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FZJ-2018-02580

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Bestimmung der Eintritts- und Freisetzungsratenkonstanten und der Diffusionskonstanten von Wasserstoff und Deuterium für Inconel 600 durch Permeationsmessungen und Recyclingbeobachtungen an TEXTOR

Rota, E. (Corresponding author)FZJ*

1986
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18264

Report No.: Juel-2041

Abstract: The aim of the work was the determination of material constants for Inconel 600, which characterize the recycling processes between gaseous hydrogen and metallic walls. The study of such processes is particularly important for the present-day tokamaks and for future fusion devices, because the hydrogen coming from the plasma during a discharge reaches the inner wall, and is reemitted from it several times. Inconel 600 is a typical representative of the Ni based alloys which are often used as wall materials in such fusion machines. The constants which describe the recycling process phenomenologically way are defined as the entrance rate constant 2$\sigma$k$_{s}$ and as the release rate constant 2$\sigma$k$_{r}$ within a permeation model. The behavior of hydrogen in bulk will be described by the diffusion rate constant D and the solubility K$_{s}$. A further aim of this work was therefore to confirm the validity of the permeation model for Inconel 600 as well. With these goals in mind, laboratory experiments were made. The main part of the experiments was the observation of the stationary and time-dependent hydrogen (H$_{2}$ and D$_{2}$ ) permeation flux through a membrane of Inconel 600. Further, such a membrane can be asymmetric with respect to surface properties. We tried therefore to define the asymmetry and to understand it with the help of the permeation model which was amplified for this case. For these purposes the experimental device made it possible to reverse the permeation direction easily. A further part of the experiments was the observation of hydrogen release at the upstream side of the membrane, when this side of the membrane is exposed to atomic hydrogen. This allows us to determine the "recycling constant" R$_{C}$=D/2$\sigma$k$_{r}$. The method is very suitable for a tokamak device and was applied for the first time in the tokamak TEXTOR. [...]

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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