%0 Journal Article
%A COSFELD, J.
%A DREWS, P.
%A BLACKWELL, B.
%A JAKUBOWSKI, M.
%A NIEMANN, H.
%A ZHANG, D.
%A FENG, Y.
%T Numerical estimate of multi-species ion sound speed of Langmuir probe interpretations in the edge plasmas of Wendelstein 7-X
%J Plasma science & technology
%V 22
%N 8
%@ 1009-0630
%C Bristol
%I IOP
%M FZJ-2021-02671
%P 085102 -
%D 2020
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000537062200001
%R 10.1088/2058-6272/ab8974
%U https://juser.fz-juelich.de/record/893281