MEMOS code validation on JET transient tungsten melting experiments

0433550 - ÚFP 2015 JP eng A - Abstract
Bazylev, B. - Arnoux, G. - Coenen, J.W. - Matthews, G. F. - Mertens, Ph. - Knaup, M. - Jachmich, S. - Clever, M. - Dejarnac, Renaud - Coffey, I. - Corre, Y. - Devaux, S. - Gauthier, E. - Horáček, Jan - Krieger, K. - Marsen, S. - Meigs, A. - Pitts, R.A. - Puetterich, T. - Rack, M. - Stamp, M. - Sergienko, G. - Tamain, P. - Thompson, V. … Total 25 authors
MEMOS code validation on JET transient tungsten melting experiments.
21st International Conference on Plasma Surface Interactions 2014. Toki City: National Institute for Fusion Science, 2014. P2-098-P2-098.
[International Conference on Plasma Surface Interactions 2014/21./. 26.05.2014-30.05.2014, Kanazawa]
Institutional support: RVO:61389021
Keywords : Heat loads * misalignment * JET * tungsten * melting * MEMOS * code
Subject RIV: BL - Plasma and Gas Discharge Physics
http://psi2014.nifs.ac.jp/Files/Files/Abstracts/P2-098_Bazylev_PSI2014.pdf

A new experiment has now been performed on JET, in which a deliberately misaligned lamella in the divertor has been used to perform controlled ELM transient melting. This paper reports on the application of the 3D MEMOS code to modelling of these experiments. Input heat loads are obtained from experimental data. During ELMing H-mode, the calculated time dependent, 3D temperature distributions in the special lamella lead to extremely high temperature gradients at the leading edge and noticeable W evaporation. Simulations demonstrate that consistency with the measured IR temperatures is only possible if the impinging heat flux is about a factor 3 lower than expected from geometrical considerations. Importantly, the code indicates that that shielding by the evaporated tungsten prevents bulk melting between ELMs. Encouragingly, the simulations are also able to quantitatively reproduce the dimensions of the damaged area. The principle mechanism responsible for the melting is
Permanent Link: http://hdl.handle.net/11104/0237750