Abstract
The chemical erosion of carbon was investigated in the linear plasma device Pilot-PSI for ITER divertor relevant hydrogen plasma flux densities 10 23 < Γ < 1025 m-2 s-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 0.7 eV, 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 × 1024 m-2 s-1 was 0.9% for Te < 0.5 eV as determined by surface profilometry.
| Original language | English |
|---|---|
| Pages (from-to) | S137-S140 |
| Journal | Journal of Nuclear Materials |
| Volume | 415 |
| Issue number | 1 SUPPL |
| DOIs | |
| State | Published - Aug 1 2011 |
| Externally published | Yes |
Funding
This work was supported by the European Communities under the contract of Association between EURATOM/FOM and carried out within the framework of the European Fusion Programme with financial support from NWO and the NWO Grant No. RFBR 047.018.002. The views and opinions expressed herein do not necessarily reflect those of the European Commission.