Nitrogen-assisted removal of deuterated carbon layers
2009 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 390-91, 647-650 p.Article in journal (Refereed) Published
Deuterated carbon films prepared in laboratory and boronised films prepared in the TEXTOR tokamak were exposed to hydrogen-nitrogen plasmas in order to determine erosion characteristics and fuel removal efficiency. Exposures were performed in: (i) TEXTOR tokamak during ion cyclotron heated wall conditioning discharges (ICWC) and (ii) TOMAS magnetic plasma facility in radio frequency-assisted glow discharges. The essential results are: (i) films exposed in TEXTOR are not affected: deuterium and carbon content does not decrease and the morphology is unchanged, and (ii) deuterium and carbon contents in films exposed in TOMAS is reduced by 30-60% after 2 h of cleaning and topographical changes are noted. The study shows that while exposure to H-2-N-2 laboratory plasma removes a-C:D films, no effect is seen at the position of the sample exposure during tokamak ICWC plasmas. It also indicates that the removal efficiency is only weakly related to nitrogen, since the highest removal efficiency is seen with pure hydrogen plasma. A comparison to oxygen-assisted fuel removal is given.
Place, publisher, year, edition, pages
2009. Vol. 390-91, 647-650 p.
PLASMA-FACING COMPONENTS, LABORATORY PLASMAS, TRITIUM RETENTION, ENERGY-DEPENDENCE
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-25581DOI: 10.1016/j.jnucmat.2009.01.180ISI: 000267747300151ScopusID: 2-s2.0-67349185586OAI: oai:DiVA.org:kth-25581DiVA: diva2:370696
18th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices Toledo, SPAIN, MAY 26-30, 2008
QC 201011172010-11-172010-10-272011-03-17Bibliographically approved