• Energy Research

Nuclear materials and energy 34, 101345 - (2023). doi:10.1016/j.nme.2022.101345 Published by Elsevier, Amsterdam [u.a.]

Nuclear materials and energy 37, 101521 - (2023). doi:10.1016/j.nme.2023.101521 Published by Elsevier, Amsterdam [u.a.]

Nuclear materials and energy 38, 101587 - (2024). doi:10.1016/j.nme.2024.101587 Published by Elsevier, Amsterdam [u.a.]

Intra-ELM tungsten sources, which dominate the total W source, are quantified in the inner and outer divertor of JET-ILW. The amount of the sputtered W atoms for individual ELMs demonstrates a clear dependence on the ELM frequency. It decreases when the pedestal temperature is lower and, correspondingly, the ELM frequency is higher. Nevertheless, the entire gross erosion W source (the number of eroded W atoms per second due to ELMs) increases initially with ELM frequency and reaches its maximum at fELM ≈ 50–55 Hz followed by its reduction in the high frequency range.The in/out asymmetry of the intra-ELM W sources during ELMs is a critical issue and is investigated in this contribution. At a lower ELM frequency of about 35 Hz the outer divertor gross W source is larger by a factor of 1.5. However the in/out asymmetry of the W erosion decreases strongly with ELM frequency demonstrating a nearly symmetric W source in both divertor legs at frequencies above 70 Hz. The screening of tungsten in the open magnetic configuration with strike points on tile 5 is more efficient by a factor of about 1.7 than in the corner configuration with the outer strike point at the pumping duct entrance.