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Colorimetry is introduced at TEXTOR as a technique to observe the carbon erosion on extended areas. The paper describes the facility as a video and an image processing system, and the thickness determination by means of the colour coordinate hue (h(xy)). Erosion rates up to -22 nm/s are measured on a precarbonised spherical graphite test piece exposed in the SOL for neutral beam heated plasmas. Part of the plasma is redeposited promptly with +4 nm/s, but the transition range between net erosion and deposition is not stationary. Erosion is observed around the tangency point. Beyond 2 cm into the SOL, deposition is found to be influenced by the limiter geometry.

Additional information

Authors: WIENHOLD P, Forschungszentrum Jülich GmbH (KFA) (DE);WESCHENFELDER F, Forschungszentrum Jülich GmbH (KFA) (DE);WINTER J, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 220-222 (1995) pp. 452-456
Record Number: 199510756 / Last updated on: 1995-07-12
Original language: en
Available languages: en