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The thickness of a-C:H layers deposited on the inner wall of the tokamak TEXTOR has been determined from the interference colours. The colour-thickness relation is established by calculations taking into account the optical constants and by direct measurements of the thickness from coated samples. Agreement is found for a-C:H on stainless steel and on Si if n = 2.4 is assumed. An extrapolation for Mo and W substrates is made. In TEXTOR, 55 nm as average thickness of the a-C;H layer is found with a toroidal variation of 50% after a typical carbonisation of the walls.

Additional information

Authors: WIENHOLD P, Kernforschungsanlage Julich GmbH (DE);LITTMARK U, Kernforschungsanlage Julich GmbH (DE)
Bibliographic Reference: Paper presented: Symposium on Amorphous Hydrogenated Carbon Films, Strasbourg (FR), June 2-5, 1987
Availability: Available from (1) as Paper EN 34374 ORA
Record Number: 198910177 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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