Overview of nitrogen-15 application as a tracer gas for material migration and retention studies in tokamaks
2014 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T159, 014042- p.Article in journal (Refereed) Published
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 N-15(p, gamma alpha)C-12 process. In both tokamaks nitrogen retention has exceeded 10% of the injected gas. In ASDEX-Upgrade the largest fraction of N-15 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.
Place, publisher, year, edition, pages
2014. Vol. T159, 014042- p.
erosion and deposition, tracer techniques, fuel retention, TEXTOR, ASDEX-Upgrade
IdentifiersURN: urn:nbn:se:uu:diva-225542DOI: 10.1088/0031-8949/2014/T159/014042ISI: 000334847800043OAI: oai:DiVA.org:uu-225542DiVA: diva2:726560