Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 15: Helmholtz Graduate School II

P 15.8: Poster

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

Development of Charge Exchange Recombination Spectroscopy in the Near Scrape-off Layer at ASDEX Upgrade — •Ulrike Plank^1,2, Thomas Pütterich^1,2, Marco Cavedon¹, Michael Griener¹, Eleonora Viezzer³, Ulrich Stroth¹, and The ASDEX Upgrade Team¹ — ¹Max 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 E_r 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 E_r up to the last closed flux surface (LCFS). A new CXRS diagnostic is now developed at ASDEX Upgrade which determines E_r 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.