English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
Add to Basket
  Local TagsRelease HistoryDetailsSummary

Released
Journal Article

Characterisation and formation of a-C:D layers below the divertor of ASDEX Upgrade

MPS-Authors
/persons/resource/persons110279

Rohde,  V.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109910

Mayer,  M.
Material Research (MF), Max Planck Institute for Plasma Physics, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Rohde, V., Mayer, M., & ASDEX Upgrade Team (2003). Characterisation and formation of a-C:D layers below the divertor of ASDEX Upgrade. Physica Scripta, T103, 25-28.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-3F59-F
Abstract
Underneath the ASDEX Upgrade divertor two different types of amorphous hydrocarbon layers were found. Transparent soft layers with a typical ratio of D/C approximate to 1 and brownish hard layers with a ratio D/C approximate to 0.5. The amount of carbon deposited at the inner divertor is a factor approximate to 3 larger than at the outer divertor. Typical 0.3% of the total deuterium input during one experimental campaign are found in these layers in the divertor and only about 8 (.) 10(5) of the D input in the pumping ducts. From the deposition pattern it is concluded, that the layers are mainly build up by species with high sticking probability (0.1 < beta < 0.9). Neutral collisions and a parasitic plasma below the divertor are involved in the layer formation. Discharge resolved measurements of the layer deposition reveal a proportionality of the layer growth on the neutral density below the divertor.