An Adaptive secondary mirror (ASM) allows for the integration of adaptive optics (AO) into the telescope itself. Adaptive secondary mirrors, based on hybrid variable reluctance (HVR) actuator technology, developed by TNO, provide a promising path to telescope-integrated AO. HVR actuators have the advantage of allowing mirrors that are stiffer, more power efficient, and potentially less complex than similar, voice-coil based ASM's. We are exploring the application of this technology via a laboratory testbed that will validate the technical approach. In parallel, we are developing conceptual designs for ASMs at several telescopes including the Automated Planet Finder Telescope (APF) and for Keck Observatory. An ASM for APF has the potential to double the light through the slit for radial velocity measurements, and dramatically improved the image stability. An ASM for WMKO enables ground layer AO correction and lower background infrared AO observations, and provides for more flexible deployment of instruments via the ability to adjust the location of the Cassegrain focus.
@article{arxiv.2110.01692,
title = {Developing Adaptive Secondary Mirror Concepts for the APF and W.M. Keck Observatory Based on HVR Technology},
author = {Philip M. Hinz and Rachel Bowens-Rubin and Christoph Baranec and Kevin Bundy and Mark Chun and Daren Dillon and Brad Holden and Wouter Jonker and Molly Kosiarek and Renate Kupke and Stefan Kuiper and Olivier Lai and Jessica R. Lu and Matthew Maniscalco and Matthew Radovan and Sam Ragland and Stephanie Sallum and Andrew Skemer and Peter Wizinowich},
journal= {arXiv preprint arXiv:2110.01692},
year = {2021}
}