Elephants, goldfishes and SOUL: a dissertation on forgetfulness and control systems

Adaptive Optics control systems accumulate differential measurements during closed loop operations to estimate turbulence and drive the deformable mirror. But have you ever wondered if your control system should be like an elephant, and never forget, or should it have a weak memory like a goldfish? Are measurement errors always zero mean or does static effects impact performance? Are commands high spatial frequencies good or are you wasting all the inter-actuator stroke for nothing? This work will try to answer these questions showing you results obtained during SOUL commissioning and analysing the impact of the values of the control system poles on Adaptive Optics. So be prepared to focus on forgetfulness and discover the advantages of being a goldfish in a digital world made of elephants.

[1]  Edmund Blair Bolles.  Remembering and Forgetting: An Inquiry into the Nature of Memory , 1988 .

[2]  J. Beckers.  ADAPTIVE OPTICS FOR ASTRONOMY: Principles, Performance, and Applications , 1993 .

[3]  J. Assmann,et al.  Collective Memory and Cultural Identity , 1995 .

[4]  J. Gonglewski,et al.  Control loop analysis and characterization for an adaptive optics experiment on the Starfire 3.5-m telescope , 1996 .

[5]  J. Hardy,et al.  Adaptive Optics for Astronomical Telescopes , 1998 .

[6]  S. Esposito,et al.  Pyramid Wavefront Sensor behavior in partial correction Adaptive Optic systems , 2001 .

[7]  Christophe Verinaud,et al.  On the nature of the measurements provided by a pyramid wave-front sensor , 2004 .

[8]  Umberto Eco.  The mysterious flame of Queen Loana : an illustrated novel , 2005 .

[9]  João Paulo Teixeira,et al.  The CMS experiment at the CERN LHC , 2008 .

[10]  Armando Riccardi,et al.  The adaptive secondary mirror for the Large Binocular Telescope: optical acceptance test and preliminary on-sky commissioning results , 2010, Astronomical Telescopes + Instrumentation.

[11]  Robert K. Tyson,et al.  Field Guide to Adaptive Optics, Second Edition , 2012 .

[12]  Gerard Rousset,et al.  Temporal analysis of aliasing in Shack-Hartmann wave-front sensing , 2012, Other Conferences.

[13]  Benoit Neichel,et al.  Mitigation of vibrations in adaptive optics by minimization of closed-loop residuals. , 2013, Optics express.

[14]  Carlo Baffa.  SKA pulsar search: technological challenges and best algorithms development , 2014, Astronomical Telescopes and Instrumentation.

[15]  Charles P. Cavedoni,et al.  Gemini multiconjugate adaptive optics system review - I. Design, trade-offs and integration , 2013, 1310.6199.

[16]  S. Esposito,et al.  PASSATA: object oriented numerical simulation software for adaptive optics , 2016, Astronomical Telescopes + Instrumentation.

[17]  Walter Seifert,et al.  Commissioning of the adaptive optics supported LUCI instruments at the Large Binocular Telescope: results , 2018, Astronomical Telescopes + Instrumentation.

[18]  L. Carbonaro,et al.  The ERIS adaptive optics system: from design to hardware , 2018, Astronomical Telescopes + Instrumentation.

[19]  Armando Riccardi,et al.  Bringing soul on sky , 2021, 2101.07091.

[20]  Enrico Pinna,et al.  Semianalytical error budget for adaptive optics systems with pyramid wavefront sensors , 2019, Journal of Astronomical Telescopes, Instruments, and Systems.