The Keck Wide Field Imager and deployable secondary mirror

Matthew V. Radovan; Rob Bertz; Jeff Cooke; Richard Dekany; Alex Delacroix; Jason Fucik; Peter R. Gillingham; Shanti Krishnan; Gregory Poole; Ray Seikel; Roger Smith; Nao Suzuki; Tony Travouillon; Bas Huisman; Arjo Bos

doi:10.1117/12.3019291

18 July 2024 The Keck Wide Field Imager and deployable secondary mirror

Matthew V. Radovan, Rob Bertz, Jeff Cooke, Richard Dekany, Alex Delacroix, Jason Fucik, Peter R. Gillingham, Shanti Krishnan, Gregory Poole, Ray Seikel, Roger Smith, Nao Suzuki, Tony Travouillon, Bas Huisman, Arjo Bos

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130961P (2024) https://doi.org/10.1117/12.3019291
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The Keck Wide Field Imager (KWFI) is a 1-degree field of view imager optimized to take advantage of the UV performance of the W.M. Keck Observatory located atop Mauna Kea in Hawaii. The project is an international collaboration between Swinburne University, ANU, AAO-Macquarie, Caltech, UC Observatories, and W.M. Keck Observatory. KWFI fills the 8m-class capability gap for deep, blue wide-field imaging and rapid-response follow-up necessary for many science cases, including cosmic reionization, transient astronomy at all wavelengths and messengers, and space mission main science aims. The instrument has a high-throughput, UV-sensitive design with an all-fused silica 4-lens element corrector system that operates from 300 – 1000 nm and achieves 0.4” 80% encircled energy diameter rms over the FOV within each photometric band. In 2022, we reported on the conceptual design of the imager that includes fast (~10 s) filter exchange of its 600 mm narrowband and broadband filters, fast (seconds) image processing and source identification, and CCD and CMOS detectors. More recently, the team has advanced the development of a Deployable Secondary Mirror (DM2), which will work with KWFI. The DM2 is a 1.4-meter lightweight, remotely deployable hexagonal secondary mirror to allow fast switching between KWFI and any Cassegrain or Nasmyth Instruments to enable rapid spectroscopic follow up of identified sources. We report here on the DM2 conceptual design, progress on the imager design, testing of the prototype filter exchange mechanism, and the interface of KWFI and the DM2 with the 30-year-old Keck Telescope.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Matthew V. Radovan, Rob Bertz, Jeff Cooke, Richard Dekany, Alex Delacroix, Jason Fucik, Peter R. Gillingham, Shanti Krishnan, Gregory Poole, Ray Seikel, Roger Smith, Nao Suzuki, Tony Travouillon, Bas Huisman, and Arjo Bos "The Keck Wide Field Imager and deployable secondary mirror", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130961P (18 July 2024); https://doi.org/10.1117/12.3019291

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