Abstract
In this contribution we present OES measurements in the JET tokamak of the deuterated NH (ND) radical and the correlation between results of those experiments and measurement of ammonia production. The observation region covers most of the divertor and its outer throat. Measurements are performed in different magnetic configurations. The results include temporal and spatial dependence of the molecular emission intensity and study of the emission band shape (vibrational and rotational temperatures) during different JET pulses, with or without nitrogen seeding. Results are a step towards the understanding of nitrogen-containing molecule creation and destruction in the divertor plasma.
Highlights
Studying the nitrogen plasma impurity is important in fusion plasmas, as this gas is both used for divertor temperature control and has an apparent beneficial effect on confinement
In this contribution we present Optical emission spectroscopy (OES) measurements in the JET tokamak of the deuterated NH (ND) radical and the correlation between results of those experiments and measurement of ammonia production
Optical emission spectroscopy (OES) of ammonia is very difficult, because this molecule does not have any strong bands in the visible region
Summary
Studying the nitrogen plasma impurity is important in fusion plasmas, as this gas is both used for divertor temperature control and has an apparent beneficial effect on confinement. The results include temporal and spatial dependence of the molecular emission intensity and study of the emission band shape (vibrational and rotational temperatures) during different JET pulses, with or without nitrogen seeding. This transition was observed in JET during first experiments with nitrogen seeding in the ITER-Like Wall (ILW) configuration [1].
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