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

Graphical Abstract

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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References (16)

References

[1]	Klinger T et al 2017 Plasma Phys. Controlled Fusion 59 014018
[2]	Beidler C et al 1990 Fusion Technol. 17 148
[3]	Iiyoshi A et al 1990 Fusion Technol. 17 169
[4]	Pedersen T S et al 2015 Nucl. Fusion 55 126001
[5]	Wolf R C et al 2017 Nucl. Fusion 57 102020
[6]	Drews P et al 2017 Nucl. Fusion 57 126020
[7]	Nicolai D et al 2017 Fusion Eng. Des. 123 960
[8]	Satheeswaran G et al 2017 Fusion Eng. Des. 123 699
[9]	Morita S et al 2001 Phys. Scr. 2001 48
[10]	Dai S et al 2016 Nucl. Fusion 56 066005
[11]	Meister H et al 2003 Rev. Sci. Instrum. 74 4625
[12]	Kobayashi M et al 2018 Contrib. Plasma Phys 54 383
[13]	Drews P 2019 The role of magnetic topology in the edge plasma performance on W7-X PhD Thesis Heinrich Heine University Düsseldorf
[14]	Cosfeld J et al 2019 Nucl. Mater. Energy 18 307
[15]	Stangeby P C 2000 The Plasma Boundary of Magnetic Fusion Devices (Boca Raton, FL: CRC Press)
[16]	Tokar M Z 1994 Contrib. Plasma Phys. 34 139

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