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The occurrence of transient impurity events (TIE) leading to intense radiation spikes in JET plasma discharges has been studied since the installation of the ITER-like wall (ILW). To generate the observed average increase in radiated power of 1.5MW, a spherical particle of solid W of radius >90μm would be required. The drop in plasma energy caused by W-TIEs is fully recovered in 90% of all cases,...