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

Westerhout, J and Borodin, D and Al, R S and Brezinsek, S and Hoen, M H J 't and Kirschner, A and Lisgo, S and van der Meiden, H J and VPhilipps, and van de Pol, M J and Shumack, A E and Temmerman, G De and Vijvers, W A J and Wright, G M and Cardozo, N J Lopes and Rapp, J and van Rooij, G J (2009) Chemical erosion of different carbon composites under ITER-relevant plasma conditions. Physica Scripta, 2009 (T138). 014017.

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We have studied the chemical erosion of different carbon composites in Pilot-PSI at ITER-relevant hydrogen plasma fluxes (~10 24 m -2 s -1 ) and low electron temperatures ( T e ~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 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.

Item Type:Article
ID Code:11295
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:31
Last Modified:02 Nov 2011 00:47

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