Local Migration Studies of High-Z Metals in the TEXTOR Tokamak
(English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896Article in journal (Refereed) In press
Volatile compounds of tungsten (WF6) and molybdenum (MoF6) were used as tracers of high-Z metal migration in the TEXTOR tokamak in several gas injection experiments when puffing was done through a test limiter. The experiments with W were performed prior major shut-downs, while the MoF6 was followed by the final shutdown in connection with TEXTOR decommissioning. In all cases a set of various surface probes and limiter tiles were retrieved and analysed with electron and ion beam techniques. The focus was on the local deposition in the vicinity of the gas inlet and in the inlet system. Depth profiles in the deposits and metal distribution maps clearly shown that only near the gas inlet significant amounts of Mo are deposited along the scrape-off layer flow and E×B drift directions, which could be reproduced by ERO-code modelling. Correlation between the plasma operation scenario and the deposition patterns is presented.
Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP).
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-178044OAI: oai:DiVA.org:kth-178044DiVA: diva2:876241
QP 2015122015-12-032015-12-032015-12-03Bibliographically approved