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Optomechanical modeling of the optical telescope element and integrated science instrument module (OTIS) cryo-vacuum test for the James Webb Space Telescope (JWST)

This paper describes the construction and application of an integrated optomechanical raytrace model used for optical analysis support of the OTIS cryo-vacuum test of the James Webb Space Telescope (JWST) test campaign. OTIS is the Optical Telescope Element (OTE) and Integrated Science Instrument Module (ISIM). Four specific applications are described – 1) simulation of ambient over-lighting conditions from clean room luminaires and photogrammetry flashes, 2) PSF image motion predictions in the presence of auto-collimating flat (ACF) actuation, 3) science instrument field illumination (“shadowgrams”) checking for unexpected vignetting, and 4) pupil alignment simulations of the Near Infrared Imager and Slitless Spectrograph (NIRISS).