The preliminary design of cooling channel for ITER GDC

Just as Diagnostic First Wall (DFW), electrode head will bear strict heat loads. Cooling channel of electrode head is particularly important. In this paper, multilayer cooling channels of electrode head are introduced, and “U” shape route in first layer is adopted to improve the heat exchange. The calculation of the thermal hydraulic and total strain range for optimization results was conducted with ANSYS software, and compared with the data before optimization. The results show that the average surface temperature of electrode head and the total strain range have been greatly reduced. The analysis results shows that the maximum surface temperature of the electrode head decreases from 379.6°C to 293.2°C, reduced by 22%. The total strain range decreased from 1.4% to 0.39%, reduced by 72%. However, the strain ranges in two localized regions is from 0.3% to 0.39% where only 9800 cycles can be achieved when strain range is 0.39%. The electrode head design faces challenge of thermal fatigue. Further work should be focused on both the structural optimization and also cooling water parameters improvement.