Use of a High Resolution Overview Spectrometer for the Visible Range in the Boundary Plasma of TEXTOR

Present-day fusion devices use graphite as plasma-facing material at the locations of highest flux. Owing to erosion and deposition, a complex hydrocarbon chemistry takes place at the surface, including the formation of a-C:H layers. The ratio of hydrocarbon to deuterium flux defines the chemical erosion yield – a measure for the chemistry. Passiv