TY  - JOUR
AU  - COSFELD, J.
AU  - DREWS, P.
AU  - BLACKWELL, B.
AU  - JAKUBOWSKI, M.
AU  - NIEMANN, H.
AU  - ZHANG, D.
AU  - FENG, Y.
TI  - Numerical estimate of multi-species ion sound speed of Langmuir probe interpretations in the edge plasmas of Wendelstein 7-X
JO  - Plasma science & technology
VL  - 22
IS  - 8
SN  - 1009-0630
CY  - Bristol
PB  - IOP
M1  - FZJ-2021-02671
SP  - 085102 -
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000537062200001
DO  - DOI:10.1088/2058-6272/ab8974
UR  - https://juser.fz-juelich.de/record/893281
ER  -