Using Dispersed Gas Fluid Flow for Cooling of Energy Stressed Elements of Tokamak Structure.

Selection of the cooling method for energy stressed elements, such as the divertor, limiter, and blanket, upon impact of powerful heat flows is an important issue for all research fusion reactors. At present, these elements are cooled by water under pressure, which can involve serious problems in an emergency situation related to poor tightness of elements of cooling system. This work considers an alternative cooling method of such structural elements using a two-component dispersed flow of coolant. Heating of the working segment under conditions close to stationary loads of the ITER first wall has been simulated at the test bench of the Department of General Physics and Nuclear Fusion of the National Research University Moscow Power Engineering Institute. Cooling of the working section is performed by dispersed flow of coolant over the inner surface. The temperature distribution over the wall thickness of working section has been obtained. The thermal conductivity of the material of the working section has been assessed. It is demonstrated that the proposed cooling method makes it possible to perform efficient heat removal under thermal loads in the range of 0.7–3.2 MW/m2. [ABSTRACT FROM AUTHOR]