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Proceedings Paper

JWST science instrument pupil alignment measurements
Author(s): Dave Kubalak; Joe Sullivan; Ray Ohl; Scott Antonille; Alexander Beaton; Phillip Coulter; George Hartig; Doug Kelly; David Lee; Michael Maszkiewicz; Paul Schweiger; Randal Telfer; Maurice Te Plate; Martyn Wells
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Paper Abstract

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.

Paper Details

Date Published: 27 September 2016
PDF: 13 pages
Proc. SPIE 9951, Optical System Alignment, Tolerancing, and Verification X, 99510D (27 September 2016); doi: 10.1117/12.2238830
Show Author Affiliations
Dave Kubalak, NASA Goddard Space Flight Ctr. (United States)
Joe Sullivan, Ball Aerospace & Technologies Corp. (United States)
Ray Ohl, NASA Goddard Space Flight Ctr. (United States)
Scott Antonille, NASA Goddard Space Flight Ctr. (United States)
Alexander Beaton, COM DEV International Ltd. (Canada)
Phillip Coulter, NASA Goddard Space Flight Ctr. (United States)
George Hartig, Space Telescope Science Institute (United States)
Doug Kelly, The Univ. of Arizona (United States)
David Lee, UK Astronomy Technology Ctr. (United Kingdom)
Michael Maszkiewicz, Canadian Space Agency (Canada)
Paul Schweiger, Lockheed Martin Space Systems Co. (United States)
Randal Telfer, Space Telescope Science Institute (United States)
Maurice Te Plate, European Space Agency (Netherlands)
Martyn Wells, UK Astronomy Technology Ctr. (United Kingdom)


Published in SPIE Proceedings Vol. 9951:
Optical System Alignment, Tolerancing, and Verification X
José Sasián; Richard N. Youngworth, Editor(s)

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