Successful production of the engineering development unit (EDU) primary mirror segment and flight unit tertiary mirror for JWST

Arneson, Andrea; Alongi, Chris; Bernier, Rob; Boese, Ed; Daniel, Jay; Dettmann, Lee R.; Garfield, Robert E.; Glatzel, Holger; Kincade, J.; Johnson, Patrick; Lee, Allen; Magruder, Adam; Patel, Ankit; Seilonen, M.; Surges, Gary; Bergeland, Mark; Brown, Robert; Gallagher, Benjamin; McKay, Andrew; Cohen, Lester M.

doi:10.1117/12.858049

Cited by 4 publications

(4 citation statements)

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“…After bouncing off the primary mirror, photons will reflect off the 0.74 m secondary and enter the Aft Optics System located at the center of the primary [e.g., 22,23]. This contains a 0.73 × 0.52 m concave aspheric tertiary mirror that receives the incoming light beam, cancels out aberrations, and sends it to a flat fine steering mirror for image stabilization [24]. The fine steering mirror has a surface figure of <25 nanometer rms and adjusts continuously along two axes to suppress jitter and deliver diffraction limited performance (i.e., the optical system will produce images with a resolution as good as the theoretical limit for the telescope) [25].…”

Section: Observatory Designmentioning

confidence: 99%

Scientific discovery with the James Webb Space Telescope

Kalirai

2018

Contemporary Physics

118

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For the past 400 years, astronomers have sought to observe and interpret the Universe by building more powerful telescopes. These incredible instruments extend the capabilities of one of our most important senses, sight, towards new limits such as increased sensitivity and resolution, new dimensions such as exploration of wavelengths across the full electromagnetic spectrum, new information content such as analysis through spectroscopy, and new cadences such as rapid time-series views of the variable sky. The results from these investments, from small to large telescopes on the ground and in space, have completely transformed our understanding of the Universe; including the discovery that Earth is not the center of the Universe, that the Milky Way is one among many galaxies in the Universe, that relic cosmic background radiation fills all space in the early Universe, that that the expansion rate of the Universe is accelerating, that exoplanets are common around stars, that gravitational waves exist, and much more. For modern astronomical research, the next wave of breakthroughs in fields ranging over planetary, stellar, galactic, and extragalactic science motivate a general-purpose observatory that is optimized at nearand mid-infrared wavelengths, and that has much greater sensitivity, resolution, and spectroscopic multiplexing than all previous telescopes. This scientific vision, from measuring the composition of rocky worlds in the nearby Milky Way galaxy to finding the first sources of light in the Universe to other topics at the forefront of modern astrophysics, motivates the state-of-the-art James Webb Space Telescope (Webb). In this review paper, I summarize the design and technical capabilities of Webb and the scientific opportunities that it enables.

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Section: Observatory Designmentioning

confidence: 99%

Scientific discovery with the James Webb Space Telescope

Kalirai

2018

Contemporary Physics

118

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“…Enabling IOS technology has been applied to high-profile observatories including the repair of the Hubble Space Telescope, and fabrication of critical optics for the Spitzer Observatory, the Kepler Photometer and James Webb Space Telescope PM, SM, TM and FSM mirrors [2][3][4][5]. Many of these optical solutions have been possible due to the Computer Controlled Optical Surfacing (CCOS) Technology developed and practiced within IOS with particular strength in addressing difficult aspheric forms yielding smooth surface error power spectral densities.…”

Section: Optical Contextmentioning

confidence: 99%

Spaceborne telescopes on a budget: paradigms for producing high-reliability telescopes, scanners, and EO assemblies using heritage building blocks

Hull

Schwalm

2011

Sensors and Systems for Space Applications IV

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By starting with established and flown hardware (high Technology Readiness Level (TRL)), and implementing a concurrent engineering environment and seamless team, a mission architect can achieve high reliability and high performance while operating under constrained cost and short implementation schedule. We will describe methods, including those used by the telescope team on the recent Wide-field Infrared Survey Explorer (WISE) mission, to manage cost and realize aggressive schedules. These lessons may be evoked for telescopes addressing defense, security and sensing, as well as those for NASA science.

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“…Traditional used technique for large-aperture fabrication is small tool polishing, such as computer controlled optical surfacing (CCOS) polishing method for the Primary Mirror segment and flight unit Tertiary Mirror for James Webb Space Telescope (JWST; Arneson et al, 2010). Newly developed methods involve magnetorheological finishing (MRF; Miao et al, 2009) and bonnet polishing (Rao et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Non-Newtonian hydrodynamic modeling of electrorheological finishing feature based on wheel-like finishing tool

Feng

Cheng

2016

Journal of Intelligent Material Systems and Structures

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Electrorheological finishing method is a promising method for small parts fabrication. The small footprint of the tool can provide material removal by virtue of numerical control machine. The characteristics of electrorheological polishing fluid is tested by Haake CV20 rheometer. The dependence of shear stress and viscosity of the electrorheological polishing fluid under different supply voltage, as well as the field dependence of shear stress of ER polishing fluid at different shear rate, was obtained. Hydrodynamic pressure model in working area was studied based on the phenomenon of hydrodynamic lubrication theory of Bingham fluid, and it is proved that the pressure distribution is the dominant factor on the footprint shape. The experiments further showed that the efficiency of material removal is a combined action of hydrodynamic pressure and wheel speed.

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Successful production of the engineering development unit (EDU) primary mirror segment and flight unit tertiary mirror for JWST

Cited by 4 publications

References 0 publications

Scientific discovery with the James Webb Space Telescope

Scientific discovery with the James Webb Space Telescope

Spaceborne telescopes on a budget: paradigms for producing high-reliability telescopes, scanners, and EO assemblies using heritage building blocks

Non-Newtonian hydrodynamic modeling of electrorheological finishing feature based on wheel-like finishing tool

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