Abstract
In this work we analyse the effect of W armour surface shaping on the heat load on the W/EUROFER DEMO sandwich type first wall blanket module with the water coolant. The armour wetted area is varied by changing the inclination and height of the «roof» type armor surface. The deleterious effect of leading edge at the tiles corner caused by misalignment is replaced in current design by rounded corners. Analysis has been carried out by means of the MEMOS code to assess the influence of the thickness of the layers and effect of the magnetic field inclination. Calculations show the evolution of the maximum temperatures in the tungsten, EUROFER, Cu allow and the stainless-steel water tube for different level of surface inclination (chamfering) and in the case of rounded corners used in the current design. It is shown that the blanket module materials remain within a proper temperature range only at shallow incident angle if the width of EUROFER is reduced at list twice compare with the reference case.
Highlights
The thermal energy stored in the DEMO1 inductive operation is about four times higher than in ITER
In DEMO energy density deposition to the first wall (FW) panels, divertor plates etc. will be much higher than that foreseen in ITER [1]
The two adjacent cassettes of the DEMO FW blanket modules facing plasma are shown in the Fig. 1
Summary
The thermal energy stored in the DEMO1 inductive operation is about four times higher than in ITER. In DEMO energy density deposition to the first wall (FW) panels, divertor plates etc. Will be much higher than that foreseen in ITER [1]. A strong erosion of the plasma facing components (PFC) is expected, during the type I ELMs. To avoid an excessive heating and consequent thermal erosion during the heat loads in DEMO operation the plasma facing panels of the first wall (FW) blanket modules are profiled. The effect of leading edge unavoidable occurs due to finite misalignment of panels during maintenance and construction and brings to overheating of the panels corners. The mitigation of the inter-cassette misalignment consequences by chamfering the plate is considered
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