Two-wavelengths digital holography for erosion measurements inside the ITER Tokamak

The International Thermonuclear Experimental Reactor (ITER) Project is the next step in the transition from experimental studies of plasma physics to full-scale electricity-producing fusion power stations. There is a need for the regular measuring of the erosion and deposition at the wall once the reactor starts operating. An erosion and deposition monitor able to measure the changes in the surface shape is planned. We have shown that long distance shape measurements in challenging environmental conditions (strong vibrations) can be done by two-wavelength digital holography and thus this technique could be used for the erosion monitoring inside the ITER-Tokamak.