Abstract
The plasma current position is measured based on the current multipole moment method in the Korea Superconducting Tokamak Advanced Research (KSTAR) device [G. S. Lee et al., Nucl. Fusion 41, 1515 (2001)]. Since a limited number of magnetic probes and flux loops were installed for the first campaign, an iteration method is used to interpolate the magnetic field in the area absent of probes. A numerical technique is developed which automatically compensates for the linear drift of the integrator. The measured plasma position is cross checked with the charge coupled device images. In KSTAR, the plasma current is displaced toward the lower outboard direction during the current initiation phase. This displacement is expected due to eddy currents but the exact amount and direction needs more study.
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