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Report No.
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Development of divertor IR thermography for ITER

Takeuchi, Masaki; Sugie, Tatsuo; Ogawa, Hiroaki; Ishikawa, Masao; Shimada, Takahiko; Itami, Kiyoshi

The development of Divertor IR Thermography which is one of the diagnostics Japan will procure in ITER project has been advanced. The system design, the optical design and the evaluation of detected photons was performed based on the measurement requirements. The detection system consists of the two color system and the spectroscopic system. There are two optical paths for inner and outer divertor to satisfy the spatial resolution of 3 mm. By making dogleg structures, the shut down dose rate in the inter space was reduced by half from that of previous optical design. In the case of low emissivity as like tungsten, the detected photons were evaluated. Higher photons than the bremsstrahlung light are obtained in the wavelength of 3 and 5 $$mu$$m, excluding the low temperature range less than about 500 $$^{circ}$$C.

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