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Proceedings Paper

The Terrestrial Planet Finder Coronagraph dynamics error budget
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Paper Abstract

The Terrestrial Planet Finder Coronagraph (TPF-C) demands extreme wave front control and stability to achieve its goal of detecting earth-like planets around nearby stars. We describe the performance models and error budget used to evaluate image plane contrast and derive engineering requirements for this challenging optical system. We show that when the coronagraph is coupled to an 8th-order band-limited mask, the performance is limited by shearing of the starlight beam across imperfect optics (a.k.a. beam walk), and that this in turn demands tight rigid body pointing, sub-milliarcsecond fine guiding, high-quality optics, and sub-micron positional stability of the optics including the secondary mirror. Additionally we show that the stability of low-order aberrations (focus, astigmatism, coma, and trefoil) is required to be ~ 2-4 Angstroms, while higher-order modes must remain stable to a few picometers.

Paper Details

Date Published: 14 September 2005
PDF: 12 pages
Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 59050D (14 September 2005); doi: 10.1117/12.617890
Show Author Affiliations
Stuart B. Shaklan, Jet Propulsion Lab. (United States)
Luis Marchen, Jet Propulsion Lab. (United States)
Joseph J. Green, Jet Propulsion Lab. (United States)
Oliver P. Lay, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5905:
Techniques and Instrumentation for Detection of Exoplanets II
Daniel R. Coulter, Editor(s)

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