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Proceedings Paper

Observatory conceptual development for the Joint Dark Energy Mission
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Paper Abstract

The Joint Dark Energy Mission (JDEM)1,2 is a proposed dark energy space mission that will measure the expansion history of the universe and the growth of its large scale structure. It is intended to provide tight constraints on the equation of state of the universe and test the validity of general relativity. Three complementary observational analyses will be employed: Baryon Acoustic Oscillations, Type 1a Supernovae and Gravitational Weak Lensing. An observatory designed for efficient accommodation of these techniques combines wide-field, diffraction-limited observations, ultra-stable point spread function, and spectroscopy. In this paper we discuss optical configurations capable of simultaneous wide-field imaging and spectroscopy, using either afocal or focal telescope configurations. Spectroscopy may be performed by an integral field unit (IFU), grism or prism spectrometer. We present a flowdown of weak lensing image stability requirements (the most demanding technique optically) to telescope thermo-mechanical stability limits, based on variations in the optical transfer function of combinations of Zernike modes, and the sensitivity of these mode combinations to thermo-mechanical drift of the telescope. We apply our formalism to a representative threemirror anastigmat telescope and find quantitative relations between the second moments of the image and the required stability of the telescope over a typical weak lensing observation.

Paper Details

Date Published: 26 August 2009
PDF: 12 pages
Proc. SPIE 7436, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts IV, 743603 (26 August 2009); doi: 10.1117/12.828116
Show Author Affiliations
Michael J. Sholl, Lawrence Berkeley National Lab. (United States)
Gary M. Bernstein, Univ. of Pennsylvania (United States)
David A. Content, NASA Goddard Space Flight Ctr. (United States)
Michael G. Dittman, Ball Aerospace & Technologies Corp. (United States)
Joseph M. Howard, NASA Goddard Space Flight Ctr. (United States)
Michael L. Lampton, Lawrence Berkeley National Lab. (United States)
John P. Lehan, Univ. of Maryland, Baltimore County (United States)
J. Eric Mentzell, NASA Goddard Space Flight Ctr. (United States)
Robert A. Woodruff, Lockheed Martin Space Systems (United States)


Published in SPIE Proceedings Vol. 7436:
UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts IV
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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