Grulke, O.

Hirsch, M.

Klinger, T.

Krämer-Flecken, A.

Weir, G.

Windisch, T.

English

MPG.PuRe

Correlation microwave diagnostics on the Wendelstein 7-X stellarator for Operational Phase 2 G.M. Weir1, A. Krämer-Flecken2, T. Windisch1, O. Grulke1, M. Hirsch1, T. Klinger1 and the Wendelstein 7-X team1 1Max-Planck-Institute for Plasma Physics, Greifswald, Germany 2Forschungszentrum Jülich, Institut für Energie- und Klimaforschung/Plasmaphysik, Jülich, Germany Correlation microwave radiometry and reflectometry diagnostics are used to measure electron temperature and plasma density fluctuations on Wendelstein 7-X (W7-X) [1] and the capabilities of these diagnostics are being extended for the second operational phase of W7-X. The ZOOM device [2] is a 16-channel, frequency scannable radiometer extension that is used as a high-resolution radial correlation electron cyclotron emission (CECE) diagnostic when connected to the ECE radiometer on W7-X [3]. A new toroidally displaced radial correlation system with a focusing antenna has been installed that is optimized for core electron temperature fluctuation measurements between 30% and 70% of the plasma minor radius. A secondary CECE antenna has also been installed for plasma density-electron temperature cross phase measurements in the outer 80% of the plasma minor radius. The poloidal correlation reflectometer (PCR) diagnostic [4] measures plasma density fluctuations in the same toroidal plane as the new CECE antennas and has overlapping measurement volumes. A second frequency synthesizer and detection system has been added to the PCR system allowing access to plasma densities up to 4.5x1019 m-3 and radial correlation length measurements in the outer 80% of plasma minor radius.   [1] T. Klinger et al., Plasma Phys. Control. Fusion 59 014018 (2017). [2] Ch. Fuchs and H.J. Hartfuss, Rev. Sci. Instrum. 72 383 (2001). [3] M. Hirsch et al., EPJ Web of Conferences 203, 03007 (2019).  [4] A. Krämer-Flecken, S. Soldatov, B. Vowinkel, and P. Müller, Rev. Sci. Instrum. 81 113502 (2010).    48th EPS Conference on Plasma Physics P1b.111

Correlation microwave diagnostics on the Wendelstein 7-X stellarator for Operational Phase 2

http://hdl.handle.net/21.11116/0000-000C-16B5-F

Correlation microwave diagnostics on the Wendelstein 7-X stellarator for Operational Phase 2

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MPG.PuRe