Small telescope SCIDAR: turbulence profiling for ELT tomography

Ollie J. D. Farley; Richard Wilson; Ryan Griffiths

doi:10.1117/12.3019895

28 August 2024 Small telescope SCIDAR: turbulence profiling for ELT tomography

Ollie J. D. Farley, Richard Wilson, Ryan Griffiths

Proceedings Volume 13097, Adaptive Optics Systems IX; 130972R (2024) https://doi.org/10.1117/12.3019895
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Tomographic reconstruction at ELT scales requires knowledge of the high resolution optical turbulence profile Cn2(h). While in most cases this will be obtained through analysis of the AO telemetry, it is also important to have an independent site monitor that is capable of verifying these profiles, or providing profiles to "cold start" the system at the beginning of an observation. Here, we present the initial results of the pt5m-SCIDAR, a generalised-SCIDAR instrument operating on the robotic point-5 metre (pt5m, D=0.5m) telescope in La Palma. We show that despite the small aperture we are able to extract around 15-layer Cn2(h) profiles and explore the results of measurement campaigns with comparison to other site monitors around the observatory. We believe SCIDAR on smaller telescopes such as the pt5m presents a cost-effective solution as a site monitor for the Cn2(h) profile with sufficient resolution to support ELT tomography.

Conference Presentation

Citation Download Citation

Ollie J. D. Farley, Richard Wilson, and Ryan Griffiths "Small telescope SCIDAR: turbulence profiling for ELT tomography", Proc. SPIE 13097, Adaptive Optics Systems IX, 130972R (28 August 2024); https://doi.org/10.1117/12.3019895

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