JWST science instrument pupil alignment measurements

• Main Authors: Kubalak, Dave, Sullivan, Joe, Ohl, Ray, Antonille, Scott, Beaton, Alexander, Coulter, Phillip, Hartig, George, Kelly, Doug, Lee, David, Maszkiewicz, Michael, Schweiger, Paul, Telfer, Randal, Te Plate, Maurice, Wells, Martyn
• Other Authors: Univ Arizona
• Language: en
• Published: SPIE-INT SOC OPTICAL ENGINEERING 2016
• Subjects: JWST; ISIM; pupil alignment; pupil; pupil shear; testing; verification
• Online Access: 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 and Martyn Wells " JWST science instrument pupil alignment measurements ", Proc. SPIE 9951, Optical System Alignment, Tolerancing, and Verification X, 99510D (September 27, 2016); doi:10.1117/12.2238830; http://dx.doi.org/10.1117/12.2238830; http://hdl.handle.net/10150/622534; http://arizona.openrepository.com/arizona/handle/10150/622534

NASA's James Webb Space Telescope (JWST) is a 6.5m diameter, segmented, deployable telescope for cryogenic IR space astronomy (similar to 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.