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A colorimetric technique has been introduced at TEXTOR to observe the development of high carbon erosion at wall elements. Colorimetry quantifies the interference colours of the transparent co-deposits of carbon and hydrogen which are mainly dependant upon thickness. The paper describes the set-up and calibration of the facility as a video and an image processing system and how colour coordinates are defined and measured. Rates of erosion are measured on precarbonised graphite test pieces exposed in the SOL for ohmic and neutral beam heated plasmas. Erosion at the tangency point of the probe is found and indication for prompt deposition as well as the influence of limiter geometry.

Additional information

Authors: WIENHOLD P, Forschungszentrum Jülich GmbH (KFA) (DE);WESCHENFELDER F, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Contributions to High-Temperature Plasma Physics (1994) pp. 415-430
Record Number: 199411636 / Last updated on: 1995-01-10
Original language: en
Available languages: en