The Discovery Channel Telescope (DCT) is a 4.2m aperture telescope with a unique front end pod assembly that incorporates a secondary mirror assembly on one end, and a prime focus corrector group with focal plane instrument on the other. By flipping the pod end-for-end, the DCT is quickly converted from an f/6.13 Ritchey-Chretien telescope with a 21 arcminute field of view, to an f/1.9 two degree wide field prime focus camera. This paper describes the conceptual opto-mechanical design and performance assessment of the Prime Focus Assembly (PFA), including the pod interfaces, structures, optic mounts and the functions and configurations of the various mechanisms within the pod.
Frank Martin, Lawrence Lesyna, Robert LeRoy, Michael Menzel, Gregory Andersen, Brent Hyatt, Kenneth Triebes, Chuck Rudiger, Mark Stier, Charles Cox, Charles Delp, Roman Hachkowski, George Hardman, Michael Keane, Malcolm MacFarlane, Anthony Mordino, Michael Krim
An overview of the Lockheed Martin Team's NGST Reference Architecture is discussed. Our f/1 NGST concept includes a lightweight 8-meter primary mirror consisting of eight deployed petals. Alignment and figure control employs wavefront-sensing techniques. Infrared observations are enabled by using a tennis court size multi-layer deployed sunshield permitting the primary mirror to be passively cooled to < 40 K. Candidate Science Instruments cover the spectral range from 0.6 microns to greater than 20 microns. The Integrated Science Instrument Module (ISIM) is passively cooled to approximately 30 K. The Observatory is launched on an AtlasV-531M in 2008 and operates at the L2 LaGrange Point. Science Planning and Mission Operations are the responsibility of the Space Telescope Science Institute in Baltimore Maryland. The ISIM is the responsibility of Goddard Space Flight Center (GSFC). The Lockheed Martin Team, including Raytheon, Honeywell, and Jackson and Tull, is an NGST Phase 1 Prime Contractor. The GSFC manages the NGST Project in Greenbelt Maryland.
Rene Abreu, David Chadwick, Rick D'Amico, Charles Delp, Sarma Gullapalli, David Hansen, Michael Marchionna, Michael Meline, William Rappoport, Lou Mendyk, Ralph Pringle, Ker-Li Shu, William Swanson, William Zmek
After successful testing at the Raytheon facility in Danbury, Connecticut, the completed SAAO adaptive optical system has been shipped to the AEOS site on Haleakala, Maui, Hawaii. The system is undergoing final integration with the AEOS observatory. This paper describes the adaptive optics system design, including an overview of al major subsystems, the electronics, and the software. We discuss the design trades and system engineering that led to the final configuration. Also included is a review of opto-mechanical aspects of the system.
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