Author/Authors :
Litnovsky، نويسنده , , A. and Philipps، نويسنده , , V. and Wienhold، نويسنده , , P. and Krieger، نويسنده , , K. and Kirschner، نويسنده , , A. and Borodin، نويسنده , , D. and Sergienko، نويسنده , , G. and Schmitz، نويسنده , , O. and Kreter، نويسنده , , A. and Samm، نويسنده , , U. and Richter، نويسنده , , S. and Breuer، نويسنده , , U.، نويسنده ,
Abstract :
Castellation is foreseen for the first wall and divertor area in ITER. The concern of the fuel accumulation and impurity deposition in the gaps of castellated structures calls for dedicated studies. Recently, a tungsten castellated limiter with rectangular and roof-like shaped cells was exposed to the SOL plasmas in TEXTOR. After exposure, roughly two times less fuel was found in the gaps between the shaped cells whereas the difference in carbon deposition was less pronounced. Up to 70 at.% of tungsten was found intermixed in the deposited layers in the gaps. The metal fraction in the deposit decreases rapidly with a depth of the gap. Modeling of carbon deposition in poloidal gaps has provided a qualitative agreement with an experiment. The significant anisotropy of C and D distributions in the toroidal gaps was measured.
