Tokamak operation with a tungsten wall

Research report (imported) 2008 - Max-Planck-Institut für Plasmaphysik

Kallenbach, Arne
Tokamak: Rand- und Divertorphysik (Dr. Arne Kallenbach)
MPI für Plasmaphysik, Garching
In order to qualify tungsten as surface material for a future fusion reactor, the plasma facing carbon tiles of ASDEX Upgrade were coated with tungsten. The first experimental campaign – without wall conditioning by deposition of boron – demonstrated a favourable behaviour of tungsten with regard to hydrogen retention. After boronization, the reduced impurity content caused low intrinsic radiation. Injection of nitrogen re-established a radiative level required to protect the divertor from thermal overload, resulting also in an (unexpected) improvement of the energy confinement.

For the full text, see the German version.

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