Abstract
The performance of ITER Main Chamber H-alpha (and Visible Light) Spectroscopy diagnostics is challenged by the problem of separating the Balmer-alpha light emitted in the scrape-off-layer (SOL) in the main chamber from the much more intense divertor stray light (DSL) − the light emitted in the divertor in the same spectral line and reflected by the all-metal first wall (FW). The differential measurement scheme with the use of the optical dumps (OD) can address this issue by separating the contribution of DSL to the total signal. However, this scheme is effective only if the OD does not distort the DSL normalized spectrum (the line shape). The modeling of reflection properties of the ODs of various designs was performed using the ray-tracing simulation with “Zemax OpticStudio” software package. The resulting accuracy of recovering the SOL emission contribution to the total measured signal was estimated as a function of the DSL fraction in the total signal for the considered OD designs.
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