Siddiki, F. B. T., Barbui, T., Flom, E., Schmitz, O., Krychowiak, M., & W7-X Team, Max Planck Institute for Plasma Physics, Max Planck Society (2024). He / Ne Beam Line Ratio Spectroscopy to Investigate Plasma Boundary of Wendelstein 7-X Stellarator Fusion Experiment. Poster presented at Joint ICTP-IAEA School on Data for Modelling Atomic and Molecular Processes in Plasmas (ICTP 24), Trieste.