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Dissociative recombination process of ammonium for HN-MAR in high density D-N plasmas.
- Source :
-
Physics of Plasmas . Dec2018, Vol. 25 Issue 12, pN.PAG-N.PAG. 8p. - Publication Year :
- 2018
-
Abstract
- Ammonia molecules formed in a nitrogen-seeded D-fueled plasma are shown to catalyze volumetric recombination of hydrogen ions. This Hydronitrogen Molecular Assisted Recombination (HN-MAR) process occurs by charge and ion exchange reactions with ammonia (ND3), leading to subsequent volumetric recombination with ND3+ and ND4+ molecular ions. When the plasma density is raised to the point where volumetric recombination dominates plasma losses to the wall [ne > 1018 m−3], a calibrated electrostatic quadrupole plasma analyzer shows that the ND4+ ammonium ion density fraction drops from 0.55 to 0.11. We show that this is consistent with a 0-d kinetics model that includes the HN-MAR process with rates that are proportional to the electron density. The results suggest that direct injection of ammonia would provide a more efficient pathway to achieve divertor detachment in future tokamak experiments. [ABSTRACT FROM AUTHOR]
- Subjects :
- *AMMONIA
*HYDROGEN ions
*IONS
*ELECTRON density
*TOKAMAKS
Subjects
Details
- Language :
- English
- ISSN :
- 1070664X
- Volume :
- 25
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Physics of Plasmas
- Publication Type :
- Academic Journal
- Accession number :
- 133872505
- Full Text :
- https://doi.org/10.1063/1.5056204