Abstract
The present paper deals with the surface heat flux estimation with embedded thermocouples (TC) in a Plasma Facing Component (PFC) of the WEST Tokamak. A 2D nonlinear unsteady calculation combined with the Conjugate Gradient Method (CGM) and the adjoint state is achieved in order to estimate the time evolution of the heat flux amplitude and decay length λq. The method is applied on different synthetic measurements in order to evaluate the accuracy of the method. The synthetic measurements are generated with realistic values of λq and magnitudes as those expected for ITER.
Highlights
Understanding heat flux deposition processes on Plasma Facing Components (PFC) is essential for PFC designs in order to allow reliable high power steady state plasma operations
In this paper, 2D nonlinear unsteady calculations are used with the Conjugate Gradient Method and the adjoint state, for the heat flux estimation on the divertor graphite PFCs of the WEST tokamak
It should be noted that no a priori information on the time evolution of the heat flux is needed for the estimation
Summary
Understanding heat flux deposition processes on Plasma Facing Components (PFC) is essential for PFC designs in order to allow reliable high power steady state plasma operations. It is necessary to be able to measure these high heat fluxes in order to know their true amplitude and spatial distribution on the PFC surface To achieve these objectives several thermal diagnostics (IR camera, calorimetry, embedded fibers Bragg grating and thermocouples) are planned for WEST and especially in the lower divertor where the ITER-like components will be integrated. A total of 20 TCs is embedded in the inertial graphite PFCs (red point in the figure 1b) in order to study the heat load pattern on the divertor in the toroidal (ripple effect due to 18 superconducting toroidal field coils with periodic heat flux every 20°) and poloidal (heat flux decay length due to the Scrape Off Layer (SOL) physic) directions. The main parameter of the peaked distribution of the heat flux is the value of λq, the characteristic decay length of the heat flux density in the SOL which is expected to vary between 2.5 and 10mm
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