Meeting Report and Presentations

Consultancy Meeting on Plasma Material Interaction with Steel Surfaces held on 20 August 2014 at IAEA, Vienna, Austria.

Summary

A Consultancy Meeting was held on 20 August 2014 at IAEA Headquarters in Vienna to review data needs for plasma-wall interaction with reduced-activation steel surfaces in fusion devices and delimit the scope of a possible coordinated research project (CRP) on that topic. Participants in the meeting were Drs Kai Nordlund (University of Helsinki, Finland), Bernhard Unterberg (Forschungszentrum Jülich, Germany), Martin Köppen (Forschungszentrum Jülich, Germany), Wolfgang Jacob (Max-Planck Institut für Plasmaphysik, Garching bei München, Germany), Stephan Irle (Nagoya University, Japan), Anna Golubeva (Kurchatov Institute, Moscow, Russian Federation), Russell Doerner (University of California at San Diego, USA) and IAEA staff. (The meeting immediately followed a meeting on plasma interaction with beryllium and shared some participants.)

The meeting affirmed the need for a CRP devoted to plasma interaction with steel surfaces for fusion. Erosion and tritium retention are both important and erosion is a much more complicated problem for steel than for elementary metals due to the expected differential sputtering of elements, preferentially eroding the light constituents. A CRP is for coordinated research and this must be emphasized strongly. The CRP has to arrange that different groups carry out experiments using the same target materials, including pre-damaged targets. The damage will generally be produced by surrogate irradiation, not neutrons. It appears that most of the ongoing work on plasma-material interaction with steel is experimental work. For theoretical work the development of potentials is done anyway for study of steel as a structural material, but dedicated modelling of plasma-material interaction with steel needs to be encouraged.

Meeting Report

Report INDC(NDS)-0671, Plasma-material Interaction with Steel Surfaces, Report IAEA(NDS)-0671, September 2014.

Agenda and Presentations

09:00 - 09:15 B. J. Braams: Welcome, introduction to planned CRP.
09:15 - 10:15 W. Jacob: Plasma surface interaction issues for steel as plasma-facing material. Survey and general discussion.
10:15 - 10:30 Break
10:30 - 11:15 A. Golubeva: Retention and permeation of hydrogen isotopes through RAFM RUSFER-EK-181.
11:15 - 12:00 R. Doerner: Plasma surface interaction issues for steel as plasma-facing material. Presentation and discussion from the PISCES perspective.
12:00 - 13:15 Lunch
13:15 - 14:00 M. Koeppen and B. Unterberg: Plasma surface interaction issues for steel as plasma-facing material. Presentation and discussion from the Jülich perspective.
14:00 - 14:45 S. Irle: Survey of quantum chemical calculations on plasma-steel interactions.
14:45 - 15:00 Break
15:00 - 15:45 K. Nordlund: Review of development of interatomic potentials and MD calculations for Fe-H and beyond.
15:45 - 16:30 All: General discussion.
16:30 Close of meeting.

Participants: (From left to right)
W. Jacob, H.-K. Chung, K.-M. Lim, S. Irle, B. Braams, R. Doerner, K. Nordlund, M. Köppen, A. Golubeva, B. Unterberg