Abstract
During the campaign 2002–2003 a carbon erosion and deposition experiment
was performed in the lower divertor of ASDEX Upgrade. A complete
divertor cross section with erosion sensitive markers, deposition
monitors below the divertor and time resolved measurements by quartz
mircobalance monitors (QMB) and Langmuir probes are used. The largest
amount of carbon deposition was found at the inner divertor target
plates. At the outer divertor, erosion was observed. However, the
behaviour at the outer strike point zone is not jet fully understood.
The deposition at remote areas is concentrated below the divertor.
Neutrals seem to be dominant at the layer formation at remote areas.
Additional erosion of deposited layers by ions reduces the layer
thickness dramatically at some locations. QMB data show that at the
outer divertor, deposition and erosion occur at the same location,
depending on the main plasma properties. A parasitic plasma is observed
below the divertor.
Original language | English |
---|---|
Pages (from-to) | 847 - 851 |
Number of pages | 5 |
Journal | Journal of Nuclear Materials |
Volume | 337-339 |
DOIs | |
Publication status | Published - 2005 |
MoE publication type | A1 Journal article-refereed |
Keywords
- ASDEX upgrade
- divertor
- erosion
- deposition
- divertor plasma
- carbon impurities
- ITER
- JET
- fusion energy