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FP7

Calculation of heat flux and evolution of equivalent thermal contact resistance of carbon deposits on Tore Supra neutralizer

Funded under: FP7-EURATOM

Abstract

This paper presents a new heat flux computation applied to the neutralizer of Tore Supra using a deconvolution procedure and the thermal quadrupoles method. A steady deposition of carbon takes place at a rate of about 30 nm/s on the actively cooled carbon fibre composite (CFC) surface of the neutralizer. Thermal measurements of the surface temperature are available through optical fibre-based infrared thermography. These measurements are used to estimate the heat flux and to follow the temporal evolution of a single parameter, representing the thermal properties of the growing thin carbon layer. This parameter corresponds to an equivalent thermal resistance R(eq) (in m{2} K W{-1}). During the first 2000 s of plasma operation on a new CFC neutralizer surface, R(eq) rises about proportionally with exposure time. From then on no significant further evolution of R(eq) is observed. We interpret this as indication for a thermal and mechanical detachment of the deposit from the substrate for deposits exceeding a thickness of 60 micrometer.

Additional information

Authors: GARDAREIN J-L, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);REICHLE R, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);POCHEAU C, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);RIGOLLET F, Université de Provence, Marseille (FR);LE NILIOT C, Université de Provence, Marseille (FR)
Bibliographic Reference: An article published in: Fusion Engineering and Design, Volume 83, Issues 5-6, (2008), 7 pp.
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1016/j.fusengdes.2008.07.018
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