Critical science instrument alignment of the James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM)

Rohrbach, Scott; Kubalak, David A.; Gracey, Renee; Sabatke, Derek; Howard, Joseph M.; Telfer, Randal; Zielinski, Thomas P.

doi:10.1117/12.2238825

Cited by 5 publications

(8 citation statements)

References 10 publications

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“…This paper focuses on one of those methods -using Pupil Alignment References (PAR's) in the Optical Telescope Element Simulator (OSIM), and in the pupil planes of each SI. This topic is also discussed by Maszkiewicz et al 3 and Rohrbach et al 4 .…”

Section: Introductionmentioning

confidence: 74%

“…In light of this, we have completed an analysis of the worst-case shear and roll alignment conditions for the various instrument modes with performance that depends on roll alignment. We find that the as-built alignment provides acceptable performance 4 . …”

Section: Discussionmentioning

confidence: 98%

“…NIRCam and NIRSpec were not present for the CV1RR test, so results for those two SI's begin with CV2. A more complete uncertainty estimate, including systematic factors, is provided by Rohrbach et al 4 .…”

Section: Discussionmentioning

confidence: 99%

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JWST science instrument pupil alignment measurements

Kubalak

Sullivan²,

Ohl

et al. 2016

SPIE Proceedings

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NASA's James Webb Space Telescope (JWST) is a 6.5m diameter, segmented, deployable telescope for cryogenic IR space astronomy (~40K). The JWST Observatory architecture includes the Optical Telescope Element (OTE) and the Integrated Science Instrument Module (ISIM) element that contains four science instruments (SI), including a guider. OSIM is a full field, cryogenic, optical simulator of the JWST OTE. It is the "Master Tool" for verifying the cryogenic alignment and optical performance of ISIM by providing simulated point source/star images to each of the four Science Instruments in ISIM. Included in OSIM is a Pupil Imaging Module (PIM) -a large format CCD used for measuring pupil alignment. Located at a virtual stop location within OSIM, the PIM records superimposed shadow images of pupil alignment reference (PAR) targets located in the OSIM and SI pupils.The OSIM Pupil Imaging Module was described by Brent Bos, et al, at SPIE in 2011 prior to ISIM testing. We have recently completed the third and final ISIM cryogenic performance verification test before ISIM was integrated with the OTE. In this paper, we describe PIM implementation, performance, and measurement results.

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Section: Introductionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 98%

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JWST science instrument pupil alignment measurements

Kubalak

Sullivan²,

Ohl

et al. 2016

SPIE Proceedings

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“…As an infrared observatory, Webb's performance is critically dependent on achieving a stable thermal environment with excellent control of stray light (i.e., anything that doesn't come from the science field of view). Taking full advantage of Webb's highresolution instrumentation also requires superb wavefront sensing and alignment to deliver excellent image quality from the optics to the science instruments [37,38]. Webb's giant sunshield is the observatory's first line of protection from the radiation of the Sun, Earth and Moon, as well as other stray light on the back side of the observatory.…”

Section: Thermal Background and Optical Performancementioning

confidence: 99%

Scientific discovery with the James Webb Space Telescope

Kalirai

2018

Contemporary Physics

127

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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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“…Instrument and OSIM PAR calibration data were then used to calculate actual pupil coordinates resulting in the onorbit shear values as in Table 3, including gravity release estimates. Ambient and cryo temperature ISIM pupil methodology and metrology is described in [10], [12], [13] and [14]. …”

Section: B Pupil Shear Error Contributorsmentioning

confidence: 99%