A5007456464- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Physics of Superconductivity and Magnetism
- Particle Accelerators and Free-Electron Lasers
- HVDC Systems and Fault Protection
- Fusion materials and technologies
- Spacecraft and Cryogenic Technologies
- Nuclear Physics and Applications
- Magnetic Properties and Applications
- Nuclear reactor physics and engineering
- Frequency Control in Power Systems
- Superconductivity in MgB2 and Alloys
- Gyrotron and Vacuum Electronics Research
- Magnetic Field Sensors Techniques
- Distributed and Parallel Computing Systems
- Wireless Power Transfer Systems
- Nuclear Materials and Properties
- Advanced Surface Polishing Techniques
- Advanced Battery Technologies Research
- Thermal Analysis in Power Transmission
- Erosion and Abrasive Machining
- Geophysics and Sensor Technology
- Advanced Numerical Analysis Techniques
- Magnetic and transport properties of perovskites and related materials
Korea Institute of Fusion Energy
2014-2024
Korea Advanced Institute of Science and Technology
2023
Fusion Academy
2016
Fusion (United States)
2016
Plasma Technology (United States)
2014
Massachusetts Institute of Technology
2014
Korea Institute of Ceramic Engineering and Technology
2007-2012
Korea Basic Science Institute
2003-2006
Samsung (South Korea)
2001-2002
Yonsei University
1999-2000
Since the successful first plasma generation in middle of 2008, three experimental campaigns were successfully made for KSTAR device, accompanied with a necessary upgrade power supply, heating, wall-conditioning and diagnostic systems. was operated toroidal magnetic field up to 3.6 T circular shaped plasmas current 700 kA pulse length 7 s, have been achieved limited capacity PF magnet supplies. The mission program is achieve steady-state operations high performance relevant ITER future...
As a sequel to our previous report on the key concept of multiwidth (MW) no-insulation (NI) winding technique that applies NI magnet assembly double-pancake (DP) coils wound with varying tape widths (thus MW), this paper presents construction and test results 7-T/68-mm cold-bore MW-NI GdBCO magnet. A total 13 DP were fabricated: five central 4.1-mm wide tape, while each remaining four pairs coils, axially symmetric midplane, was wound, from center end, 5.1-, 6.1-, 7.1-, 8.1-mm tapes. Each...
A decade-long operation of the Korean Superconducting Tokamak Advanced Research (KSTAR) has contributed significantly to superconducting tokamak devices and advancement physics which will be beneficial for ITER K-DEMO programs. Even with limited heating capability, various conventional as well new operating regimes have been explored achieved improved performance. As examples, a long pulse high-confinement mode without an edge-localized (ELM) crash was over 70 30 s, respectively. The unique...
Since the first H-mode discharges in 2010, duration of state has been extended and a significantly wider operational window plasma parameters attained. Using second neutral beam (NB) source improved tuning equilibrium configuration with real-time control, stored energy Wtot ∼ 450 kJ achieved corresponding confinement time τE 163 ms. Recent discharges, produced fall 2012, have reached βN up to 2.9 surpassed n = 1 ideal no-wall stability limit computed for pressure profiles, which is one key...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> To protect the KSTAR (Korea Superconducting Tokamak Advanced Research) superconducting coils against a quench, quench detection system based on voltage measurement was fabricated. It used detect/dump scheme which detects presence of non-recovering normal zones and activates dump circuit that transfers most stored energy into resistor. Even though it is desirable to discharge coil as fast possible...
Two types of shaking coils are focused on reducing screening currents induced in solenoid wound with high-temperature superconducting (HTS) tapes. One is a pair copper coaxially located inside and outside the HTS coil to apply an ac magnetic field axial direction. The other notch only minimize radial components local fields applied windings as small possible. It found that yield allowable amount power dissipation liquid helium. effectiveness reduce screening-current-induced generated by...
The aim of the Korea superconducting tokamak advanced research (KSTAR) project is to develop a steady-state-capable for establishing scientific and technological basis an attractive fusion reactor. Since KSTAR mission includes achievement operation, use coils obvious choice magnet system. system consists 16 toroidal field (TF) 14 poloidal (PF) which include 8 central solenoid coils. Both TF PF coil systems internally-cooled cable-in-conduit conductors (CICC). provides magnetic 3.5 T at...
Due to the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="TeX">$>$</tex-math></inline-formula> 100 times higher thermal stability of high temperature superconductor (HTS) than that low (LTS) and capability HTS be operated at a liquid-helium-free temperature, an cable is being considered possible alternative LTS for fusion magnets such as Toroidal Field (TF) coils in Tokamaks, Helical Stellarators. This paper...
The size effects of a precursor Y2BaCuO5 (Y211) powder on the microstructure and critical current density (Jc) liquid infiltration growth (LIG)-processed YBa2Cu3O7−y (Y123) bulk superconductors were investigated in terms milling time (t). Y211 powders attrition-milled for 0–10 h 2 h increments at fixed rotation speed 400 rpm. pre-forms made by pelletizing milled followed subsequent sintering, after which an LIG process with top seeding was applied to Y211/Ba3Cu5O8 (Y035) pre-forms. Spherical...
Full transposition of superconducting wires within a conductor may not be requirement for high temperature superconductor (HTS) magnet fusion applications. Already, conduction-cooled 20 T model coil built with non-transposed HTS stacks has been demonstrated by Commonwealth Fusion Systems (CFS). Here, we discuss 3 possible stacked cryogen-cooled concepts toroidal field (TF) The first one is somewhat like LTS conductors, the second, are capped copper stabilizer, last one, only without copper....
This paper deals with the analysis of electromagnetic and mechanical properties a high-temperature superconducting (HTS) coil, as well its characteristic determined through tests using strain gauges. When an operating current is applied to HTS generated by force. However, additional effects in coil are formed Joule heating during quench. Strain was measured full-bridge gauge mounted directly over turns. We fabricated wound single pancake type investigate characteristics. also investigated...
The 16 T superconducting magnet for the next generation fusion reactor, called K-DEMO would be a great engineering challenge with current technology. project on test facility, named SUCCEX (Super Conducting Conductor Experiment) is prerequisite development of magnet. It generate an external magnetic field developing and testing superconductors. Also, this will give guideline to fabricate future conductors nuclear reactor construction. essential facility production magnets K-DEMO. In 2021,...
The KSTAR Central Solenoid Model Coils (CSMC), which are in the form of split coils with same dimension, have been tested. CSMC were successfully charged up to 20 kA and down zero different ramp rates. Various pulse waveforms applied analyse AC-loss characteristics coils. measurement method was a gas-flow calorimetry. In this work, two types waveforms, DC-biased sinusoidal wave ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$I_dc = 2$</tex> ,...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The cryogenic system for the KSTAR superconducting magnets has been commissioned. It consists of a cold box, distribution boxes (DB) and transfer lines. box DB #1 provide 600 g/s supercritical helium to cool (SC) magnets, their SC bus-lines, magnet support structures. also provides 17.5 liquid current leads supplies flow thermal shields. main duties #2 are relative among cooling channels each...
KSTAR is a fully superconducting tokamak in operation since 2008 at the National Fusion Research Institute Korea. All coils are wound using cable-in-conduit conductors and cooled with forced-flow supercritical helium 4.5 K 5.5 bar. We consider here central pair, PF1U/L, of solenoid coils; during operation, these subjected to sharp current transients, which induce ac losses coil. The thermal hydraulic transient following trapezoidal pulse, ramp-up 10 kA rate 1 kA/s ramp-down 0 kA/s, simulated...
Voltage-based QD is the primary way to guarantee that magnets can be protected against overheating because of its fastest response. However, central solenoid (CS) and poloidal field (PF) coils are operated in pulse currents, so resultant inductive voltages could hundred times higher than quench detection voltage thresholds. For this reason, some compensation techniques have been adopted discriminate quench-induced resistive from induced by self mutual inductances between coils. Cowound...