Altair performance and upgrades

Olivier Lai; Jean-Pierre Véran; Glen Herriot; John White; Jesse Ball; Chad Trujillo

doi:10.1117/12.2056948

21 July 2014 Altair performance and upgrades

Olivier Lai, Jean-Pierre Véran, Glen Herriot, John White, Jesse Ball, Chad Trujillo

Proceedings Volume 9148, Adaptive Optics Systems IV; 914838 (2014) https://doi.org/10.1117/12.2056948
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Altair is the facility single conjugate AO system for Gemini North. Although it has been in operation for more than 10 years (and upgraded to LGS in 2007), Altair's performance is degraded by three main issues: vibrations of the telescope and instrument support structure, spatial aliasing on centroid offsets from the M2 support structure print-through on the optical surface and static non-common path aberrations. Monte-Carlo simulations can reproduce the behavior of Altair when including these three effects and they are roughly of the same order of magnitude. Solutions or mitigations are being investigated to overcome these nefarious effects and restore Altair's performance to its nominal level. A simplex algorithm as well as a phase diversity approach are being investigated to measure and correct for static aberrations. A high accuracy phase map of the M2 print-through has been obtained and is being used to calibrate and/or filter centroids affected by aliasing. A new real time computer is under consideration, to be able to handle more advanced controllers, especially notch filters to combat vibrations. In this paper we will report on the various simulations and on-sky results of this rejuvenation of one of Gemini's workhorse instruments.

Citation Download Citation

Olivier Lai, Jean-Pierre Véran, Glen Herriot, John White, Jesse Ball, and Chad Trujillo "Altair performance and upgrades", Proc. SPIE 9148, Adaptive Optics Systems IV, 914838 (21 July 2014); https://doi.org/10.1117/12.2056948

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