Overview of nitrogen-15 application as a tracer gas for material migration and retention studies in tokamaks

Experimental and analytical procedures related to the application of nitrogen-15 isotope for material migration studies have been developed and used for tracer experiments in the TEXTOR and ASDEX-Upgrade tokamaks in order to assess the retention of nitrogen in plasma-facing components made of graphi...

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Bibliographic Details
Published in:Physica scripta 2014-04, Vol.T159 (1), p.14042
Main Authors: Petersson, P, Rubel, M, Possnert, G, Brezinsek, S, Kreter, A, Möller, S, Hakola, A, Mayer, M, Miettunen, J, Airila, M I, Makkonen, T, Neu, R, Rohde, V
Format: Article
Language:English
Subjects:
ASDEX-Upgrade
erosion and deposition
fuel retention
TEXTOR
tracer techniques
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Summary:Experimental and analytical procedures related to the application of nitrogen-15 isotope for material migration studies have been developed and used for tracer experiments in the TEXTOR and ASDEX-Upgrade tokamaks in order to assess the retention of nitrogen in plasma-facing components made of graphite and tungsten. The surface study was performed by time-of-flight heavy ion elastic recoil detection analysis and by means of nuclear reaction analysis based on the 15N(p,γα)12C process. In both tokamaks nitrogen retention has exceeded 10% of the injected gas. In ASDEX-Upgrade the largest fraction of 15N has been detected on protruding parts near the injection port, while around 4% has been found in the divertor. The ASDEX-Upgrade results have also been modeled. Helium trapping has been measured in deposits containing tungsten and nitrogen.
ISSN:0031-8949
1402-4896
1402-4896
DOI:10.1088/0031-8949/2014/T159/014042