Author/Authors :
Widdowson، نويسنده , , A. and Baldwin، نويسنده , , M.J and Coad، نويسنده , , J.P. and Doerner، نويسنده , , R.P. and Hanna، نويسنده , , J. and Hole، نويسنده , , D.E. and Matthews، نويسنده , , G.F. and Rubel، نويسنده , , M. and Seraydarian، نويسنده , , R. and Xu، نويسنده , , H.، نويسنده ,
Abstract :
Beryllium has been chosen as the first wall material for ITER. In order to understand the issues of material migration and tritium retention associated with the use of beryllium, a largely beryllium first wall will be installed in JET. As part of the JET ITER-like wall, beryllium tiles with marker coatings are proposed as a diagnostic tool for studying the erosion and deposition of beryllium around the vessel. The nominal structure for these coatings is a ∼10 μm beryllium surface layer separated from the beryllium tile by a 2–3 μm metallic inter-layer. Two types of coatings are tested here; one with a nickel inter-layer and one with a copper/beryllium mixed inter-layer. The coating samples were deposited by DC magnetron sputtering at General Atomics and were exposed to deuterium plasma in PISCES-B. The results of this testing show that the beryllium/nickel marker coating would be suitable for installation in JET.
