A new adaptive secondary mirror for astronomy on the University of Hawaii 2.2-meter telescope

Mark R Chun (1) , Christoph Baranec (2) , Olivier Lai (3, 4, 5, 6) , Jessica R Lu (7) , Ruihan Zhang (8) , Stefan Kuiper , Wouter Jonker , Matthew Maniscalco

1 Institute for astronomy [Hilo, Hawaï]
2 University of Hawai'i [Hilo]
3 LAGRANGE - Joseph Louis LAGRANGE
4 UniCA - Université Côte d'Azur
5 CNRS - Centre National de la Recherche Scientifique
6 Observatoire de la Côte d'Azur
7 Department of Astronomy [Berkeley]
8 Shanghai Institute of Materia Medica - Chinese Academy of Sciences [Shanghai]

We are developing a new adaptive secondary mirror (ASM) for the University of Hawaii 2.2-meter telescope based on a novel and very efficient hybrid variable reluctance actuator developed by TNO. The actuator technology has broad implications on the ASM design and results in an ASM with a thicker facesheet, lower power dissipation, and simple controls. We report here preparations and plans for lab testing as well as on-sky demonstration of the ASM. The lab calibrations of the ASM influence functions will use a phase measuring deflectometry setup. The on-sky tests will include the evaluation of the use of the ASM for narrow field AO observations at visible through near infrared wavelengths, for very wide fields of view ground-layer adaptive optics, and for seeing limited non-adaptive optics observations.

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

Mark R Chun, Christoph Baranec, Olivier Lai, Jessica R Lu, Ruihan Zhang, et al.. A new adaptive secondary mirror for astronomy on the University of Hawaii 2.2-meter telescope. SPIE Astronomical Telescopes + Instrumentation, Dec 2020, Online Only, France. pp.52, ⟨10.1117/12.2562847⟩. ⟨hal-03371091⟩