サニャック干渉型光電流変成器(CT)によるプラズマ電流計測

概要

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An optical fiber current transformer(CT)using a Sagnac interferometer was developed. The CT is based on the Farady effect and detects the phase difference between circular polarization lights propagating in the Sagnac loop. The maximum measurable current and the time resolution were designed to be 30 kA and about 2 ms, respectively. Measurement test in a dummy coil showed good linearity for both DC and AC(50 Hz)current. The CT was applied on the plasma current measurement at the Hitachi tokamak(HT-2). Experimental results showed that the CT could detect the plasma current within a linearity error of 3%. No undesirable DC drift was observed during a 2-hour continuous measurement and it was concluded that the CT could be applied to steady state fusion devices for current measurements.
社団法人プラズマ・核融合学会の論文
2000-06-25