Integrated telescope model for the James Webb Space Telescope

Knight, J. Scott; Acton, D. Scott; Lightsey, Paul A.; Barto, Allison

doi:10.1117/12.926814

Cited by 15 publications

(16 citation statements)

References 8 publications

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“…The wavefront sensing and control technologies chosen for JWST have been proven by a long-term technology development plan of simulations and laboratory demonstrations, 6 in particular using the Testbed Telescope (TBT) at Ball Aerospace, 7, 8 a 1:6 scale mockup of JWST with flight-like segmentation and actuation, and the Integrated Telescope Model (ITM) software. 9 However, new and improved algorithms for wavefront sensing and control continue to be developed, [10][11][12][13] and a flexible general-purpose lab testbed will contribute to evaluating such algorithms for possible application to JWST or to future missions such as WFIRST/AFTA. Furthermore, there is a continued need to practice scenarios and develop staff expertise for JWST commissioning and operations, including in the longer run a need for occasionally training new staff in phase retrieval techniques throughout the five-to-ten year mission of JWST.…”

Section: Introductionmentioning

confidence: 99%

James Webb Space Telescope Optical Simulation Testbed I: overview and first results

Perrin¹,

Soummer²,

Choquet³

et al. 2014

SPIE Proceedings

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The James Webb Space Telescope (JWST) Optical Simulation Testbed (JOST) is a tabletop workbench to study aspects of wavefront sensing and control for a segmented space telescope, including both commissioning and maintenance activities. JOST is complementary to existing optomechanical testbeds for JWST (e.g. the Ball Aerospace Testbed Telescope, TBT) given its compact scale and flexibility, ease of use, and colocation at the JWST Science & Operations Center. We have developed an optical design that reproduces the physics of JWST's three-mirror anastigmat using three aspheric lenses; it provides similar image quality as JWST (80% Strehl ratio) over a field equivalent to a NIRCam module, but at HeNe wavelength. A segmented deformable mirror stands in for the segmented primary mirror and allows control of the 18 segments in piston, tip, and tilt, while the secondary can be controlled in tip, tilt and x, y, z position. This will be sufficient to model many commissioning activities, to investigate field dependence and multiple field point sensing & control, to evaluate alternate sensing algorithms, and develop contingency plans. Testbed data will also be usable for cross-checking of the WFS&C Software Subsystem, and for staff training and development during JWST's five-to ten-year mission.

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Section: Introductionmentioning

confidence: 99%

James Webb Space Telescope Optical Simulation Testbed I: overview and first results

Perrin¹,

Soummer²,

Choquet³

et al. 2014

SPIE Proceedings

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“…The Integrated Telescope Model (ITM) is used by the Ball Aerospace & Technologies Corp. (BATC) to support the development of the JWST wavefront control system and on-orbit commissioning as a virtual observatory [3]. The ITM seamlessly integrates optics, structural dynamics, controls and disturbances into a Simulink Matlab-based environment.…”

Section: The Integrated Telescope Modelmentioning

confidence: 99%

Multi-field alignment of the James Webb Space Telescope

Acton¹,

Knight²

2012

Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave

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When the secondary mirror (SM) of a Three-Mirror Anastigmat (TMA) telescope is misaligned with respect to the primary mirror (PM), optical wavefront errors are created. In general, the errors take the form of a dominant coma term, common to all field points, in addition to astigmatism and power terms which vary with field position. The magnitude of the field dependent wavefront is usually only a few percent of that of the common coma term, depending on the size of the field of view being considered. The architecture of the James Webb Space Telescope (JWST), however, presents a unique optical problem in that the common term created by misplacement of the SM is compensated by adjustment of the PM segments. As such, the residual field dependent terms become dominant and can be sensed at multiple field points using phase retrieval techniques. In this paper, we present a linear set of equations that describe the multi-field (MF) wavefront errors resulting from a misaligned SM. It is shown that inverting these equations yields corrections for the SM alignment that can independently control the field-dependent astigmatism and the focal-plane tilt. Computer simulations illustrating the correction are presented.

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“…Miller et al [26] proposed a comprehensive framework for integrated modeling known as the disturbances optics controls structures, which was used in the Terrestrial Planet Finder mission [27] and the Space Interferometry Mission [28]. Some analogous research has been done, such as the integrated technology model [29] and the structural-thermal-optical [30]. However, the aforementioned integrated optomechanical analysis methods are complicated and require an amount of data exchange among different software.…”

Section: Introductionmentioning

confidence: 98%

Design of a Vibration Isolation System for the Space Telescope

Yang

et al. 2015

Journal of Guidance, Control, and Dynamics

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Integrated telescope model for the James Webb Space Telescope

Cited by 15 publications

References 8 publications

James Webb Space Telescope Optical Simulation Testbed I: overview and first results

James Webb Space Telescope Optical Simulation Testbed I: overview and first results

Multi-field alignment of the James Webb Space Telescope

Design of a Vibration Isolation System for the Space Telescope

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