Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Plasma Diagnostics
P 5.5: Poster
Montag, 13. März 2017, 16:30–18:30, HS Foyer
Turbulence measurements in the Scrape-Off-Layer of Wendelstein 7-X — •Carsten Killer1, Olaf Grulke1, Dirk Nicolai2, Guruparan Satheeswaran2, Klaus-Peter Hollfeld3, Bernd Schweer2, Olaf Neubauer2, and W7-X Team1 — 1Max-Planck-Institute for Plasma Physics, Greifswald, Germany — 2Forschungszentrum Jülich, IEK4-Plasmaphysik, Jülich, Germany — 3Forschungszentrum Jülich, ZEA-1, Jülich, Germany
Turbulent transport in the Scrape-Off-Layer (SOL) is expected to be crucial for the upcoming divertor operation of Wendelstein 7-X. Electric probes are an established tool for both SOL profile characterization and turbulence measurements and are consequently also employed in W7-X. A fast reciprocating probe carrier mounted at the outboard mid-plane allows to scan the entire SOL up to the last closed flux surface. In this contribution, scenarios of probe measurements with respect to turbulence in the SOL of W7-X are explored. Fundamental parameters such as the SOL width and pressure decay length are deduced from profiles of plasma potential, density and temperature which are obtained utilizing sweeping Langmuir probes. A dedicated probe head designed for turbulence studies (comprising radial and poloidal probe arrays and a Mach probe) allows to investigate spectra and the radial-poloidal structure of fluctuations, poloidal and radial electric fields, parallel and perpendicular plasma flows and particle transport. The connection of the probe pins along a magnetic flux tube to other SOL diagnostics allows for benchmarking of results and for studies of the parallel structure and dynamics of turbulent plasma fluctuations.