Thermal response of actively cooled tungsten monoblocks to inhomogeneous surface heat loading

Tungsten (W) monoblocks of the Plasma Facing Unit (PFU) are exposed to the inhomogeneous heat loads arises due to exponentially decaying power flux along Scrap of Layer (SOL) away from the separatrix as well as fabrication tolerances and misalignment of divertor targets in poloidal and toroidal directions. Thermal and structural analysis of a tungsten monoblock under such inhomogeneous heat loads are need to be investigated. The paper presents the results of Finite Element Analysis (FEA) performed on a tungsten monoblock loaded by inhomogeneous surface heat flux 10 MW/m(2) on the plasma wetted area of tungsten monoblock and 4 MW/m(2) on the shaded area with magnetically shadowed fraction of the monoblock length (Lshad) variation from 20% to 95% by a step of 15%. The other case is the total incident heat flux 20 MW/m(2) on the plasma wetted area of tungsten monoblock and no heat flux on the shaded area of a tungsten monoblock with Lshad variation from 20% to 95% by a step of 15%. FEA concluded that when Lshad is increased from 20% to 95% the total power to the monoblock decreases and the peak surface temperature decreases.