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P: Fachverband Plasmaphysik
P 11: Poster I
P 11.27: Poster
Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG
Electric probe measurements inside and outside of magnetic islands in the SOL of Wendelstein 7-X. — •Dario Cipciar1, Carsten Killer1, Olaf Grulke1, Jiri Adamek2, and W7-X Team1 — 1Max Planck Institute, Greifswald, Germany — 2IPP of the CAS, Prague, Czech Republic
We report on electric probe measurements in the Scrape-Off Layer (SOL) plasma of the W7-X stellarator. In this device, the SOL is formed by a chain of magnetic islands that separate the SOL into different topological regions and furthermore contain regions of closed magnetic field lines around the island centers ("O-points"). Measurements inside and outside of magnetic islands are performed using the multipurpose manipulator equipped with a probe head carrying 27 Langmuir and 2 ball-pen probes (BPPs). One of the BPPs is floating and measures the electron temperature and plasma potential and is used to cross-validate of the newly installed BPPs against triple probe measurements. The second BPP is in a swept regime for ion temperature measurements and will be compared to RFA results from similar discharges. The probe head also features poloidal and radial measurements of key fluctuating parameters (floating potential Vfl and ion saturation current Isat) and, inferred from these are the turbulent radial particle fluxes, radial and poloidal electric fields. With these measurements we aim to assess the SOL plasma profiles and turbulence.