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The present paper deals with the surface heat flux estimation withthermocouples (TC) and fiber Bragg grating (FBG) embedded in the plasma facingcomponents (PFC) of the WEST tokamak. A 2D heat transfer model combined withthe conjugate gradient method (CGM) and the adjoint state is used to estimatethe plasma heat flux deposited on the PFC. The plasma heat flux ischaracterized by the time evolution of its amplitude and spatial shape on thetarget (heat flux decay length $\lambda^t_q$, power spreading in the privateflux region $S^t$ and the strike point location $x_0$). As a first step, fiveohmic pulses have been investigated with different magnetic configuration anddivertor X-point height varying from 44 to 68 mm from the surface. Despite anoutboard shift, the relative displacements of the outer strike point as well asthe heat flux decay length derived from the TC/FBG systems are consistent withthe magnetic equilibrium reconstruction.

First heat flux estimation in the lower divertor of WEST with embedded thermal measurements