Nanometer level characterization of the James Webb Space Telescope optomechanical systems using high-speed interferometry

Saif, Babak; Chaney, David; Smith, W. S.; Greenfield, P.; Hack, W.; Bluth, Josh; Otten, Austin Van; Bluth, Marcel; Sanders, James A.; Keski-Kuha, Ritva; Feinberg, Lee; North-Morris, Michael; Millerd, James E.

doi:10.1364/ao.54.004285

Cited by 25 publications

(7 citation statements)

References 4 publications

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“…28 Similarly, the response of JWST mirror segments to launch level acoustics and vibrations was modeled, tested and published. 29 The European Space Agency (ESA)'s large aperture telescope technology (LATT) project 30 built a 0.4 m active telescope optic for space and qualified it for space to technology readiness level (TRL)-5 via measurement of its response to launch loads. Overall, FEM approaches have improved our confidence that optical designs will survival launch, prior to test.…”

Section: History Of Astronomical Space Telescope Researchmentioning

confidence: 99%

Approaches to lowering the cost of large space telescopes

Douglas,

Aldering,

Allan

et al. 2023

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV

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New development approaches, including launch vehicles and advances in sensors, computing, and software, have lowered the cost of entry into space, and have enabled a revolution in low-cost, high-risk Small Satellite (SmallSat) missions. To bring about a similar transformation in larger space telescopes, it is necessary to reconsider the full paradigm of space observatories. Here we will review the history of space telescope development and cost drivers, and describe an example conceptual design for a low cost 6.5 m optical telescope to enable new science when operated in space at room temperature. It uses a monolithic primary mirror of borosilicate glass, drawing on lessons and tools from decades of experience with ground-based observatories and instruments, as well as flagship space missions. It takes advantage, as do large launch vehicles, of increased computing power and space-worthy commercial electronics in low-cost active predictive control systems to maintain stability. We will describe an approach that incorporates science and trade study results that address driving requirements such as integration and testing costs, reliability, spacecraft jitter, and wavefront stability in this new risk-tolerant "LargeSat" context.

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Section: History Of Astronomical Space Telescope Researchmentioning

confidence: 99%

Approaches to lowering the cost of large space telescopes

Douglas,

Aldering,

Allan

et al. 2023

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV

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“…When driven (in a horizontal configuration) at 87.3 Hz, they have an inertial astigmatic WFE of ∼220 nm per G of driving force. 40 There are two approaches for minimizing inertial WFE: make the mirror as stiff as possible to minimize its gravity sag and/or minimize the mirror's exposure to acceleration by minimizing thruster noise or isolating the mirror from such noise.…”

Section: Primary Mirror Substrate Designmentioning

confidence: 99%

“…Figure40 shows how well the modeled active zonal thermal enclosure controls the temperature of the PM. Once the science observation begins, the PM temperature only changes by AE0.15 mK.…”

mentioning

confidence: 99%

Habitable-Zone Exoplanet Observatory baseline 4-m telescope: systems-engineering design process and predicted structural thermal optical performance

Stahl

Kuan

Arnold

et al. 2020

J. Astron. Telesc. Instrum. Syst.

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The Habitable-Zone Exoplanet Observatory Mission (HabEx) is one of four large missions under review for the 2020 astrophysics decadal survey. Its goal is to directly image and spectroscopically characterize planetary systems in the habitable zone around nearby Sun-like stars. In addition, HabEx will perform a broad range of general astrophysics science enabled by a 115-to 1700-nm spectral range and 3 × 3 arcminute field of view. Critical to achieving its science goals, HabEx requires a large, ultrastable UV/optical/near-IR telescope. Using sciencedriven systems engineering, HabEx specified its baseline telescope to be a 4-m off-axis, unobscured three-mirror anastigmatic architecture with diffraction-limited performance at 400 nm, and wavefront stability on the order of a few tens of picometers. We summarize the systems-engineering approach to the baseline telescope assembly's optomechanical design, including a discussion of how science requirements drive the telescope's specifications. We also present structural thermal optical performance analysis showing that the baseline telescope structure meets its specified tolerances. We report new and updated analysis that is not in the HabEx final report. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…The Hartmann test is robust against dynamic jitter in the measurement because a large number of averages is possible. Along with the optical system tests of the JWST, measurements of the mechanical structure that supports the optical components are also carried out [212]. This test characterizes the impulse response function of the mechanical assembly to minimize and understand the optical performance degradation due to mechanical vibrations and even failures.…”

Section: Telescope Testingmentioning

confidence: 99%

Optics technology for large-aperture space telescopes: from fabrication to final acceptance tests

et al. 2018

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This review paper addresses topics of fabrication, testing, alignment, and as-built performance of reflective space optics for the next generation of telescopes across the x-ray to far-infrared spectrum. The technology presented in the manuscript represents the most promising methods to enable a next level of astronomical observation capabilities for space-based telescopes as motivated by the science community. While the technology to produce the proposed telescopes does not exist in its final form, the optics industry is making steady and impressive progress toward these goals across all disciplines. We hope that through sharing these developments in context of the science objectives, further connections and improvements are enabled to push the envelope of the technology.

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Nanometer level characterization of the James Webb Space Telescope optomechanical systems using high-speed interferometry

Cited by 25 publications

References 4 publications

Approaches to lowering the cost of large space telescopes

Approaches to lowering the cost of large space telescopes

Habitable-Zone Exoplanet Observatory baseline 4-m telescope: systems-engineering design process and predicted structural thermal optical performance

Optics technology for large-aperture space telescopes: from fabrication to final acceptance tests

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