27 September 2016 JWST science instrument pupil alignment measurements
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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.
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Dave Kubalak, Dave Kubalak, Joe Sullivan, Joe Sullivan, Ray Ohl, Ray Ohl, Scott Antonille, Scott Antonille, Alexander Beaton, Alexander Beaton, Phillip Coulter, Phillip Coulter, George Hartig, George Hartig, Doug Kelly, Doug Kelly, David Lee, David Lee, Michael Maszkiewicz, Michael Maszkiewicz, Paul Schweiger, Paul Schweiger, Randal Telfer, Randal Telfer, Maurice Te Plate, Maurice Te Plate, Martyn Wells, Martyn Wells, } "JWST science instrument pupil alignment measurements", Proc. SPIE 9951, Optical System Alignment, Tolerancing, and Verification X, 99510D (27 September 2016); doi: 10.1117/12.2238830; https://doi.org/10.1117/12.2238830
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