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Nitrogen-assisted removal of deuterated carbon layers
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0001-9901-6296
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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
Abstract [en]

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.
Keyword [en]
PLASMA-FACING COMPONENTS, LABORATORY PLASMAS, TRITIUM RETENTION, ENERGY-DEPENDENCE
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-25581DOI: 10.1016/j.jnucmat.2009.01.180ISI: 000267747300151Scopus ID: 2-s2.0-67349185586OAI: oai:DiVA.org:kth-25581DiVA: diva2:370696
Conference
18th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices Toledo, SPAIN, MAY 26-30, 2008
Note
QC 20101117Available from: 2010-11-17 Created: 2010-10-27 Last updated: 2017-12-12Bibliographically approved

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