Thermal analysis of an exposed tungsten edge in the JET divertor

0433625 - ÚFP 2015 JP eng A - Abstract
Arnoux, G. - Coenen, J. - Balboa, I. - Bazylev, B. - Clever, M. - Corre, Y. - Dejarnac, Renaud - Devaux, S. - Eich, T. - Gauthier, E. - Frassinetti, L. - Horáček, Jan - Jachmich, S. - Kinna, D. - Marsen, S. - Matthews, G. F. - Mertens, Ph. - Pitts, R.A. - Rack, M. - Sergienko, G. - Sieglin, B. - Thompson, V. … Total 23 authors
Thermal analysis of an exposed tungsten edge in the JET divertor.
21st International Conference on Plasma Surface Interactions 2014. Toki City: National Institute for Fusion Science, 2014. P3-065-P3-065.
[International Conference on Plasma Surface Interactions 2014/21./. 26.05.2014-30.05.2014, Kanazawa]
Institutional support: RVO:61389021
Keywords : Heat loads * IR thermography * misalignment * JET * tungsten
Subject RIV: BL - Plasma and Gas Discharge Physics
http://psi2014.nifs.ac.jp/Files/Files/Abstracts/P3-065_Arnoux_PSI2014.pdf

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.
Permanent Link: http://hdl.handle.net/11104/0237811