High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal.
Rev Sci Instrum
; 87(11): 11E545, 2016 Nov.
Article
em En
| MEDLINE
| ID: mdl-27910689
ABSTRACT
A new high spatial resolution main-ion (deuterium) charge-exchange spectroscopy system covering the tokamak boundary region has been installed on the DIII-D tokamak. Sixteen new edge main-ion charge-exchange recombination sightlines have been combined with nineteen impurity sightlines in a tangentially viewing geometry on the DIII-D midplane with an interleaving design that achieves 8 mm inter-channel radial resolution for detailed profiles of main-ion temperature, velocity, charge-exchange emission, and neutral beam emission. At the plasma boundary, we find a strong enhancement of the main-ion toroidal velocity that exceeds the impurity velocity by a factor of two. The unique combination of experimentally measured main-ion and impurity profiles provides a powerful quasi-neutrality constraint for reconstruction of tokamak H-mode pedestals.
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MEDLINE
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En
Revista:
Rev Sci Instrum
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Estados Unidos