2004
DOI: 10.1117/12.550091
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Optical performance for the James Webb Space Telescope

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Cited by 24 publications
(9 citation statements)
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“…Pessimistic estimates of thermal instabilities induced by slewing JWST from its coldest to its warmest attitudes are included in the JWST Project's Rev-T wavefront error models. 21,[23][24][25] Numerical estimates of binary point source contrast using closure phases and squared visibilities with a two day interval between the calibrator and target, and the models' worst-case thermal drift of JWST's structure, indicate a contrast of 12 magnitudes between 75 to 450 mas is achievable under these assumptions. Thus thermal drifts of the telescope wavefront are not expected to be significant obstacles to acheiving scientifically interesting contrast.…”
Section: Niriss Ami and Future Space-based Nrmmentioning
confidence: 96%
“…Pessimistic estimates of thermal instabilities induced by slewing JWST from its coldest to its warmest attitudes are included in the JWST Project's Rev-T wavefront error models. 21,[23][24][25] Numerical estimates of binary point source contrast using closure phases and squared visibilities with a two day interval between the calibrator and target, and the models' worst-case thermal drift of JWST's structure, indicate a contrast of 12 magnitudes between 75 to 450 mas is achievable under these assumptions. Thus thermal drifts of the telescope wavefront are not expected to be significant obstacles to acheiving scientifically interesting contrast.…”
Section: Niriss Ami and Future Space-based Nrmmentioning
confidence: 96%
“…IM mainly supported JWST Missions Systems Engineering for verification of the Technical Performance Metrics (TPMs) of the Image Quality (IQ) and Environmental requirements. The IQ requirements were presented in section 1.1, and are the basis for lower-level requirements and allocations captured in the error budgets presented in section 1.2 (thermal and vibration impacts to alignment stability, wavefront stability and image motion), as well as performance aspects not addressed in this paper, including the much larger shifts in alignment as the telescope cools down from ambient to cold temperatures, and the quasi-static wavefront shifts resulting from periodic wavefront sensing and control corrections 14 . The Sensitivity requirement is the basis for allocations to radiometric performance, stray light suppression and detector performance.…”
Section: The Role Of Integrated Modelingmentioning
confidence: 99%
“…These OPDs, 2 provided with the JWPSF 3 software distribution, represent the wavefront in the NIRCam short-wavelength channel assuming low-, mid-, and high-spatial frequency wavefront error allocations to the Optical Telescope Element (OTE) and Integrated Science Instrument Module (ISIM), as defined by "Revision T" of the the JWST optical error budget. 4 The OPDs themselves are presented in physical units (microns), allowing for a single OPD to be used for analyses at several different wavelengths (see Fig. 1).…”
Section: Optical Path Difference Modelsmentioning
confidence: 99%