Abstract
The window target unit for an LBE-cooled primary core is one of the basic options considered in the framework of the preliminary design study of an experimental accelerator-driven system (PDS-XADS). In the present work, a numerical design study using the computational fluid dynamics (CFD) code CFX 5.6 was performed for the active part of this option with special attention to the coolability of the window. Steady-state as well as beam trip behaviours under normal operating conditions were investigated with the advanced turbulence model combined with the advanced wall treatment available in the new CFX 5 version. Based on the results of CFX 5.6 calculations, the window thickness was reduced to 2 mm in the centre from the initial proposal of 3 mm in order to satisfy the thermal design limit. The maximum temperature change rate of the window under beam trips is predicted to be as high as 412 C/s at 0.1 s after the beam interrupt. It is clear that beam trips with a beam interrupt duration less than 1 s could also be crucial to the integrity of the window.
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