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The deuterium D alpha line emitted in front of an equatorial neutraliser plate in Ergodic Divertor Tore Supra plasmas is a common diagnostic of recycling particles in present Tokamaks. First, the possible perturbation of the D alpha spectral line-shape by the nearby HeII line Br Beta has been studied. Although its effect on the D alpha line profile shape is evaluated to be non negligible in plasmas with large Helium contents, it is concluded that it should be of no influence in usual fusion plasmas. Second, a detailed study of the D alpha spectral line-shape has been performed to obtain temperatures and densities of the different neutral deuterium species.

A synthetic profile method taking into account Zeeman and Doppler effects has been used. This shows that two deuterium populations with specific behaviours have to be considered: the first one ( cold atoms ) is composed of atomic deuterium coming from D(2) desorbed from the neutraliser plate, while the second one ( warm atoms ) is composed of charge exchange (CX) and reflected deuterium. The possible heating of cold atoms by D+ ions is evaluated to explain this effect. Molecular and atomic deuterium densities behaviour versus edge electron temperature T(e)are analysed with the use of the warm and cold D alpha brightness coupled to a collisional radiative deuterium model. The results are compared to the numerical code EDCOLL.

Additional information

Authors: ESCARGUEL A ET AL, Département de recherche sur la fusion contrôlée, Association EURATOM/CEA, CEA Cadarache, Saint Paul lez Durance (FR);KOUBITT M, Physique des interactions ioniques et moléculaires, CNRS, Marseille (FR);STAMM R, Physique des interactions ioniques et moléculaires, CNRS, Marseille (FR);HOGAN J, Fusion Energy division, Oak Ridge National Laboratory, Oak Ridge (US);O'MULLANE M, JET Joint Undertaking, Abingdon (GB) and Department of Physics and Applied Physics, University of Strathclyde, Glasgow (GB)
Bibliographic Reference: An article published in: Contributions to Plasma Physics, Volume 42, Issue 6-7, (2002), pp. 622-629
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