Numerical estimate of multi-species ion sound speed of Langmuir probe interpretations in the edge plasmas of Wendelstein 7-X

J COSFELD; P DREWS; B BLACKWELL; M JAKUBOWSKI; H NIEMANN; D ZHANG; Y FENG; the Wendelstein -X Team

doi:10.1088/2058-6272/ab8974

Plasma Science and Technology > 2020 > 22(8): 85102-085102. > DOI: 10.1088/2058-6272/ab8974

J COSFELD, P DREWS, B BLACKWELL, M JAKUBOWSKI, H NIEMANN, D ZHANG, Y FENG, the Wendelstein -X Team. Numerical estimate of multi-species ion sound speed of Langmuir probe interpretations in the edge plasmas of Wendelstein 7-X[J]. Plasma Science and Technology, 2020, 22(8): 85102-085102. DOI: 10.1088/2058-6272/ab8974

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Numerical estimate of multi-species ion sound speed of Langmuir probe interpretations in the edge plasmas of Wendelstein 7-X

¹ Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
² JARA-HPC, Jülich Supercomputing Centre, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
³ Australian National University, Acton ACT, 2601 Canberra, Australia
⁴ Max-Plank-Insitut für Plasmaphysik, 17491 Greifswald/85748 Garching, Germany

Funds: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under Grant Agreement No. 633053.

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Received Date: December 04, 2019
Revised Date: April 13, 2020
Accepted Date: April 14, 2020

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Abstract

Abstract

The recently modified EMC3-EIRENE code package has been widely applied as an edge-plasma analysis tool and resulted in successful validation against various measured trends seen in stellarator and tokamak plasma boundaries. It has been shown that the code package applied for Wendelstein 7-X (W7-X) discharges in the interpretive mode can assess the impact of impurity effects on the electron density, measured by a set of Langmuir probes. In particular the spatial quantification of impurities and effects from the effective charge state Z eff and effective mass m eff, which are non-trivial to record by diagnostics, were examined. The results showed that earlier assumptions of the effective charge-state distribution and effective mass for reported Langmuir probe measurements must be revised. Subsequently, reprocessing these measurements with code-interpreted spatial profiles of the effective charge state and effective mass led to an overall improved physical consistency.
- Wendelstein 7-X,
- plasma-wall interaction,
- numerical-diagnostics,
- EMC3-EIRENE

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Numerical estimate of multi-species ion sound speed of Langmuir probe interpretations in the edge plasmas of Wendelstein 7-X