Infoscience

Conference paper

Nitrogen and neon retention in plasma-facing materials

Rubel, M.; Philipps, V.; Marot, L.; Petersson, P.; Pospieszczyk, A.; Schweer, B.
  • Presented at: 19th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices (PSI), San Diego, CA, May 24-28, 2010
  • Published in: Journal Of Nuclear Materials, vol. 415, p. S223-S226
  • Publication date: 2011

Tungsten plate was exposed in the TEXTOR tokamak during nitrogen-assisted discharges. In order to determine material mixing on tungsten, the plate was examined ex situ with ion beam analysis techniques including time-of-flight heavy ion elastic recoil detection analysis and also with X-ray photoelectron spectroscopy. Nitrogen content in the range from 1.3 x 10(15) to 3.4 x 10(15) cm(-2) is measured in the outermost surface layer (20 nm) of the W plate. Photoelectron spectroscopy detects nitrogen both in the elemental and compound form, i.e. tungsten nitride (WN/W2N). Nitrogen is measured even in hot areas free from deuterium. Also neon co-implantation into the plasma-facing components has been identified following Ne-cooled pulses. (C) 2010 EURATOM. Published by Elsevier B.V. All rights reserved.

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