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A method for molecular and atomic deuterium density evaluation, based on the analysis of the D-alpha spectral line shape coupled to a collisional radiative model, is presented. It is illustrated by its application to the plasma edge in the ergodic divertor configuration of the tokamak Tore Supra. An important molecular density (nD(2) greater than 1E18 m{-3}, 1 cm radially away from the neutraliser plate), of the same order as the total atomic density nD (nD/nD(2) almost equal to 1.4), is found for the entire range of edge electron temperatures (from 10 eV to 40 eV). The density ratio of D atoms created by charge exchange or reflection of deuterons on the neutraliser plate and D atoms coming from D(2) dissociation is approximately constant for electron temperatures larger than 20 eV (almost equal to 0.9). A reasonable agreement is found with the results of the multi-one-dimensional code EDCOLL and the three-dimensional Monte Carlo code BBQ. The influence of the electron temperature and density distributions along the spectroscopic line of sight on the measurements is discussed in the frame of simulations with the numerical code EDCOLL.

Additional information

Authors: ESCARGUEL A ET AL, Association EURATOM-CEA, CEA Cadarache, Saint Paul lez Durance (FR);HOGAN J, Oak Ridge National Laboratory (US);AZEROUAL A ET AL, Universite de Provence, Centre de Saint Jerome, Marseille (FR)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion, 43, December 2001, pp. 1733-1746
Record Number: 200214385 / Last updated on: 2002-02-14
Original language: en
Available languages: en