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13 December 2020 Mitigating wavefront error caused by sky subcooling of the ELT structure
Ronald Holzlöhner, Martin Brinkmann
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Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII; 114450Y (2020) https://doi.org/10.1117/12.2563285
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only
Abstract
Telescopes suffer from radiative subcooling against the night sky (“low-wind effect”), depending on wind speed, sky exposure and the emissivity of the surface finish. Critical structural elements in the ELT are the spider vanes, the vertical trusses in the telescope tube and the M4 Tower. We present an improved sky temperature model and 3D computational fluid dynamics simulations of the airflow inside the ELT dome with local temperatures and derive the wavefront error map in the pupil from it, using ray tracing. We discuss the optimal shape that M4 can achieve to correct the errors and report the wavefront residuals.
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Ronald Holzlöhner and Martin Brinkmann "Mitigating wavefront error caused by sky subcooling of the ELT structure", Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 114450Y (13 December 2020); https://doi.org/10.1117/12.2563285
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KEYWORDS
Wavefronts
Telescopes
3D modeling
Surface finishing
Turbulence
Computational fluid dynamics
Computer simulations
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