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. Lisgo, H. J. Van Der Meiden, V. Philipps, M. J. Van De Pol, A. E. Shumack, G. De Temmerman, W. A.J. Vijvers, G. M. Wright, N. J. Lopes Cardozo, J. Rapp, G. J. Van Rooij

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations


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
StatePublished - 2009
Externally publishedYes
Event12th International Workshop on Plasma-Facing Materials and Components for Fusion Applications, PFMC-12 - Julich, Germany
Duration: 11 May 200914 May 2009


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