Probe manipulators for Wendelstein 7-X and their interaction with the magnetic topology

M RACK; D HÖSCHEN; D REITER; B UNTERBERG; J W COENEN; S BREZINSEK; O NEUBAUER; S BOZHENKOV; G CZYMEK; Y LIANG; M HUBENY; Ch LINSMEIER; the Wendelstein -X Team

doi:10.1088/2058-6272/aaac78

Plasma Science and Technology > 2018 > 20(5): 54002-054002. > DOI: 10.1088/2058-6272/aaac78

M RACK, D HÖSCHEN, D REITER, B UNTERBERG, J W COENEN, S BREZINSEK, O NEUBAUER, S BOZHENKOV, G CZYMEK, Y LIANG, M HUBENY, Ch LINSMEIER, the Wendelstein -X Team. Probe manipulators for Wendelstein 7-X and their interaction with the magnetic topology[J]. Plasma Science and Technology, 2018, 20(5): 54002-054002. DOI: 10.1088/2058-6272/aaac78

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Probe manipulators for Wendelstein 7-X and their interaction with the magnetic topology

1 Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung—Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), D-52425 Jülich, Germany 2 JARA-HPC, D-52425 Jülich, Germany 3 Max-Planck-Institut für Plasmaphysik, D-17491 Greifswald/D-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: November 17, 2017

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Abstract

Abstract

Probe manipulators are a versatile addition to typical plasma edge diagnostics. Equipped with material samples they allow for detailed investigation of plasma–wall interaction processes, such as material erosion, deposition or impurity transport pathways. When combined with electrical probes, a study of scrape-off layer and plasma edge density, temperature and flow profiles as well as magnetic topologies is possible. A mid-plane manipulator is already in operation on Wendelstein 7-X. A system in the divertor region is currently under development. In the present paper we discuss the critical issue of heat and power loads, power redistribution and experimental access to the complex magnetic topology of Wendelstein 7-X. All the aforementioned aspects are of relevance for the design and operation of a probe manipulator in a device like Wendelstein 7-X. A focus is put on the topological region that is accessible for the different coil current configurations at Wendelstein 7-X and the power load on the manipulator with respect to the resulting different magnetic configurations. Qualitative analysis of power loads on plasma-facing components is performed using a numerical tracer particle diffusion tool provided via the Wendelstein 7-X Webservices.
- stellarators,
- Wendelstein 7-X,
- manipulator,
- divertor,
- power load

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References (16)

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Probe manipulators for Wendelstein 7-X and their interaction with the magnetic topology