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

J. Westerhout, D. Borodin, R.S. Al, S. Brezinsek, M.H.J. 't Hoen, A. Kirschner, S.W. Lisgo, H J. van der Meiden, V. Philipps, Marc J. van de Pol, A.E. Shumack, G.C. De Temmerman, W.A.J. Vijvers, G.M. Wright, N.J. Lopes Cardozo, J. Rapp, G.J. Van Rooij

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Abstract

We have studied the chemical erosion of different carbon composites in Pilot-PSI at ITER-relevant hydrogen plasma fluxes (∼1024 m -2 s-1) and low electron temperatures (Te∼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® 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 Te>1 eV and ion fluxes ranging between 1023 and 1024 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.

Original languageEnglish
Article number14017
JournalPhysica Scripta, Topical Volumes
VolumeT138
DOIs
Publication statusPublished - 2009

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