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A test of nitrogen-assisted plasma discharges for fuel removal from plasma-facing components in tokamaks
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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2008 (English)In: PROCEEDINGS OF THE 17TH INTERNATIONAL VACUUM CONGRESS/13TH INTERNATIONAL CONFERENCE ON SURFACE SCIENCE/INTERNATIONAL CONFERENCE ON NANOSCIENCE AND TECHNOLOGY / [ed] Johansson LSO, Andersen JN, Gothelid M, Helmersson U, Montelius L, Rubel M, Setina J, Wernersson LE, Bristol: IOP PUBLISHING LTD , 2008, Vol. 100, 062027- p.Conference paper (Refereed)
Abstract [en]

Safety regulations limit the amount of tritium accumulated in wall components of a fusion reactor to 350g. Because of this, reduction of long-term fuel inventory is one of the most urgent tasks to be resolved to ensure the safe and economic operation of a reactor-class fusion device. Several methods have been suggested and tested. The aim of this paper is to evaluate the cleaning efficiency of plasma-facing components by ICRH-assisted plasma discharges with in nitrogen-hydrogen in the TEXTOR tokamak. Three types of probes were investigated: laboratory prepared a-C: D layers on silicon; boron layers on silicon obtained by pre-boronisation in TEXTOR and not coated Inconel substrates. The main results are following: (i) laboratory prepared a-C: D layers are not affected: deuterium and carbon contents did not decrease (ii) the morphology of layers pre-boronised in TEXTOR is not affected (iii) no significant effects were noticed on Inconel probes. A comparison of cleaning methods with nitrogen and oxygen is also presented.

Place, publisher, year, edition, pages
Bristol: IOP PUBLISHING LTD , 2008. Vol. 100, 062027- p.
, Journal of Physics Conference Series, ISSN 1742-6588 ; 100
Keyword [en]
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-25568DOI: 10.1088/1742-6596/100/6/062027ISI: 000275655200223ScopusID: 2-s2.0-77954339214OAI: diva2:370997
17th International Vacuum Congress/13th International Conference on Surface Science/Internatinal Conference on Nanoscience and Technology Stockholm, SWEDEN, JUL 02-06, 2007
QC 20101118Available from: 2010-11-18 Created: 2010-10-27 Last updated: 2011-03-04Bibliographically approved

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