The Terrestrial Planet Finder Coronagraph dynamics error budget

Shaklan, Stuart; Marchen, Luis; Green, Joseph J.; Lay, Oliver P.

doi:10.1117/12.617890

Cited by 12 publications

(9 citation statements)

References 16 publications

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“…In our earlier work 7,8 we reported a single contrast value at each of several locations in the image plane. Here we show how the reported value was related to the parameter variances.…”

Section: Image Plane Contrast Equationmentioning

confidence: 99%

“…6 The performance of the optical system is extremely sensitive to slight temporal changes in the wavefront attributed mainly to motions the secondary mirror, bending of the primary mirror, line-of-sight pointing errors, and motion of the coronagraph instrument. 7,8 For example, motions of a few nanometers of the secondary mirror, or bending by a few picometers of the primary mirror, induce wavefront changes that scatter > 10 -10 of the light into the so-called high-contrast "dark-hole. "…”

Section: Introductionmentioning

confidence: 99%

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Have confidence in your coronagraph: statistical analysis of high-contrast coronagraph dynamics error budgets

et al. 2014

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We have combined our Excel-based coronagraph dynamics error budget spreadsheets with DAKOTA scripts to perform statistical analyses of the predicted dark-hole contrast. Whereas in the past we have reported the expected contrast level for an input set of allocated parameters, we now generate confidence intervals for the predicted contrast. Further, we explore the sensitivity to individual or groups of parameters and model uncertainty factors through aleatory-epistemic simulations based on a surrogate model fitted to the error budget. We show example results for a generic high-contrast coronagraph.

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“…In our earlier work 7,8 we reported a single contrast value at each of several locations in the image plane. Here we show how the reported value was related to the parameter variances.…”

Section: Image Plane Contrast Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Have confidence in your coronagraph: statistical analysis of high-contrast coronagraph dynamics error budgets

et al. 2014

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“…At this close proximity to the core of the point spread function, the scattered light level is highly sensitive to minute changes in the system's low-order wavefront, and will require control of focus, astigmatism, coma, trefoil, and spherical aberration to levels of a few picometers during detection and characterization integrations. 7,8 It will be extremely challenging to reach the detection goal of 10 -9 contrast at 100 mas for wavelengths greater than 500 nm (IWA < 2.4 /D). Thus the 400 -500 nm band may serve as a planet discovery band while characterization across the full spectrum may be possible for planets at >200 mas separation from their host stars.…”

Section: Instrument Characteristicsmentioning

confidence: 99%

The AFTA coronagraph instrument

et al. 2013

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The Astrophysics Focused Telescope Assets (AFTA) study in 2012-2013 included a high-contrast stellar coronagraph to complement the wide-field infrared survey (WFIRST) instrument. The idea of flying a coronagraph on this telescope was met with some skepticism because the AFTA pupil has a large central obscuration with six secondary mirror struts that impact the coronagraph sensitivity. However, several promising coronagraph concepts have emerged, and a corresponding initial instrument design has been completed. Requirements on the design include observations centered 0.6 deg off-axis, on-orbit robotic serviceability, operation in a geosynchronous orbit, and room-temperature operation (driven by the coronagraph's deformable mirrors). We describe the instrument performance requirements, the optical design, an observational scenario, and integration times for typical detection and characterization observations.

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“…The top level jitter requirements are formulated in terms of contrast 6 . The contrast has contributions from the following sources:…”

Section: Requirementsmentioning

confidence: 99%

Passive isolator design for jitter reduction in the Terrestrial Planet Finder Coronagraph

Blaurock¹,

Liu

Dewell

et al. 2005

SPIE Proceedings

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Terrestrial Planet Finder (TPF) is a mission to locate and study extrasolar Earthlike planets. The TPF Coronagraph (TPF-C), planned for launch in the latter half of the next decade, will use a coronagraphic mask and other optics to suppress the light of the nearby star in order to collect visible light fkom such planets. The required contrast ratio of 5e-11 can only be achieved by maintaining pointing accuracy to 4 milli-arcseconds, and limiting optics jitter to below 5 rim. Numerous mechanical disturbances act to induce jitter. This paper concentrates on passive isolation techniques to minimize the optical degradation introduced by disturbance sources. A passive isolation system, using compliant mounts placed at an energy bottleneck to reduce energy transmission above a certain frequency, is a low risk, flight proven design approach. However, the attenuation is limited, compared to an active system, so the feasibility of the design must be demonstrated by analysis. The paper presents the jitter analysis for the baseline TPF design, using a passive isolation system. The analysis model representing the dynamics of the spacecraft and telescope is described, with emphasis on passive isolator modeling. Pointing and deformation metrics, consistent with the TPF-C error budget, are derived. Jitter prediction methodology and results are presented. Then an analysis of the critical design parameters that drive the TPFC ~ jitter response is performed.

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The Terrestrial Planet Finder Coronagraph dynamics error budget

Cited by 12 publications

References 16 publications

Have confidence in your coronagraph: statistical analysis of high-contrast coronagraph dynamics error budgets

Have confidence in your coronagraph: statistical analysis of high-contrast coronagraph dynamics error budgets

The AFTA coronagraph instrument

Passive isolator design for jitter reduction in the Terrestrial Planet Finder Coronagraph

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