Chemical erosion of different carbon composites under ITER-relevant plasma conditions

TitleChemical erosion of different carbon composites under ITER-relevant plasma conditions
Publication TypeJournal Article
Year of Publication2009
AuthorsJ. Westerhout, D. Borodin, R.S. Al, S. Brezinsek, M Hoen, A. Kirschner, S. Lisgo, H.J van der Meiden, V. Philipps, M.J. van de Pol, A.E Shumack, G. De Temmerman, W.AJ Vijvers, G.M Wright, N.JL Cardozo, J. Rapp, G.J van Rooij
JournalPhysica Scripta
Date PublishedDec
Type of ArticleProceedings Paper
ISBN Number0031-8949
Accession NumberISI:000273199200018

We have studied the chemical erosion of different carbon composites in Pilot-PSI at ITER-relevant hydrogen plasma fluxes (similar to 10(24) m(-2) s(-1)) and low electron temperatures (T-e similar to 1 eV). Optical emission spectroscopy on the CH A-X band was used to characterize the chemical sputtering. Fine grain graphite (R 6650, SGL Carbon Group), ITER-reference carbon fiber composite material (SNECMA NB31 and NB41; Dunlop 3D), nano-and micro-crystalline diamond coatings on molybdenum and SiC (Silit (R) SKD Reaction-Bonded, Saint-Gobain Ceramics) were compared. The chemical sputtering was similar for the different composites under comparable plasma conditions, except for SiC, which produced a ten times lower rate. The CH emission was constant at electron temperatures T-e > 1 eV and ion fluxes ranging between 10(23) and 10(24) m(-2) s(-1), but decreased at lower temperatures. This decrease is possibly due to changes in the excitation of CH and not due to a change in the chemical erosion rate.

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Fusion Physics



Alternate TitlePhys. Scr.

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