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(FTP1/10) Optical Fibers for Application in Diagnostics for Burning Plasmas

T. Shikama¹⁾, T. Kakuta²⁾, T. Nishitani³⁾, S. Kasai³⁾, S. Yamamoto⁴⁾, N. Shamoto^5)
 
2) Tokai Research Establishment, JAERI, Tokai, Ibaraki, 319-1195 Japan
³⁾ Naka Fusion Research Establishment, Naka, Ibaraki, 311-0193
⁴⁾ ITER-JCT, Garching, near Munich, D-85748, Germany
⁵⁾ Optics and Electronics Lab., Fujikura Ltd., 285-8550, Sakura, Japan

Abstract.  Attempts have been made to develop fused-silica-core optical fibres which can be used in burning plasma fusion devices such as International Thermonuclear Experimental Reactor (ITER). Nine kinds of silica core optical fibres were developed and irradiated in a high flux fission reactor. A transmission loss of one of fluorine doped optical fibre, F-4, was less than 20 dB/m at 630nm even at the end of irradiation where a total ionizing irradiation dose was above 10⁹Gy and a fast neutron fluence was above 10²³n/m². These irradiation parameters will be corresponding to those for the ITER-Engineering-Phase radiation parameters near its core region. The results showed that optical fibres could be applied near to burning plasma for visible as well as infrared diagnostics.

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