A5011920585- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Magnetic and transport properties of perovskites and related materials
- Ionosphere and magnetosphere dynamics
- Atomic and Subatomic Physics Research
- Fusion materials and technologies
- Superconductivity in MgB2 and Alloys
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- ZnO doping and properties
- HVDC Systems and Fault Protection
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- Magnetic properties of thin films
- Nuclear Physics and Applications
- Mechanical stress and fatigue analysis
- Spectroscopy and Laser Applications
- Radiation Detection and Scintillator Technologies
- Magnetic Properties and Applications
- Calibration and Measurement Techniques
- Quantum, superfluid, helium dynamics
- Copper Interconnects and Reliability
Korea Institute of Fusion Energy
2010-2024
Korea Advanced Institute of Science and Technology
2018
The Graduate University for Advanced Studies, SOKENDAI
2018
National Institute for Fusion Science
2018
Korea University of Science and Technology
2016
Korea Electrotechnology Research Institute
2002-2013
The Korea Superconducting Tokamak Advanced Research (KSTAR) project is the major effort of national fusion programme Republic Korea. Its aim to develop a steady state capable advanced superconducting tokamak establish scientific and technological basis for an attractive reactor. parameters are: radius 1.8 m, minor 0.5 toroidal field 3.5 T plasma current 2 MA, with strongly shaped cross-section double null divertor. initial pulse length provided by poloidal magnet system 20 s, but can be...
The extensive design effort for KSTAR has been focused on two major aspects of the project mission - steady-state-operation capability and advanced tokamak physics. steady state aspect is reflected in choice superconducting magnets, provision actively cooled in-vessel components, long pulse current drive heating systems. incorporated features associated with flexible plasma shaping, double null divertor passive stabilizers, internal control coils a comprehensive set diagnostics. Substantial...
Mechanical and electromagnetic stresses are exerted on Bi2223∕Ag∕Ag alloy superconducting composite tapes during fabrication∕winding operation, which cause reduction in critical current when the Bi2223 filaments damaged. In damage process, thermally induced residual strain fracture of play a dominant role. The aim present work was to propose comprehensive method for estimation these values quantitative description relation applied bending∕tensile strain, examine accuracy comparison with...
The charge exchange spectroscopy (CES) system for the Korea Superconducting Tokamak Advanced Research (KSTAR) device is designed to obtain profiles of ion temperature and rotation velocity by using modulated neutral beam injection a background system. CES diagnostic will measure carbon other impurities, in conjunction with heating KSTAR. visible light from plasma be concentrated via collection optics, assembled, imaged onto quartz fibers. We show progress KSTAR including assembly, lens...
In superconducting cable applications using the HTS tapes, striation of ReBCO coated conductor (CC) is being considered to reduce ac loss. The coating film with laser patterned filaments has been tried. practical applications, striated CC tapes should also exhibit acceptable tolerance mechanical stress/strains. However, reports on electromechanical properties in bending or torsion mode are limited. this study, critical current degradation behavior Cu stabilized SmBCO pure was investigated a...
This paper reviews recent progress in research and development (R&D) of reactive co-evaporation for high performance REBCO coated conductors Korea. Two types methods were developed the deposition SmBCO GdBCO superconducting layers respectively on IBAD (Ion Beam Assisted Deposition)-MgO template Korean conductor project. Batch type equipment its processing at Korea Electrotechnology Research Institute (KERI) conjunction with Advanced Science Technology (KAIST), a very critical current...
An infrared (IR) thermography is the preferred diagnostic that can quantify heat flux by measuring surface temperature distributions of divertor plates. The IR successfully instrumented on Korea Superconducting Tokamak Advanced Research (KSTAR). In this study, finite volume method considered to solve conduction equations. 1D-, 2D-, and 3D models are developed compared with various calculation algorithms, such as Duhamel’s theorem THEODOR. These comparisons show good agreement. order acquire...
The superconducting Bi2223/Ag/Ag alloy composite tape specimens with a length 6 cm, composed of series circuit six local elements 1 were bent by 0.37% and 1.0% for measurement distributions the overall (6 cm) (1 critical transport current n-value. When damage amount was small (0.37% bending strain), measured currents described three parameter Weibull distribution function, while when large (1.0% those bimodal function. n-value in diagram versus both expressed regression curve as function...
The distribution of the normalized critical transport current (critical with respect to original value) Bi2223/Ag/Ag alloy composite tape under bending strain 0%–0.833% was studied experimentally and analytically. experimental results were analyzed by a modeling approach based on relation heterogeneous damage evolution current. main are summarized as follows. (1) measured values varying described well present approach. (2) When all specimens damaged at high strains (0.338%–0.833% in work),...
The residual strain change of Bi2212 and Ag during the cooling heating process in Bi2212/Ag/Ag alloy composite superconductor was studied. First, filaments at room temperature measured by x-ray diffraction method. Then, Young's moduli constituents (Bi2212 filaments, alloy) yield strains were estimated from analysis stress–strain curve, based on rule mixtures. Also, coefficient thermal expansion curve wire. From modeling using property values changes Bi2212, with revealed.
The collection optics designs are described for the Thomson scattering diagnostic of Korea superconducting tokamak advanced research (KSTAR) device. optical systems collecting light emission induced through interaction between plasma electrons and a laser beam key components system. A duo-lens system was examined, final were derived KSTAR.
An InfraRed imaging Video Bolometer (IRVB) was installed on KSTAR in 2012 having a ∼2 μm × 7 cm 9 Pt foil blackened with graphite and 5 mm aperture located 7.65 from the 16 12 channels time resolution of 10 ms. The IR camera an Indigo Phoenix (InSb, 320 256 pixels, 435 fps, <25 mK). In 2017, IRVB upgraded by replacing FLIR SC7600 640 512 105 area reduced approximately half to 3.5 mm, number quadrupled 32 24. A synthetic image derived using projection matrix for Scrape Off Layer Plasma...
Effect of filament configuration and heat treatment Bi2212/Ag round wire with low Ag ratio on the engineering critical current density (J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</sub> ) was reported. We have fabricated 557, 85 7, 121 7 wires different evaluated at various diameters. also changed parameters treatment. The effects maximum process temperature (T xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> )and soaking time T...
SmBa <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> (SmBCO) coated conductors were grown on IBAD-MgO templates the evaporation using a drum-in-dual-chambers (EDDC) deposition system. The material showed critical temperature of 93 ~ 94 K and current 200 250 A/cm-width at 77 in self-field. current-limiting properties local structure...
We present the anisotropy of current transport characteristics in Bi-2223/Ag multifilamentary tapes as a function temperature and external magnetic field. Angular dependence critical glass-liquid transition flux density are well described by model, taking into account misorientation grains with constant effective factor, γ. Furthermore, γ increases apparently and/or due to weak-link properties.
The endurance evaluation of HTS conductors for practical applications is necessary. mechanical properties and the critical current, I/sub c/, multifilamentary Bi-2223 superconducting tapes, externally reinforced with stainless steel foils, subjected to high cycle fatigue loading in longitudinal direction were investigated at 77 K. relations between applied stress amplitude life (S-N curves) obtained using its transport property was evaluated increase repeated cycles different amplitudes....
In the 2015 Annual Plasma Campaign of Korea Superconducting Tokamak Advanced Research (KSTAR), which mainly used neutral beam injection (NBI) as auxiliary heating, yield by Deuterium–Deuterium (D–D) fusion neutrons 2.45 MeV energy from KSTAR plasma was estimated to have reached about 1014 n/s. Apart primary goal, is production nuclear fusion, these may be in other applications such aerospace, defense, material, and electronic component research testing, well battery fuel cell fields...
SmBa <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> (SmBCO)-coated conductors were grown on IBAD-MgO templates by in-situ co-evaporation using a drum-in-dual-chambers system. The conductors, which had coating thickness of up to 3 μm, showed critical temperature 92 ~ 94 K and current 150 625 A/cm-w at 77 in self-field. phonon modes...