Erosion and screening of tungsten during inter/intra-ELM periods in the JET-ILW divertor

0541103 - ÚFP 2021 RIV NL eng J - Článek v odborném periodiku
Huber, A. - Brezinsek, S. - Huber, V. - Sertoli, M. - Sergienko, G. - Borodkina, Irina - Baruzzo, M. - Kirschner, A. - Borodin, D. - Mailloux, J. - Aleiferis, S. - Carvalho, P. - Lawson, K. - Linsmeier, Ch. - Meigs, A. - Menmuir, S. - Mertens, P. - Pawelec, E. - Shaw, A.
Erosion and screening of tungsten during inter/intra-ELM periods in the JET-ILW divertor.
Nuclear Materials and Energy. Roč. 25, December (2020), č. článku 100859. E-ISSN 2352-1791
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: Divertor screening of tungsten * jet-ilw * pfc * psi * Tungsten erosion * Tungsten imaging spectroscopy * W Divertor
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 2.320, rok: 2020
Způsob publikování: Open access
https://www.sciencedirect.com/science/article/pii/S2352179120301265?via%3Dihub

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.
Trvalý link: http://hdl.handle.net/11104/0318688