm outer 297 All pancakes were wound no-insulation method performance tested separately before assemble. Tested DPCs resistively connected HTS tape(splice joint), assembled coil was conduction cooled a two-stage Gifford-McMahon cryo-cooler to...
The architecture of coated conductor (CC) tapes plays an important role in its overall mechanical and electromechanical performance characteristics. In this paper, properties single-side brass foil laminated CC were evaluated. Cu-stabilized tape was externally reinforced differently by soldering laminate just either on the superconducting layer side or substrate one. Under uniaxial tension double bending, stress/strain dependences critical current, I <sub...
REBa 2 Cu 3 O 7-x (REBCO, RE = rare earth)-coated conductor is a competitive option in terms of current-carrying capacity and high-stress durability developing high-field magnets for nuclear magnetic resonance (NMR) research. Meanwhile, technical challenge utilizing stand-alone REBCO NMR magnet an unexpected difference the field uniformity between designed measured values after being constructed charged, i.e., harmonic errors. Bortot et al., Li reported analytic evidence related issue....
A conduction-cooled high-temperature superconducting magnet using 2nd generation HTS wire, which has a room-temperature bore 102 mm in diameter, been developed and tested up to 3 T with the operating temperature of 20 K. The consists 22 double pancake coils (DPCs) an inner diameter 140 outer 182 mm. Twenty-two were separately at 77 K for checking <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">IV</i> -curve. Selected DPCs resistively connected by...
With much effort devoted by many research groups, the performance of 2nd generation (2G) superconducting wires, also called coated conductors (CC), was drastically improved, leading to meaningful and impressive demonstrations electric power devices. Now that performances such as critical current, in-field characteristics, mechanical strengths became sufficient application, attention has moved how we can produce long 2G wires with high uniformity. Many in-line inspection tools are tested...
We study depth profiling of the microwave surface resistance (RS) GdBa2Cu3O7−δ (GdBCO) coated conductors (CCs) grown using reactive co-evaporation by deposition and reaction (RCE-DR) method, a method enabling extremely high rate. GdBCO CCs with critical current (IC) more than 790 A cm−1 at 77 K in self-field are used for study. The RS is measured temperatures 10–80 8.5 GHz TE011-mode rutile resonator, which compared that YBa2Cu3O7−δ films epitaxially on single crystal substrates. It turns...
We report on the influence of oxygen stoichiometry vortex creep mechanism GdBa2Cu3O x -coated conductors produced by co-evaporation. The films, x, was modified in a controlled way between 6.85 and 7, which resulted systematic reversible control superconducting critical temperature about 78 93 K. change produces strong reduction self-field current densities J c without significantly modifying power-law dependence at intermediate magnetic fields, indicates negligible contribution vacancies to...
We report the post-annealing effect on pinning properties of GdBa <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-δ</sub> (GdBCO) coated conductors (CCs) fabricated by a reactive co-evaporation deposition and reaction process. The GdBCO CCs annealed at 750 °C in PO 300 mtorr for 15 min show most enhanced critical current densities (J...
Competition between pinning produced by
We report the enhanced pinning properties of Sm-doped GdBa <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-δ</sub> (GdBCO) coated conductors (CCs) compared with those GdBCO CCs by reactive co-evaporation deposition and reaction process. For this paper, could be fabricated successfully using same processing parameters CCs. While exhibited...
In order to increase the current capacity of a high-temperature superconducting REBCO-coated conductor, in this paper, lighter aluminum alloy was employed for mechanical reinforcement. Two GdBCO tapes fabricated using reactive coevaporation by deposition and reaction (RCE-DR) process were laminated with three Al (AA-3104) two-step involving pretinning bonding. It confirmed that ultrasonic soldering Sn-3 wt% Ag-0.5 Cu efficient at laminating tapes. The bonding strengths critical currents...