Development of calibration method of divertor IR thermography for ITER

Takeuchi, Masaki; Sugie, Tatsuo; Takeyama, Shigeharu; Ogawa, Hiroaki; Itami, Kiyoshi

no journal, , 

In ITER, divertor IR thermography for measurement of surface temperature on divertor plates with high resolutions in both time and space has been designed by Japan. One of the issues is in-situ calibration of emissivity in IR light on the divertor plates, because the emissivity will change due to changes in surface properties caused by depositions and erosions. However, the in-situ calibration method has not been established yet. We recently conceived a new calibration method that an IR laser (quantum cascade laser) is irradiated to an observation surface and the emissivity will be evaluated from the scatter light. Therefore, laboratory experiments for development of calibration methods have been performed by using the components such as IR camera, heater, IR laser, black body source.

Development of calibration method for divertor IR thermography in ITER

Takeuchi, Masaki; Sugie, Tatsuo; Takeyama, Shigeharu; Ogawa, Hiroaki; Itami, Kiyoshi

no journal, , 

In ITER, divertor IR thermography for measurement of surface temperature on divertor plates with high resolutions in both time and space has been designed by Japan. One of the issues is in-situ calibration of emissivity in IR light on the divertor plates, because the emissivity will change due to changes in surface properties caused by depositions and erosions. However, the in-situ calibration method has not been established yet. We recently conceived a new calibration method that an IR laser (quantum cascade laser) is irradiated to an observation surface and the emissivity will be evaluated from the scatter light. Therefore, laboratory experiments for development of calibration methods have been performed by using the components such as IR camera, heater, IR laser, black body source.

Development of in-situ calibration method by using an IR laser for ITER divertor IR thermography

Takeuchi, Masaki; Sugie, Tatsuo; Takeyama, Shigeharu; Itami, Kiyoshi

no journal, , 

Development of high energy laser resistance beam dump for the ITER Edge Thomson Scattering

Yatsuka, Eiichi; Hatae, Takaki; Takeyama, Shigeharu; Bassan, M.*; Vayakis, G.*; Walsh, M.*; Itami, Kiyoshi

no journal, , 

In ITER, 10 pulses of 5-J laser will be injected during its operation for 20 years. It was concerned that the surface damage was induced due to high incident laser energy density if conventional beam dump would be used. JAEA has proposed and modified the detailed shape of a new type beam dump in which the laser energy is reflected numerous times and absorbed gradually due to low absorptance of the S-polarized light. The new type beam dump withstands 10 pulses injection while conventional beam dump withstands 10 pulses (100 seconds) injection. In order to verify this design for drastically extending the beam dump life time, laser resistance test for molybdenum that is the beam dump material was carried out. As expected in design, beam energy absorption density is dominant factor for laser induced damage. Moreover, it was confirmed that interlaminating the bent sheets and shims and their diffuse bonding enable to manufacture complicated shape of the beam dump as designed.

Development of divertor IR thermography for ITER

Sugie, Tatsuo; Takeuchi, Masaki; Takeyama, Shigeharu; Ishikawa, Masao; Shimada, Takahiko

no journal, , 

no abstracts in English