The effect of nitrogen seeding on ELM filaments

A.V. Bogomolov, I.G.J. Classen, A.J.H. Donne, H. Meyer, M. Dunne, P.A. Schneider, E. Wolfrum, B. Vanovac, R. Fischer, L. Frassinetti, N.C. Luhmann

Research output: Contribution to conferencePaperAcademic


The aim of this work is to study the effect of nitrogen gas puffing
on Edge Localized Modes (ELMs). Nitrogen seeding reduces the ELM
duration and often leads to the enhancement of the plasma confinement.
One of the theoretical explanations of ELM reduction under effect of
nitrogen are changes in the filamentary structure of ELMs. With the
help of the Electron Cyclotron Emission Imaging (ECEI) diagnostic
on the ASDEX-Upgrade (AUG) tokamak, experimental evidence for
this hypothesis was obtained. It is shown that nitrogen seeded ELMs
expel less filaments, the number of filaments in an ELM correlates
well with both the duration of the ELM crash and the ELM-related
pressure drop. The energy loss per filament event in the analysed shots
is estimated as 2.5 − 5 kJ.
Original languageEnglish
Number of pages20
Publication statusPublished - 1 Jan 2015
Event42nd European Physical Society Conference on Plasma Physics, (EPS 2015) - Centro Cultural de Belém (CCB), Lisbon, Portugal
Duration: 22 Jun 201526 Jun 2015
Conference number: 42


Conference42nd European Physical Society Conference on Plasma Physics, (EPS 2015)
Abbreviated titleEPS 2015
Internet address


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