Divertor Stray Light Analysis in JET-ILW and Implications for the H-£ Diagnostic in ITER

We report on the first results for the spectrum of divertor stray light (DSL) and the signal to background ratio for D-alpha light emitted from the far SOL and divertor in JET in the recent ITERlike wall (ILW) campaign. The results support the expectation of a strong impact of DSL upon the H-alpha (and Visible Light) Spectroscopy Diagnostic in ITER.
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