Wall conditioning of JET with the ITER-Like Wall

TitleWall conditioning of JET with the ITER-Like Wall
Publication TypeJournal Article
Year of Publication2013
AuthorsD. Douai, S. Brezinsek, H.G Esser, E. Joffrin, T. Keenan, S. Knipe, D. Kogut, P.J Lomas, S. Marsen, I. Nunes, V. Philipps, R.A. Pitts, M. Shimada, P. de Vries
JournalJournal of Nuclear Materials
Volume438, Supplement
PaginationS1172 - S1176

The initial conditioning cycle of \{JET\} İLW\} is analysed and compared with restart and operation in 2008 with a carbon dominated wall. Comparable water and oxygen decay times are observed during bake-out in both cases. Despite a 2 × 10−3 mbar l/s leak rate during plasma operation, no further wall conditioning has been necessary after plasma restart in ILW, which dramatically contrasts with 2008. Plasma O content is lower with the ILW. Higher O levels are measured after nights or week-ends, BeO layers being formed and re-eroded, but do not impact plasma operation and performance. First results on isotopic wall changeover by \{GDC\} on the İLW\} six months of the first \{D2\} campaign evidence a reservoir of about 3 × 1022 atoms, i.e. ten time lower than in carbon PFCs. A study in \{JET\} of the glow discharge current distribution for different ratios of the ionization mean free paths to the vessel dimensions seems to indicate sufficient toroidal and poloidal homogeneity in ITER.







Alternate TitleJ. Nucl. Mater.

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