Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 15: Helmholtz Graduate School II

P 15.26: Poster

Tuesday, March 14, 2017, 16:30–18:30, HS Foyer

Mirror Langmuir Probes for Turbulence Measurements in the Wendelstein 7-X Divertor — •Lukas Rudischhauser — IPP Greifswald, Germany

Transport in Wendelstein 7-X will be dominantly driven by turbulence, especially in the edge region. To measure fast plasma fluctuations with high temporal and spatial resolution, graphite probes embedded into the divertor will be used. We will simultaneously measure plasma density, temperature and potential during turbulent fluctuations which will provide insights into their effect on the divertor power density distribution. The novel Mirror Langmuir probe electronic conceived at MIT is ideally suited for the task of driving these probes and evaluating their characteristics and will be employed in a trial during the next operation phase of W7-X. The concept uses a matched dummy probe in conjunction with a Wheatstone bridge to negate transmission line effects and an analogue computer to predict optimal drive parameters. Here we present the design as well as test results and fluctuation measurements from the first operation phase of W7-X.