Simulations with current constraints of ELM- induced tungsten melt motion in ASDEX Upgrade.

0478613 - ÚFP 2018 RIV GB eng J - Článek v odborném periodiku
Thorén, E. - Bazylev, B. - Ratynskaia, S. - Tolias, P. - Krieger, K. - Pitts, R.A. - Pestchanyi, S. - Komm, Michael - Sieglin, B.
Simulations with current constraints of ELM- induced tungsten melt motion in ASDEX Upgrade.
Physica Scripta. T170, December (2017), č. článku 014006. ISSN 0031-8949. E-ISSN 1402-4896.
[PFMC 2017: 16th International Conference on Plasma-Facing Materials and Components for Fusion Applications. Düsseldorf, 16.05.2017-19.05.2017]
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: thermionic * MEMOS * AUG * tungsten * melting
Obor OECD: 1.3 Physical sciences
Impakt faktor: 1.902, rok: 2017
http://iopscience.iop.org/article/10.1088/1402-4896/aa8855/meta

Melt motion simulations of recent ASDEX Upgrade experiments on transient-induced melting of a tungsten leading edge during ELMing H-mode are performed with the incompressible fluid dynamics code MEMOS 3D. The total current flowing through the sample was measured in these experiments providing an important constraint for the simulations since thermionic emission is considered to be responsible for the replacement current driving melt motion. To allow for a reliable comparison, the description of the space-charge limited regime of thermionic emission has been updated in the code. The effect of non-periodic aspects of the spatio-temporal heat flux in the temperature distribution and melt characteristics as well as the importance of current limitation are investigated. The results are compared with measurements of the total current and melt profile.
Trvalý link: http://hdl.handle.net/11104/0274678