Nitrogen retention in ASDEX Upgrade

We investigated the transport of nitrogen through the plasma and the interaction of nitrogen with tungsten under divertor exposure conditions during nitrogen-seeding experiments in ASDEX Upgrade. Using the divertor manipulator system, tungsten samples were exposed to well-characterized L-mode plasma...

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Bibliographic Details
Published in:Journal of nuclear materials 2015-08, Vol.463, p.668-671
Main Authors: Meisl, G., Schmid, K., Oberkofler, M., Krieger, K., Lisgo, S.W., Aho-Mantila, L., Reimold, F.
Format: Article
Language:English
Subjects:
Computer simulation
Exposure
Manipulators
Nuclear engineering
Nucleation
Transport
Tungsten
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Summary:We investigated the transport of nitrogen through the plasma and the interaction of nitrogen with tungsten under divertor exposure conditions during nitrogen-seeding experiments in ASDEX Upgrade. Using the divertor manipulator system, tungsten samples were exposed to well-characterized L-mode plasmas with and without nitrogen seeding. We also simulated nitrogen transport and re-distribution in these discharges by self-consistent WallDYN–DIVIMP modeling. For these simulations we applied a W–N surface model based on laboratory experiments and plasma backgrounds from SOLPS. In contrast to the conclusion from Kallenbach and Dux (2010) [5] we find that the N retention in ASDEX Upgrade is in agreement with results from laboratory experiments.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2014.10.031