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15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 15), Gifu, 2002-05-26 to 2002-05-31
Abstract:
Thermography is applied on the stellarator W7-AS to monitor the thermal load of the recently
installed divertor targets. A three dimensional numerical code was developed to evaluate power
fluxes arriving at the targets from the measured temporal evolution of the surface temperature
distribution. Values of the thermal conductivity of the used CFC-target material for all three
directions are required for this evaluation and determined by observing the propagation of controlled
heat pulses applied by an infrared laser. The evaluation of the thermographic measurements during
plasma operation shows characteristic spatial and temporal features of the arrived heat fluxes.
Significant features in high density regimes like plasma detachment from the divertor target plates or
strongly enhanced localised plasma radiation (MARFE) has been observed by the installed infrared
cameras. The implications of these observations for the thermographic system for W7-X are shortly
addressed.
