• 2154 Citations
  • 21 h-Index
1987 …2019
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Research Output 1987 2019

2019
1 Citation (Scopus)

Analysis of magnetic field harmonics change due to manufacturing error in air-core HTS quadruple magnet

Kim, J., Baek, G., Lee, J., Choi, Y., Han, S., Song, S. & Ko, T. K., 2019 Mar 1, In : Cryogenics. 98, p. 39-46 8 p.

Research output: Contribution to journalArticle

Superconducting magnets
superconducting magnets
manufacturing
Magnetic fields
harmonics

A new quench protection system using dual-capacitor switching for fast energy extraction from HTS magnets

Choi, Y., Lee, W. S., Song, S., Jeon, H. & Ko, T. K., 2019 Aug 1, In : IEEE Transactions on Applied Superconductivity. 29, 5, 8691554.

Research output: Contribution to journalArticle

Magnets
capacitors
Capacitors
magnets
Superconducting magnets

A Novel Magnetic Field Active Shim Method for Air-Core Higherature Superconducting Quadruple Magnet

Kim, J., Baek, G., Lee, W. S., Lee, S., Zhang, Z. & Ko, T. K., 2019 Aug 1, In : IEEE Transactions on Applied Superconductivity. 29, 5, 8654673.

Research output: Contribution to journalArticle

Shims
Superconducting magnets
superconducting magnets
Magnetic fields
air

Charging Characteristics of Rotary HTS Flux Pump with Several Superconducting Wires

Han, S., Lee, J., Jeon, H., Kim, H. M., Kim, J. H., Jo, Y. S., Kim, H. W., Ko, T. K. & Yoon, Y. S., 2019 Aug 1, In : IEEE Transactions on Applied Superconductivity. 29, 5, 8653858.

Research output: Contribution to journalArticle

flux pumps
Superconducting wire
Electromotive force
charging
Pumps

Effect of Crossover Turns in Double-Pancake Winding on Magnetic Field Homogeneity of HTS NMR Magnet

Baek, G., Lee, J., Lee, W. S., Yoon, Y. S. & Ko, T. K., 2019 Aug 1, In : IEEE Transactions on Applied Superconductivity. 29, 5, 4300505.

Research output: Contribution to journalArticle

Magnetic resonance spectrometers
homogeneity
Magnets
crossovers
magnets

Fabrication and Charging Test of HTS Field Windings Using HTS Contactless Rotary Excitation Device

Kim, J. H., Quach, H. L., Boo, C. J., Yoon, Y. S., Jeon, H., Han, S., Ko, T. K., Kim, H. W., Jo, Y. S., Park, H. J., Lee, J., Lee, H. & Kim, H. M., 2019 Aug 1, In : IEEE Transactions on Applied Superconductivity. 29, 5, 8661675.

Research output: Contribution to journalArticle

charging
Rotors
Pumps
Fluxes
Fabrication
2018

Analysis of Voltage Noises for the Reliability Improvement of the KSTAR CS Quench Detection

Baek, G., Kim, J., Kang, H., Ko, T. K. & Chu, Y., 2018 Jun 1, In : IEEE Transactions on Applied Superconductivity. 28, 4, 4701904.

Research output: Contribution to journalArticle

Korea
Solenoids
solenoids
Electric potential
electric potential

Analytic Study of the Active Quench Detection Method for High-Temperature Superconducting Magnet Using Resonance Circuit

Song, S., Choi, Y., Lee, W. S., Sim, K., Hwang, Y. J., Jang, J. Y., Kang, H. & Ko, T. K., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 4701304.

Research output: Contribution to journalArticle

Circuit resonance
High temperature superconductors
Superconducting magnets
superconducting magnets
high temperature superconductors
2 Citations (Scopus)

Characteristic Analysis of a 1-kW-Class HTS Motor Considering Armature Current Information

Kim, J. H., Hyeon, C. J., Quach, H. L., Chae, S. H., Lee, J., Jeon, H., Han, S., Ko, T. K., Yoon, Y. S., Kim, H. W., Jo, Y. S. & Kim, H. M., 2018 Jun 1, In : IEEE Transactions on Applied Superconductivity. 28, 4, 5207205.

Research output: Contribution to journalArticle

armatures
Torque
Synchronous motors
Inductance
torque
1 Citation (Scopus)

Comparative Study of Magnetic Characteristics of Air-Core and Iron-Core High-Temperature Superconducting Quadrupole Magnets

Lee, J., Kim, J., Baek, G., Choi, Y., Choi, Y. H., Zhang, Z., Do Chung, Y., Kang, H., Lee, H., Lee, S. & Ko, T. K., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 8234611.

Research output: Contribution to journalArticle

Magnets
magnets
Iron
quadrupoles
High temperature superconductors
3 Citations (Scopus)

Degradation of critical current in an HTS coated conductor considering curvature of ellipse for rotating flux pump

Han, S., Lee, J., Jeon, H., Ko, T. K., Kim, H. M., Kim, J. H., Hyeon, C. J. & Yoon, Y. S., 2018 Jan 1, In : Cryogenics. 89, p. 141-146 6 p.

Research output: Contribution to journalArticle

flux pumps
Critical currents
ellipses
ellipsoids
Phosmet
1 Citation (Scopus)

Degradation of Critical Current in an HTS Tape with Combined Bending and Torsion Considering Curvature of Elliptical Shape

Han, S., Lee, J., Jeon, H., Kim, J. H., Hyeon, C. J., Kim, H. M., Kang, H., Ko, T. K. & Yoon, Y. S., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 8186202.

Research output: Contribution to journalArticle

Superconducting tapes
Critical currents
Torsional stress
tapes
torsion

Design and Comparative Analysis for Air-Core and Iron-Core LTS Quadruple Magnet

Kim, J., Baek, G., Ko, T. K., Zhang, Z. & Lee, S., 2018 Nov 27, ICEMS 2018 - 2018 21st International Conference on Electrical Machines and Systems. Institute of Electrical and Electronics Engineers Inc., p. 922-926 5 p. 8548979

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Superconducting materials
Magnets
Iron
Air
Temperature
5 Citations (Scopus)

Experimental Analysis of Charging Characteristics of HTS Field Coils with HTS Contactless Rotary Excitation Device Considering Various HTS Loads

Lee, J., Jeon, H., Han, S., Kim, J. H., Hyeon, C. J., Kim, H. M., Ko, T. K., Park, D. K. & Yoon, Y. S., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 8264767.

Research output: Contribution to journalArticle

field coils
strands
rotors
charging
Rotors
6 Citations (Scopus)

Methods for Increasing the Saturation Current and Charging Speed of a Rotary HTS Flux-Pump to Charge the Field Coil of a Synchronous Motor

Jeon, H., Lee, J., Han, S., Kim, J. H., Hyeon, C. J., Kim, H. M., Park, D., Do Chung, Y., Ko, T. K. & Yoon, Y. S., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 8259254.

Research output: Contribution to journalArticle

flux pumps
synchronous motors
field coils
Synchronous motors
Tapes
5 Citations (Scopus)

PID Control of an Electromagnet-Based Rotary HTS Flux Pump for Maintaining Constant Field in HTS Synchronous Motors

Jeon, H., Lee, J., Han, S., Kim, J. H., Hyeon, C. J., Kim, H. M., Kang, H., Ko, T. K. & Yoon, Y. S., 2018 Jun 1, In : IEEE Transactions on Applied Superconductivity. 28, 4, 5207605.

Research output: Contribution to journalArticle

flux pumps
synchronous motors
Electromagnets
electromagnets
Synchronous motors
2017

A comparison on the heat load of HTS current leads with respect to uniform and non-uniform cross-sectional areas

Han, S., Nam, S., Lee, J., Song, S., Jeon, H., Baek, G., Kang, H. & Ko, T. K., 2017 Sep 1, In : Progress in Superconductivity and Cryogenics (PSAC). 19, 3, p. 44-48 5 p.

Research output: Contribution to journalArticle

High temperature superconductors
Thermal load
Lead
Metals
Superconducting magnets

Analysis of the Dielectric Characteristics of Gaseous Nitrogen According to Various Temperatures and Pressures for a Magnet System

Nam, S., Lee, W. S., Lee, H., Kang, J. O., Kim, J., Mo, Y. K., Bang, S., Lee, O., Kang, H. & Ko, T. K., 2017 Aug 1, In : Journal of Superconductivity and Novel Magnetism. 30, 8, p. 2347-2352 6 p.

Research output: Contribution to journalArticle

Electric breakdown
electrical faults
Magnets
Nitrogen
magnets
2 Citations (Scopus)

A study on the YBCO-Coated conductor current lead with asymmetric structure tape considering temperature distribution

Nam, S., Lee, W. S., Lee, J., Jeon, H., Han, S., Choi, Y., Lee, J. & Ko, T. K., 2017 Jun 1, In : IEEE Transactions on Applied Superconductivity. 27, 4, 7839932.

Research output: Contribution to journalArticle

Tapes
tapes
Superconducting materials
Temperature distribution
temperature distribution
1 Citation (Scopus)

Energy extraction system using dual-capacitor switching for quench protection of HTS magnet

Choi, Y., Lee, W. S., Song, S., Jeon, H., Kang, H. & Ko, T. K., 2017 Sep 1, In : Progress in Superconductivity and Cryogenics (PSAC). 19, 3, p. 49-53 5 p.

Research output: Contribution to journalArticle

Magnets
Capacitors
Resistors
Superconducting magnets
Electric potential
1 Citation (Scopus)

Field gradient calculation of HTS double-pancake coils considering the slanted turns and the splice

Baek, G., Kim, J., Lee, W. S., Song, S., Lee, O., Kang, H. & Ko, T. K., 2017 Mar 1, In : Progress in Superconductivity and Cryogenics (PSAC). 19, 1, p. 51-55 5 p.

Research output: Contribution to journalArticle

Magnets
Nuclear magnetic resonance
Magnetic resonance spectrometers
Temperature
Magnetic resonance measurement
1 Citation (Scopus)

Investigation of electrical characteristics of no-insulation coil wound with surface-processed HTS tape

Jeon, H., Lee, W. S., Kim, J., Baek, G., Jeon, S., Yoon, Y. S. & Ko, T. K., 2017 Aug 15, In : Physica C: Superconductivity and its Applications. 539, p. 25-29 5 p.

Research output: Contribution to journalArticle

insulation
Tapes
tapes
Insulation
coils
1 Citation (Scopus)

Study on Quench Detection of the KSTAR PF Coils Using Numerical Compensation of Inductive Voltages with Genetic Algorithm

Kim, J., An, S. C., Choi, Y., Ko, T. K. & Chu, Y., 2017 Jun 1, In : IEEE Transactions on Applied Superconductivity. 27, 4, 7778126.

Research output: Contribution to journalArticle

field coils
Korea
genetic algorithms
Genetic algorithms
Electric potential
2016
1 Citation (Scopus)

Analysis of the Notch Effect on Flux Diverters for High-Temperature Superconducting Magnets

Song, S., Lee, W. S., Park, Y. G., Nam, S., Jeon, H., Baek, G., Ahn, M. C., Lee, J., Choi, Y. & Ko, T. K., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7431974.

Research output: Contribution to journalArticle

diverters
Superconducting magnets
superconducting magnets
notches
Critical currents
1 Citation (Scopus)

A simulation study on the variation of virtual NMR signals by winding, bobbin, spacer error of HTS magnet

Kim, J., Lee, W. S., Kim, J., Song, S., Nam, S., Jeon, H., Baek, G. & Ko, T. K., 2016 Sep 1, In : Progress in Superconductivity and Cryogenics (PSAC). 18, 3, p. 21-24 4 p.

Research output: Contribution to journalArticle

Bobbins
High temperature superconductors
Magnets
Nuclear magnetic resonance
Tapes

Design and Test of HTS Power Converting System with Multiple Magnets Considering Various Sequential Controls of Heater-Triggered Switches

Lee, J., Park, Y. G., Jo, H. C., Kim, H. M., Chung, Y. D., Chu, Y., Ko, T. K. & Yoon, Y. S., 2016 Apr 1, In : IEEE Transactions on Applied Superconductivity. 26, 3, 7420669.

Research output: Contribution to journalArticle

sequential control
heaters
Magnets
magnets
switches

Discharge Voltage Effects on High-TC Superconducting Tapes with Respect to Tensile Stress

Nam, S., Lee, W. S., Lee, H., Kang, J. O., Kim, J., Mo, Y. K., Bang, S., Lee, O., Kang, H. & Ko, T. K., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7429707.

Research output: Contribution to journalArticle

Superconducting tapes
tensile stress
Tensile stress
tapes
Electric breakdown
2 Citations (Scopus)

Experimental Analysis of Thermally and Magnetically Triggered Switch for High-Tc Superconducting Power Converting System

Lee, J., Kim, J., Kim, J., Park, Y. G., Lee, W. S., Lee, J., Chung, Y. D., Yoon, K. Y., Kim, H. M., Yoon, Y. S. & Ko, T. K., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7399360.

Research output: Contribution to journalArticle

switches
Switches
heaters
charging
Deep Space 1 Mission
4 Citations (Scopus)

Experimental Analysis on AC Loss and Fault Current Test of HTS Coils Co-Wound with Various Inserted Materials

Kim, J., Nam, S., Jeon, H., Kim, J., Jang, J. Y. & Ko, T. K., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7416632.

Research output: Contribution to journalArticle

Electric fault currents
alternating current
coils
Insulation
Superconducting fault current limiters
insulation
Insulation
coils
tapes
Temperature

Magnetic Field Stability Analysis on No-Insulation and Turn-to-Turn Soldered HTS Magnets under Sinusoidal Noise Operation

Lee, W. S., Park, Y. G., Kim, J., Song, S., Jeon, H., Kim, Y. G., Lee, H. & Ko, T. K., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7378409.

Research output: Contribution to journalArticle

Superconducting magnets
superconducting magnets
insulation
Insulation
Magnetic fields
Electric potential
Inductance
Compensation and Redress
2 Citations (Scopus)

Operational Characteristics of HTS Coils with Flux Diverters in Semipersistent Mode under Alternating Magnetic Field

Park, Y. G., Lee, W. S., Lee, J., Song, S., Hwang, Y. J., Chung, Y. D. & Ko, T. K., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7434615.

Research output: Contribution to journalArticle

diverters
field coils
coils
Pulse code modulation
Magnetic fields

Quench analysis and protection circuit design of a superconducting magnet system for RISP 28GHz ECR ion source

Song, S., Ko, T. K., Choi, S. & Ahn, M. C., 2016 Jan 1, In : Progress in Superconductivity and Cryogenics (PSAC). 18, 2, p. 37-41 5 p.

Research output: Contribution to journalArticle

Electron cyclotron resonance
Superconducting magnets
Ion sources
Magnets
Networks (circuits)
2 Citations (Scopus)

Study on quench detection of the KSTAR CS coil with CDA+MIK compensation of inductive voltages

An, S. C., Kim, J., Ko, T. K. & Chu, Y., 2016 Mar 1, In : Progress in Superconductivity and Cryogenics (PSAC). 18, 1, p. 55-58 4 p.

Research output: Contribution to journalArticle

Electric potential
Magnets
Bridge circuits
Compensation and Redress
Networks (circuits)
2 Citations (Scopus)

Test and Analysis of Electromagnetic and Mechanical Properties of HTS Coil during Quench State

Park, Y. G., Jo, H. C., Lee, J., Kim, H. M., Chung, Y. D., Chu, Y., Yoon, K. Y., Ko, T. K. & Yoon, Y. S., 2016 Apr 1, In : IEEE Transactions on Applied Superconductivity. 26, 3, 4602104.

Research output: Contribution to journalArticle

electromagnetic properties
coils
mechanical properties
Mechanical properties
strain gages
2015

A feasibility study of full-bridge type superconducting fault current controller on electric machine power stability

Jang, J. Y., Hwang, Y. J., Lee, J. & Ko, T. K., 2015 Dec 21, In : Superconductor Science and Technology. 29, 2, 025011.

Research output: Contribution to journalArticle

Electric machinery
Electric fault currents
controllers
Controllers
Fault current limiters
5 Citations (Scopus)

Analysis of a High-Tc Superconducting Power Converting System

Yoon, Y. S., Jo, H. C., Park, Y. G., Lee, J., Yoon, K. Y., Kim, H. M., Chung, Y. D., Chu, Y. & Ko, T. K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 7053951.

Research output: Contribution to journalArticle

coils
Magnets
Copper
Superconducting tapes
charging
1 Citation (Scopus)

Analysis of the current charge and discharge characteristics of a small-scale turn-to-turn soldered HTS coil

Lee, W. S., Lee, J., Song, S., Park, Y. G., Jin, H., Hahn, S., Ahn, M. C. & Ko, T. K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 7042729.

Research output: Contribution to journalArticle

coils
Soldering
charging
soldering
Temperature
1 Citation (Scopus)
Tapes
tapes
numerical analysis
temperature dependence
superconducting devices
4 Citations (Scopus)

Degradation characteristics of superconducting wires with respect to electrical breakdown tests

Kang, J. O., Lee, O., Bang, S., Kim, J., Lee, H., Hong, J., Nam, S., Ko, T. K., Chung, Y. D. & Kang, H., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6985556.

Research output: Contribution to journalArticle

Superconducting wire
electrical faults
wire
degradation
Degradation
6 Citations (Scopus)

Dielectric characteristics of solid insulation materials with respect to surface roughness

Kim, Y. H., Lee, H., Lee, O., Kim, J., Bang, S., Kang, J. O., Hong, J., Nam, S., Ko, T. K. & Kang, H., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6971148.

Research output: Contribution to journalArticle

insulation
Insulation
surface roughness
Surface roughness
Bakelite (trademark)

Effects of AC disturbance on cowinding HTS coils according to the inserted materials

Kim, J., Hwang, Y. J., Lee, W. S., Lee, T. S., Lee, J. & Ko, T. K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 7001577.

Research output: Contribution to journalArticle

Insulation
alternating current
disturbances
coils
Tapes
3 Citations (Scopus)

Evaluation of Electrical and Thermal Properties of Stacked YBCO Coated Conductors for Current Lead Application

Park, Y. G., Lee, W. S., Kim, H., Chung, Y. D., Yoon, Y. S. & Ko, T. K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6995943.

Research output: Contribution to journalArticle

Electric properties
Thermodynamic properties
conductors
thermodynamic properties
electrical properties
11 Citations (Scopus)

Experimental analysis on initial current decay characteristics of persistent-mode HTS coil by external alternating magnetic field

Park, Y. G., Lee, C. Y., Lee, J., Nam, S., Chung, Y. D., Yoon, Y. S. & Ko, T. K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6975064.

Research output: Contribution to journalArticle

coils
Magnetic fields
decay
field coils
magnetic fields
1 Citation (Scopus)

Fabrication and experimental analysis of 6.6 kV/100 a class single-phase superconducting fault current controller with superconducting DC reactor coil

Lee, J., Lee, W. S., Nam, S., Kim, J., Lee, S., Ahn, M. C., Park, Y. G., Song, S., Lee, J., Jin, H., Kim, H., Kim, S., Hur, K. & Ko, T. K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6966739.

Research output: Contribution to journalArticle

Electric fault currents
controllers
coils
direct current
reactors
5 Citations (Scopus)

HTS coil with enhanced thermal stability in over-current operation for fast response magnet power application

Kim, H., Kim, J., Lee, J. & Ko, T. K., 2015 Aug 24, In : Superconductor Science and Technology. 28, 10, 105006.

Research output: Contribution to journalArticle

Magnets
Thermodynamic stability
thermal stability
magnets
coils
7 Citations (Scopus)

Jointless pancake coil winding for minimizing electrical loss in HTS SMES for wind power

Kang, J., Ko, T. K., Al-Ammar, E. A. & Hur, K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 7006688.

Research output: Contribution to journalArticle

Wind power
coils
soldering
Soldering
Cryogenics
4 Citations (Scopus)

Operational characteristics of a small-scale novel hybrid resistive-type SFCL with controlled power electronics

Nam, S., Lee, J., Lee, W. S., Park, Y. G., Song, S., Jin, H. & Ko, T. K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 7015566.

Research output: Contribution to journalArticle

Superconducting fault current limiters
Electric fault currents
Power electronics
Thyristors
thyristors
1 Citation (Scopus)

Proof-of-concept of a millisecond-scale electromagnetic levitator using high-temperature superconducting coils

Lee, J., Nam, S., Song, S., Jin, H. & Ko, T. K., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6983590.

Research output: Contribution to journalArticle

Magnetic flux
coils
magnetic flux
electromagnetism
Aluminum