| Autor: |
A. Huber, S. Brezinsek, V. Huber, M. Sertoli, G. Sergienko, I. Borodkina, M. Baruzzo, A. Kirschner, D. Borodin, J. Mailloux, S. Aleiferis, P. Carvalho, K. Lawson, Ch. Linsmeier, A. Meigs, S. Menmuir, Ph. Mertens, E. Pawelec, A. Shaw |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Nuclear Materials and Energy, Vol 25, Iss , Pp 100859- (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2352-1791 |
| DOI: |
10.1016/j.nme.2020.100859 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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