Development of divertor IR thermography for ITER

Takeuchi, Masaki; Sugie, Tatsuo; Ogawa, Hiroaki; Ishikawa, Masao; Shimada, Takahiko; Kusama, Yoshinori

In ITER project, it reports on the progress of the conceptual design of Divertor IR Thermography which is one of the diagnostics Japan is in charge of development. The conceptual design of the optical system was done based on the measurement requirement, and the performance was evaluated. The angle of field of view is 2.5 degree for the outer divertor and 4.0 degree for the inner divertor, therefore wide fields of view are achieved. The spatial resolution fills 3 mm of the measurement requirement in the center field of view though it depends on the observed wavelength. Moreover, nuclear heating of mirrors in the optical system is 0.1 W / cc excluding the first mirror. The prospect that the mirrors can be cooled is obtained. Future tasks include optimization of the optical system that spatial resolution coexists with neutron shielding, development of calibration method and the mechanical designs of shutters and mirror holders.