Power and Particle Fluxes to Plasma-Facing Components in ELM-Mitigated H-Mode Discharges on JET

The effect of ELM-mitigation techniques such as the use of magnetic field perturbations, gas fuelling and impurity seeding using nitrogen has been studied. With increasing ELMfrequency the heat flux factor reduces only weakly. The heat flux factor, which has been analysed taking into account ELM-profile broadening and strike point movement and which is proportional to the surface temperature rise due to the heat pulse during the ELM, decreases with confinement and pedestal pressure at the same rate for mitigated ELMs using gasfuelling and magnetic perturbation fields. Only at very high fuelling rates of nitrogen, a drastic drop of the heat flux factor with modest confinement reduction has been found.
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