&lt;title&gt;In-process status of the 1.4-m beryllium semi-rigid Advanced Mirror System Demonstrator (AMSD)&lt;/title&gt;

Kendrick, Stephen E.; Reed, Timothy; Streetman, Scott

doi:10.1117/12.453654

Cited by 5 publications

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“…Ball Aerospace, Goodrich, and Kodak were the winning vendors 9 , 20 – 25 All of these mirrors were 1.3 to 1.4-m point to point—just the size needed to produce a segmented primary mirror 6 to 8 m in diameter—and had an areal density of ∼15 kg/m2.…”

Section: Mirror Technology Developmentmentioning

confidence: 99%

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Webb Space Telescope primary mirror development: summary and lessons learned

Stahl

2024

J. Astron. Telesc. Instrum. Syst.

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The primary mirror is central to the success of the Webb Space Telescope and the product of 100s of engineers and technologists who invented technologies and processes for its manufacture and test. We summarize the Webb mirror technology development program, explain how the technology was demonstrated to be TRL-6 (including the importance of an Engineering Development Unit), and list some of the author's personal lessons learned.

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Section: Mirror Technology Developmentmentioning

confidence: 99%

“…2). 20 – 23 A key element of the BATC approach is that the mirrors required cryo-null polishing to remove cool down cryodistortions.…”

Section: Mirror Technology Developmentmentioning

confidence: 99%

Webb Space Telescope primary mirror development: summary and lessons learned

Stahl

2024

J. Astron. Telesc. Instrum. Syst.

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“…However, many lightweight mirrors are now designed using a rib-stiffening concept [4]. As shown in Figure 3, a ribstiffened mirror is formed from a triangular pattern of stiff ribs which support a thin facesheet.…”

Section: Rib-stiffened Mirror Modelmentioning

confidence: 99%

Primary mirror shape control for athermalization using embedded sensors

Jordan¹,

Miller²

2007

SPIE Proceedings

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The next generation of space telescopes will be required to meet very challenging science goals. In order to achieve these goals, the size of the primary mirror will need to be increased. However, since current telescopes are reaching their limits in terms of size and mass, new designs will require advanced technologies such as lightweight mirrors and active optical control. Traditional shape control of the primary mirror relies on feedback from a wavefront sensor located in the optical path. However, a wavefront sensor reduces the amount of light available for image formation. Therefore, to view very dim objects, it will be necessary to use a different type of sensor. In this work, a quasi-static shape control algorithm is developed to correct errors in the mirror due to thermal disturbances using only sensors embedded in the mirror. Control algorithms are presented for both embedded strain gages and temperature sensors. Finite element models of both a simple flat plate mirror and a rib-stiffened mirror are generated and analyzed using Nastran. The flat plate model, with surface-parallel actuation is used to compare the two algorithms. Following this, the parametric model for a rib-stiffened mirror is used to analyze the effects of the shape control algorithm as the mirror geometry is changed. It is shown that correction of a mirror can be achieved using these embedded sensors.

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“…The 1.4-m point-to-point AMSD mirror 5,6,7 demonstrates one component of a segmented primary mirror approach. The James Webb Space Telescope (JWST) will be composed of an array of 18 AMSD-like mirrors (each 1.6-m point-to-point).…”

Section: Introductionmentioning

confidence: 99%

Optical characterization of the beryllium semi-rigid AMSD mirror assembly

Kendrick¹,

Chaney²,

Brown³

2004

SPIE Proceedings

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The 1.4-m semi-rigid, beryllium 1 Advanced Mirror System Demonstrator (AMSD) mirror has been lightweighted by over 90% (achieving 10 kg/m 2 areal density) and optically ground and polished. The mounting structures have been completed and key attachments integrated prior to final polishing. The displacement actuators have been fabricated and tested at ambient and cryogenic temperatures. The integrated assembly represents an off-axis, aspheric, flight panel of a spaceborne mirror array whose radius of curvature (RoC) can be matched with its companion segments and whose position can be separately phased in a rigid body fashion.The results of the initial ambient testing and the cryogenic test set-up of the mirror assembly will be presented including mirror surface characterization and the correction afforded by radius of curvature actuation. Cryogenic testing at MSFC was completed in August 2003. The lightweighted, semi-rigid mirror architecture approach demonstrated here is a precursor to the mirror technology being applied to the James Webb Space Telescope (JWST).

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<title>In-process status of the 1.4-m beryllium semi-rigid Advanced Mirror System Demonstrator (AMSD)</title>

Cited by 5 publications

References 0 publications

Webb Space Telescope primary mirror development: summary and lessons learned

Webb Space Telescope primary mirror development: summary and lessons learned

Primary mirror shape control for athermalization using embedded sensors

Optical characterization of the beryllium semi-rigid AMSD mirror assembly

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