Feasibility of line-ratio spectroscopy on helium and neon as edge diagnostic tool for Wendelstein 7-X

A beamemission spectroscopy system on thermal helium (He) and neon (Ne) has been set up at Wendelstein 7-X tomeasure edge electrontemperature and density profiles utilizing the line-ratio technique or its extension by the analysis of absolutely calibrated line emissions. The setup for a first systematic test of these techniques of quantitative atomic spectroscopy in the limiter startup phase (OP1.1) is reported together with firstmeasured profiles. This setup and the first results are an important test for developing the technique for the upcoming high density, lowtemperature islanddivertor regime.

Source: Review of Scientific Instruments - September 27, 2016 Category: Physics Authors: T. Barbui, M. Krychowiak, R. K önig, O. Schmitz, J. M. Muñoz Burgos, B. Schweer, A. Terra and W7-X Team Source Type: research