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Proceedings Paper

A general tool for evaluating high-contrast coronagraphic telescope performance error budgets
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Paper Abstract

This paper describes a general purpose Coronagraph Performance Error Budget (CPEB) tool that we have developed under the NASA Exoplanet Exploration Program. The CPEB automates many of the key steps required to evaluate the scattered starlight contrast in the dark hole of a space-based coronagraph. It operates in 3 steps: first, a CodeV or Zemax prescription is converted into a MACOS optical prescription. Second, a Matlab program calls ray-trace code that generates linear beam-walk and aberration sensitivity matrices for motions of the optical elements and line-ofsight pointing, with and without controlled coarse and fine-steering mirrors. Third, the sensitivity matrices are imported by macros into Excel 2007 where the error budget is created. Once created, the user specifies the quality of each optic from a predefined set of PSDs. The spreadsheet creates a nominal set of thermal and jitter motions and combines them with the sensitivity matrices to generate an error budget for the system. The user can easily modify the motion allocations to perform trade studies.

Paper Details

Date Published: 20 August 2009
PDF: 12 pages
Proc. SPIE 7440, Techniques and Instrumentation for Detection of Exoplanets IV, 74400V (20 August 2009); doi: 10.1117/12.827299
Show Author Affiliations
Luis F. Marchen, Jet Propulsion Lab. (United States)
Stuart B. Shaklan, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 7440:
Techniques and Instrumentation for Detection of Exoplanets IV
Stuart B. Shaklan, Editor(s)

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