Authors

B. Neichel F. Rigaut

Affiliations

Gemini Observatory

Abstract

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