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Fuel re-absorption by thermally treated co-deposited carbon layers
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2011 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, no T145, 014006- p.Article in journal (Refereed) Published
Abstract [en]

Systematic studies have been conducted to address the fuel re-absorption by carbon deposits under repeated exposure to plasma after cleaning procedures. The investigation was done with graphite tiles from ALT-II (Advanced Limiter Test II), i.e. the main limiter at the TEXTOR tokamak. Pure graphite plates were used as the reference material. The experimental programme comprised the following: pre-characterization of specimens; D desorption by baking the tile at 1273 K; surface analyses of the fuel-depleted layers; exposure to deuterium in a laboratory plasma device and in TEXTOR; and quantitative assessment of deuterium re-absorption. The main result is that fuel retention in the re-exposed deposits is 30-40 times lower than that in the original co-deposit, showing that fuel re-absorption does not lead to an immediate re-saturation of deposits. Annealing at high temperatures enhances layer brittleness, leading eventually to detachment of co-deposits.

Place, publisher, year, edition, pages
2011. no T145, 014006- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-167922DOI: 10.1088/0031-8949/2011/T145/014006ISI: 000298475200007OAI: oai:DiVA.org:uu-167922DiVA: diva2:489117
Available from: 2012-02-02 Created: 2012-02-02 Last updated: 2017-12-08Bibliographically approved

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Petersson, Per

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