Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Evolution of nitrogen concentration and ammonia production in N-2-seeded H-mode discharges at ASDEX Upgrade
 
research article

Evolution of nitrogen concentration and ammonia production in N-2-seeded H-mode discharges at ASDEX Upgrade

Drenik, A.
•
Laguardia, L.
•
McDermott, R.
Show more
April 1, 2019
Nuclear Fusion

Ammonia formation was studied in a series of dedicated nitrogen seeded H-mode discharges at ASDEX Upgrade. The evolution of ammonia formation was investigated with a reference phase before the seeding, and a long, stable flat-top nitrogen-seeded phase. It was monitored with divertor spectroscopy and analysis of the exhaust gas. The amount of the detected ammonia increased continuously over the course of five discharges with the same nitrogen seeding rate. The same trend was observed in the nitrogen density in the core plasma, as measured by charge exchange recombination spectroscopy and other signals, linked to the effects of nitrogen seeding. The results show that the rate of ammonia formation exhibited the same trend as the nitrogen density in the plasma. This density, in turn, was strongly influenced by the nitrogen wall inventory. The spatial distribution of the detected ammonia suggests that a significant contribution to the net ammonia formation is made in plasma-shaded areas, through surface reactions of neutral species.

  • Details
  • Metrics
Type
research article
DOI
10.1088/1741-4326/aafe23
Web of Science ID

WOS:000458127100004

Author(s)
Drenik, A.
Laguardia, L.
McDermott, R.
Meisl, G.
Neu, R.
Oberkofler, M.
Pawelec, E.
Pitts, R. A.
Puetterich, T.
Reichbauer, T.
Show more
Date Issued

2019-04-01

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

59

Issue

4

Article Number

046010

Subjects

Physics, Fluids & Plasmas

•

Physics

•

plasma-surface interaction

•

asdex upgrade

•

mass spectrometry

•

ammonia

•

nitrogen seeding

•

residual gas analysis

•

n-2-h-2 flowing discharges

•

consistent kinetic-model

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
June 18, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/158139
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés