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Wall conditioning of JET with the ITER-Like Wall.
- Source :
-
Journal of Nuclear Materials . Jul2013 Supplement, Vol. 438, pS1172-S1176. 0p. - Publication Year :
- 2013
-
Abstract
- Abstract: The initial conditioning cycle of JET ILW 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 mbarl/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 ILW 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. [Copyright &y& Elsevier]
- Subjects :
- *OXYGEN
*PLASMA gases
*BERYLLIUM oxide
*COMPARATIVE studies
*GLOW discharges
Subjects
Details
- Language :
- English
- ISSN :
- 00223115
- Volume :
- 438
- Database :
- Academic Search Index
- Journal :
- Journal of Nuclear Materials
- Publication Type :
- Academic Journal
- Accession number :
- 89303766
- Full Text :
- https://doi.org/10.1016/j.jnucmat.2013.01.259