Effects of surface conditions on the plasma-driven permeation behavior through a ferritic steel alloy observed in VEHICLE-1 and QUEST

Effects of surface conditions on the plasma-driven permeation of hydrogen through a ferritic steel alloy F82H have been studied in a laboratory-scale plasma device: VEHICLE-1 and the medium-sized spherical tokamak: QUEST. Both of the surface contamination and area effects have been examined and disc...

Full description

Saved in:
Bibliographic Details
Published in:Journal of nuclear materials 2015-08, Vol.463, p.1066-1070
Main Authors: Zhou, H., Hirooka, Y., Zushi, H., Kuzmin, A., Ashikawa, N., Muroga, T., Sagara, A.
Format: Article
Language:English
Subjects:
Alloy steels
Diffusion
Diffusion layers
Ferritic stainless steels
Martensitic stainless steels
Mathematical models
Penetration
Permeation
Tokamak devices
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Effects of surface conditions on the plasma-driven permeation of hydrogen through a ferritic steel alloy F82H have been studied in a laboratory-scale plasma device: VEHICLE-1 and the medium-sized spherical tokamak: QUEST. Both of the surface contamination and area effects have been examined and discussed. Thick surface impurity film has been found to act as a second layer for diffusion and affect the permeation behavior in laboratory-scale and tokamak experiments. Hydrogen diffusion coefficient in the impurity layer has been estimated using the multi-layer diffusion model. A decrease in steady state permeation flux has been measured when increasing the plasma-facing surface area, which is in agreement with theoretical prediction.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2014.10.092