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Electric Resistance Measurement of the KSTAR Superconducting Coils With Small Resistive Joints
- Source :
- IEEE Transactions on Applied Superconductivity. 22:4803704-4803704
- Publication Year :
- 2012
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2012.
-
Abstract
- An electric resistance of lap joints assembled with Korea Superconducting Tokamak Advanced Research (KSTAR) poloidal field 1 (PF1) superconducting coils and bus lines was measured by 4-wire method with some improvements to reduce induced noise in measurements at cryogenic temperature. Generally, a large current has to flow through the joints in order to measure its resistance by electrical methods; however, an induced voltage generated by a DC power supply is much higher than a voltage drop on the joints. The improved method used a bypass resistor installed in parallel to the DC power supply and the coils in order to naturally reduce ripples of the coil current. Transitional waveforms of the coil current and tap voltages were approximated by non-linear curve fitting with constraints based on an electric circuit equation. The resistance and inductance were evaluated by solving simultaneous equations of an applied voltage on the conductors. The induced noise reduction by this method was helpful to evaluate the joint resistance.
- Subjects :
- Materials science
Acoustics
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
law.invention
Inductance
Nuclear magnetic resonance
Electrical resistance and conductance
Electromagnetic coil
law
KSTAR
Electrical and Electronic Engineering
Resistor
Electrical conductor
Voltage drop
Voltage
Subjects
Details
- ISSN :
- 15582515 and 10518223
- Volume :
- 22
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Applied Superconductivity
- Accession number :
- edsair.doi...........baaaab384af28443ae1a90d2f54bed84
- Full Text :
- https://doi.org/10.1109/tasc.2011.2180877