Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 266-270 |
| Number of pages | 4 |
| Journal | Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms |
| Volume | 332 |
| Issue number | August |
| DOIs | |
| Publication status | Published - 2014 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- Deposited layers
- deuterium retention
- fusion
- microbeam
- microstructure
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Microstructure and inhomogeneous fuel trapping at divertor surfaces in the JET tokamak. / Bergsåker, H (Corresponding Author); Bykov, I; Petersson, P; Possnert, G; Likonen, Jari; Koivuranta, Seppo; Coad, J P; Widdowson, A M.
In: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, Vol. 332, No. August, 2014, p. 266-270.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Microstructure and inhomogeneous fuel trapping at divertor surfaces in the JET tokamak
AU - Bergsåker, H
AU - Bykov, I
AU - Petersson, P
AU - Possnert, G
AU - Likonen, Jari
AU - Koivuranta, Seppo
AU - Coad, J P
AU - Widdowson, A M
PY - 2014
Y1 - 2014
N2 - The plasma deposited layers at divertor surfaces in the JET tokamak with carbon wall have been studied post mortem, using micro ion beam analysis (µ-IBA) methods, optical microscopy and scanning electron microscopy (SEM). The layers were formed during plasma operations over different periods through 1998-2009. They frequently have a columnar structure. For µ-IBA a 3 MeV 3He beam was used, focused to about 5-15 µm size. Nuclear reaction analysis was used to measure D, Be and C. Elemental mapping was carried out both at the original surface and on polished layer cross sections. Trapped deuterium is predominantly found in remote areas on the horizontal bottom divertor tiles and in regions with locally enhanced deuterium concentration on the vertical tiles. Pockets with enhanced deuterium concentration are found in the carbon fibre composite (CFC) substrate. Areas with dimensions of about 100 µm with enhanced deuterium concentration are also found inside the deposited layers. The inhomogeneous fuel trapping is tentatively explained with co-deposition in partly protected pits in the substrate and by incorporation of dust particles in the growing layers
AB - The plasma deposited layers at divertor surfaces in the JET tokamak with carbon wall have been studied post mortem, using micro ion beam analysis (µ-IBA) methods, optical microscopy and scanning electron microscopy (SEM). The layers were formed during plasma operations over different periods through 1998-2009. They frequently have a columnar structure. For µ-IBA a 3 MeV 3He beam was used, focused to about 5-15 µm size. Nuclear reaction analysis was used to measure D, Be and C. Elemental mapping was carried out both at the original surface and on polished layer cross sections. Trapped deuterium is predominantly found in remote areas on the horizontal bottom divertor tiles and in regions with locally enhanced deuterium concentration on the vertical tiles. Pockets with enhanced deuterium concentration are found in the carbon fibre composite (CFC) substrate. Areas with dimensions of about 100 µm with enhanced deuterium concentration are also found inside the deposited layers. The inhomogeneous fuel trapping is tentatively explained with co-deposition in partly protected pits in the substrate and by incorporation of dust particles in the growing layers
KW - Deposited layers
KW - deuterium retention
KW - fusion
KW - microbeam
KW - microstructure
U2 - 10.1016/j.nimb.2014.02.075
DO - 10.1016/j.nimb.2014.02.075
M3 - Article
VL - 332
SP - 266
EP - 270
JO - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
SN - 0168-583X
IS - August
ER -