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Chemical erosion of carbon at ITER relevant plasma fluxes: Results from the linear plasma generator Pilot-PSI

Authors
Journal
Journal of Nuclear Materials
0022-3115
Publisher
Elsevier
Publication Date
Volume
415
Issue
1
Identifiers
DOI: 10.1016/j.jnucmat.2010.12.321
Disciplines
  • Chemistry

Abstract

Abstract The chemical erosion of carbon was investigated in the linear plasma device Pilot-PSI for ITER divertor relevant hydrogen plasma flux densities 1023<Γ<1025m−2s−1. The erosion was analyzed in situ by optical emission spectroscopy and post mortem by surface profilometry. The experiments indicate a threshold for the absolute carbon erosion rate as a function of plasma temperature Te around 0.7eV, a peak of the surface temperature around 550°C, and no dependence on plasma flux density. The latter implies a flux dependence of the chemical erosion yield as Γ−1. The value of the chemical erosion yield at the surface temperature of maximum erosion and Γ=1×1024m−2s−1 was 0.9% for Te<0.5eV as determined by surface profilometry.

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