Magnetic configuration effects on the edge heat flux in the limiter plasma on W7-X measured using the infrared camera and the combined probe

P DREWS; H NIEMANN; J COSFELD; Y GAO; J GEIGER; O GRULKE; M HENKEL; D HÖSCHEN; K HOLLFELD; C KILLER; AKRÄMER-FLECKEN; Y LIANG; S LIU; D NICOLAI; O NEUBAUER; M RACK; B SCHWEER; G SATHEESWARAN; L RUDISCHHAUSER; N SANDRI; N WANG; the W-X Team

doi:10.1088/2058-6272/aaa968

Plasma Science and Technology > 2018 > 20(5): 54003-054003. > DOI: 10.1088/2058-6272/aaa968

P DREWS, H NIEMANN, J COSFELD, Y GAO, J GEIGER, O GRULKE, M HENKEL, D HÖSCHEN, K HOLLFELD, C KILLER, AKRÄMER-FLECKEN, Y LIANG, S LIU, D NICOLAI, O NEUBAUER, M RACK, B SCHWEER, G SATHEESWARAN, L RUDISCHHAUSER, N SANDRI, N WANG, the W-X Team. Magnetic configuration effects on the edge heat flux in the limiter plasma on W7-X measured using the infrared camera and the combined probe[J]. Plasma Science and Technology, 2018, 20(5): 54003-054003. DOI: 10.1088/2058-6272/aaa968

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Magnetic configuration effects on the edge heat flux in the limiter plasma on W7-X measured using the infrared camera and the combined probe

1 Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), D-52425 Jülich, Germany 2 Max-Planck-Institut für Plasmaphysik, Greifswald, Germany 3 Forschungszentrum Jülich GmbH, Central Institute for Engineering, Electronics and Analytics/ Engineering and Technology (ZEA-1), D-52425 Jülich, Germany 4 JARA-HPC, Germany 5 School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China

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

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Received Date: September 26, 2017

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Controlling the heat and particle fluxes in the plasma edge and on the plasma facing components is important for the safe and effective operation of every magnetically confined fusion device. This was attempted on Wendelstein 7-X in the first operational campaign, with the modification of the magnetic configuration by use of the trim coils and tuning the field coil currents, commonly named iota scan. Ideally, the heat loads on the five limiters are equal. However, they differ between each limiter and are non-uniform, due to the (relatively small) error fields caused by the misalignment of components. It is therefore necessary to study the influence of the configuration changes on the transport of heat and particles in the plasma edge caused by the application of error fields and the change of the magnetic configuration. In this paper the upfistream measurements conducted with the combined probe are compared to the downstream measurements with the DIAS infrared camera on the limiter.
- Wendelstein 7-X,
- W7-X,
- plasma edge,
- heat flux,
- limiter

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Magnetic configuration effects on the edge heat flux in the limiter plasma on W7-X measured using the infrared camera and the combined probe

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