Impact of He admixture on the ammonia formation in N2 seeded D2 plasmas in the GyM facility

Abstract In this contribution we present the results obtained during nitrogen seeding experiments performed in GyM. The aim of the experiments was to evaluate the variation of ammonia (ND3) formation in the presence of helium (He). Control of experimental conditions was performed by means Langmuir probe (LP) measurements. By Optical Emission Spectroscopy (OES), have been acquired spectra centred at about 336 nm, in this region falls the emission band of the ND radical, used as indicator of the ND3 production. ND3 formation during experiments has been followed by measures of the Residual Gas Analysis (RGA). ND3 quantification was achieved by operations involving the collection of the exhaust in LN2 trap and liquid ion chromatography (LIC) analysis. Results showed that increasing amounts of He added to a nitrogen seeding plasmas produces a proportional decrease in ND3 while the plasma parameters are not modified.