Journal Article

FZJ-2021-02671

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Numerical estimate of multi-species ion sound speed of Langmuir probe interpretations in the edge plasmas of Wendelstein 7-X

COSFELD, J. (Corresponding author) ; DREWS, P. (Corresponding author)FZJ* ; BLACKWELL, B. ; JAKUBOWSKI, M. ; NIEMANN, H. ; ZHANG, D.FZJ* ; FENG, Y.

2020
IOP Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/28138  doi:10.1088/2058-6272/ab8974

Abstract: The recently modified EMC3-EIRENE code package has been widely applied as an edge-plasmaanalysis tool and resulted in successful validation against various measured trends seen instellarator and tokamak plasma boundaries. It has been shown that the code package applied forWendelstein 7-X (W7-X) discharges in the interpretive mode can assess the impact of impurityeffects on the electron density, measured by a set of Langmuir probes. In particular the spatialquantification of impurities and effects from the effective charge state Zeff and effective massmeff, which are non-trivial to record by diagnostics, were examined. The results showed thatearlier assumptions of the effective charge-state distribution and effective mass for reportedLangmuir probe measurements must be revised. Subsequently, reprocessing these measurementswith code-interpreted spatial profiles of the effective charge state and effective mass led to anoverall improved physical consistency.

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Contributing Institute(s):

1. JARA - HPC (JARA-HPC)
2. Plasmaphysik (IEK-4)

Research Program(s):

1. 172 - Tokamak Physics (POF3-172) (POF3-172)
2. 174 - Plasma-Wall-Interaction (POF3-174) (POF3-174)
3. 574 - Theory, modelling and simulation (POF3-574) (POF3-574)
4. 89574 - Theory, modelling and simulation (POF2-89574) (POF2-89574)
5. Predictive EMC3-EIRENE modelling and diagnostic interpretation for Wendelstein 7-X and EAST (jiek42_20180501) (jiek42_20180501)
6. Predictive EMC3-EIRENE modelling and diagnostic interpretation for Wendelstein 7-X and EAST (jiek42_20190501) (jiek42_20190501)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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