Rayleigh scattering, Fratricide effect and spot elongation: first on-sky results with GeMS


B. Neichel F. Rigaut


Gemini Observatory


GeMS, the Gemini MCAO system, is undergoing commissioning. Using 5 laser guide stars and a central launch, GeMS is particularly sensitive to Rayleigh backscatter and the fratricide effect. Using data covering a 5 months period, we will present results on:
- Sodium return vs. Rayleigh background photons
- mitigations and possible strategies to fratricide
- Spot elongation measured
- Benefits of fratricide for Laser Launch Telescope centering, fast acquisition procedure, cloud detection
- Beam Transfer Optic design

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