Verification of optical fiber current transformer in nuclear fusion experimental device

Nishiyama, Tomokazu; Arai, Takashi; Hayashi, Takao; Yagyu, Junichi; Miya, Naoyuki; Abe, Mitsushi*

Dai-32-Kai Koha Senshingu Gijutsu Kenkyukai Koen Rombunshu, p.147 - 152, 2003/00

In a nuclear fusion equipment device, plasma discharges are expected to become a long time. In such a device an electromagnetic sensor that has a signal integrator to measure direct currents will cause a technical problem of zero point drift on signals. Furthermore, the development for solving the problem cause cost rise. Therefore, the detection device using new technology for direct current measurement, optical fiber current transformer (optical CT), was developed. Direct-current measurement of JT-60 was carried out using this detection device. A ray irradiation examination was also done to the optical CT.