Abstract
We describe the methods used to mitigate the vibrations encountered in some of the instruments of the Gemini South telescope. We found a persistent vibration at 55Hz with others occurring occasionally at 14 and 100Hz. Two types of AO controllers -Kalman and H∞- were implemented in the MCAO Tip-Tilt loop. First results show clear improvements in vibration rejection and overall performance for these advanced controllers over the classical integrator. It is shown that the reduction in the standard deviation of residual slopes is highly dependent on turbulence, wind speed and vibration conditions, ranging -in slopes RMS- from an almost negligible reduction for high speed wind to a factor of 5 for a combination of low wind and strong vibrations.
Original language | English |
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Publication status | Published - 2011 |
Externally published | Yes |
Event | 2nd International Conference on Adaptive Optics for Extremely Large Telescopes, AO for ELT 2011 - Victoria, BC, Canada Duration: 25 Sept 2011 → 30 Sept 2011 |
Conference
Conference | 2nd International Conference on Adaptive Optics for Extremely Large Telescopes, AO for ELT 2011 |
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Country/Territory | Canada |
City | Victoria, BC |
Period | 25/09/11 → 30/09/11 |