Thermal analysis of an exposed tungsten edge in the JET divertor

0445029 - ÚFP 2016 RIV NL eng J - Článek v odborném periodiku
Arnoux, G. - Coenen, J. - Bazylev, B. - Corre, Y. - Matthews, G. F. - Balboa, I. - Clever, M. - Dejarnac, Renaud - Devaux, S. - Eich, E. - Gauthier, E. - Frassinetti, L. - Horáček, Jan - Jachmich, S. - Kinna, D. - Marsen, S. - Mertens, Ph. - Pitts, R.A. - Rack, M. - Sergienko, G. - Sieglin, B. - Stamp, M. - Thompson, V.
Thermal analysis of an exposed tungsten edge in the JET divertor.
Journal of Nuclear Materials. Roč. 463, August (2015), s. 415-419. ISSN 0022-3115. E-ISSN 1873-4820.
[PLASMA-SURFACE INTERACTIONS 21: International Conference on Plasma-Surface Interactions in Controlled Fusion Devices. Kanazawa, 26.05.2014-30.05.2014]
Institucionální podpora: RVO:61389021
Klíčová slova: Heat loads * IR thermography * misalignment * JET * tungsten
Obor OECD: Nuclear related engineering
Impakt faktor: 2.199, rok: 2015
http://www.sciencedirect.com/science/article/pii/S0022311514007867#

In the recent melt experiments with the JET tungsten divertor, we observe that the heat flux impacting on a leading edge is 3 to 10 times lower than a geometrical projection would predict. The surface temperature, tungsten vaporisation rate and melt motion measured during these experiments is consistent with the simulations using the MEMOS code, only if one applies the heat flux reduction. This unexpected observation is the result of our efforts to demonstrate that the tungsten lamella was melted by ELM induced transient heat loads only. This paper describes in details the measurements and data analysis method that led us to this strong conclusion. The reason for the reduced heat flux are yet to be clearly established and we provide some ideas to explore. Explaining the physics of this heat flux reduction would allow to understand whether it can be extrapolated to ITER.
Trvalý link: http://hdl.handle.net/11104/0247446