Spectroscopic Measurements of Be Erosion at JET ILW and Interpretation with ERO Modelling

Beryllium (Be) erosion has been studied in dedicated limiter discharges in JET with the recently installed ITER-like wall. Passive spectroscopy in the vicinity of the solid Be limiter is used for measurement of the Be physical sputtering as the main erosion mechanism. To consider the 3D configuration of plasma parameters and electromagnetic field, actual limiter shape and local transport affecting the fraction of Be coming into the observation volume, detailed modelling with the ERO code has been applied to interpret the experimental data. The observed dependence of line intensities and line ratios on plasma parameters during the density scan and various line ratios are used to validate the model and the underlying data including the recently introduced assumptions for Be physical sputtering, the very same which were used before for ITER predictive modelling.
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EFDC120223 3.36 Mb