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Tojo, Hiroshi; Hatae, Takaki; Sakuma, Takeshi; Hamano, Takashi; Itami, Kiyoshi
no journal, ,
Takeuchi, Masaki; Sugie, Tatsuo; Ogawa, Hiroaki; Ishikawa, Masao; Shimada, Takahiko; Itami, Kiyoshi
no journal, ,
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 
m, excluding the low temperature range less than about 500 
C.
Ishikawa, Masao; Kondoh, Takashi
no journal, ,
Neutronic analysis is performed for in-situ calibration of the in-vessel neutron flux monitor in ITER, the Microfission Chamber (MFC). It is found that the rotation method is appropriate for full calibration because this method has the advantage that the calibration time can be shortened and all neutron flux monitors can be calibrated simultaneously. However, this method is not easy to compare with neutronic analysis. So, the point by point method should be performed prior to full calibration to check the accuracy of the MCNP model and for a mock up experiment of the full calibration. Cooling water in the blanket module could significantly affect the detection sensitivity. These results suggest cooling water should be filled in the blanket module in the same way as the ITER operations when the in-situ calibration is performed.
Arakawa, Hiroyuki; Sasao, Hajime; Kawano, Yasunori; Itami, Kiyoshi
no journal, ,
Yatsuka, Eiichi; Hatae, Takaki; Itami, Kiyoshi
no journal, ,
Hatae, Takaki; Yatsuka, Eiichi; Hayashi, Toshimitsu*; Ono, Takehiro; Kusama, Yoshinori
no journal, ,
A prototype YAG laser system for the edge Thomson scattering system in ITER has been newly developed. Performance of the laser amplifier was improved by using flow tubes made of samarium doped glass; the small signal gain reached 20 at its maximum. As a result, an output energy of 7.66 J at 100 Hz was successfully achieved, and the performance exceeded the target performance (5 J, 100 Hz).