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Power deposition outside the divertor in ASDEX Upgrade

The heat deposition outside the divertor region in ASDEX Upgrade was measured using thermography and Langmuir probes, as well as thermometry and cooling water calorimetry for a type-I ELMy H-mode discharge with low density ( ). The total deposited energy to non-divertor components was found to be below 8% of the total plasma energy throughput. The main part of this energy is deposited onto the low field side limiters. The radial heat flux deposition profile measured with an infrared camera at the protection limiter is the radial continuation of the heat flux profile measured in the lower outer divertor mapped to the mid-plane. Twenty-five per cent of the plasma energy loss by ELMs is detected at non-divertor components. The large area of the central column is loaded with about 10% and the ion cyclotron resonance heating and protection limiters with 15%. The ELM contribution to the non-divertor energy deposition is about 60% of the total non-divertor load. A systematic investigation of ELM energy deposition outside the divertor as a function of plasma and edge parameters is in progress.