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Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 15: Helmholtz Graduate School II

P 15.8: Poster

Dienstag, 14. März 2017, 16:30–18:30, HS Foyer

Development of Charge Exchange Recombination Spectroscopy in the Near Scrape-off Layer at ASDEX Upgrade — •Ulrike Plank1,2, Thomas Pütterich1,2, Marco Cavedon1, Michael Griener1, Eleonora Viezzer3, Ulrich Stroth1, and The ASDEX Upgrade Team11Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany — 2Faculty of Physics, Ludwig Maximilian University of Munich, Schellingstr. 4, 80799 Munich, Germany — 3Dpt. of Atomic, Molecular and Nuclear Physics, University of Seville, Avda. Reina Mercedes, 41012 Seville, Spain

The radial electric field Er at the plasma edge is known to influence the access and quality of the high confinement mode in magnetically confined fusion plasmas. Traditional charge exchange recombination spectroscopy (CXRS) on fully stripped ions (e.g. B5+) measures Er up to the last closed flux surface (LCFS). A new CXRS diagnostic is now developed at ASDEX Upgrade which determines Er in the near scrape-off layer (SOL) by CX measurements on partially stripped species (e.g. B3+) which exist in the radial vicinity of the LCFS. This system will complement measurements of probes in the SOL and of Doppler reflectometry across the edge region. The new CXRS diagnostic utilizes a piezo gas valve injecting deuterium into the edge plasma. This allows local measurements on thermal CX reactions and makes the diagnostic independent of the neutral beam injection. Details of the construction and the calibration methods as well as first measurements will be presented.

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