JWST’s optical telescope simulator for verification of the Integrated Science Instrument Module

OSIM is a full field, cryogenic, optical simulator of the James Webb Space Telescope (JWST) Optical Telescope Element (OTE). It is the “Master Tool” for verifying the cryogenic alignment and optical performance of the JWST Integrated Science Instrument Module (ISIM) by providing simulated point source/star images individually or simultaneously to each of the four Science Instruments in ISIM. Additionally, each star image can be scanned in focus to support the evaluation of both image quality and best focus for each Science Instrument. OSIM has recently completed supporting the ISIM performance verification test campaign which spanned three separate cryogenic test campaigns over 3 years. In this paper, we describe the alignment to the JWST coordinate system at cryogenic temperatures, OSIM optical performance, repeatability, and its role in testing the cryogenic optical performance of the individual Science Instruments in addition to providing calibration data needed for flight operations.

[1]  Scott Rohrbach,et al.  Ray-tracing for coordinate knowledge in the JWST Integrated Science Instrument Module , 2014, Other Conferences.

[2]  Stephan M. Birkmann,et al.  Cryo-vacuum testing of the JWST Integrated Science Instrument Module , 2016, Astronomical Telescopes + Instrumentation.

[3]  Bente Eegholm,et al.  Cryogenic metrology for the James Webb Space Telescope Integrated Science Instrument Module alignment target fixtures using laser radar through a chamber window , 2010, Optical Engineering + Applications.

[4]  Stephen A. Smee,et al.  Cryogenic performance of a high precision photogrammetry system for verification of the James Webb Space Telescope Integrated Science Instrument Module and associated ground support equipment structural alignment requirements , 2010, Optical Engineering + Applications.

[5]  Catarina Alves de Oliveira,et al.  Cryogenic optical test planning using the Optical Telescope Element Simulator with the James Webb Space Telescope Integrated Science Instrument Module , 2016, Optical Engineering + Applications.

[6]  Douglas B. Leviton,et al.  Ultrahigh-resolution Cartesian absolute optical encoder , 2003, SPIE Optics + Photonics.

[7]  James R. Fienup,et al.  Wavefront-error performance characterization for the James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) science instruments , 2016, Astronomical Telescopes + Instrumentation.

[8]  Michael Maszkiewicz,et al.  JWST science instrument pupil alignment measurements , 2016, Optical Engineering + Applications.

[9]  Bradley J. Frey,et al.  The Optical Telescope Element Simulator for the James Webb Space Telescope , 2008, Astronomical Telescopes + Instrumentation.

[10]  Marcia J. Rieke,et al.  Optical testing and verification methods for the James Webb Space Telescope Integrated Science Instrument Module element , 2016, Optical Engineering + Applications.

[11]  Steve Mann,et al.  Manufacturing and integration status of the JWST OSIM optical simulator , 2010, Astronomical Telescopes + Instrumentation.