Cryogenic optical test planning using the Optical Telescope Element Simulator with the James Webb Space Telescope Integrated Science Instrument Module

Timothy A. Reichard; Nicholas A. Bond; Bradford W. Greeley; Eliot M. Malumuth; Marcio Melendez; Ron Shiri; Catarina Alves de Oliveira; Scott R. Antonille; Stephan Birkmann; Clinton Davis; William V. Dixon; André R. Martel; Cherie L. Miskey; Raymond G. Ohl IV; Derek Sabatke; Joseph Sullivan

doi:10.1117/12.2237006

27 September 2016 Cryogenic optical test planning using the Optical Telescope Element Simulator with the James Webb Space Telescope Integrated Science Instrument Module

Timothy A. Reichard, Nicholas A. Bond, Bradford W. Greeley, Eliot M. Malumuth, Marcio Melendez, Ron Shiri, Catarina Alves de Oliveira, Scott R. Antonille, Stephan Birkmann, Clinton Davis, William V. Dixon, André R. Martel, Cherie L. Miskey, Raymond G. Ohl IV, Derek Sabatke, Joseph Sullivan

Author Affiliations +

Proceedings Volume 9951, Optical System Alignment, Tolerancing, and Verification X; 99510N (2016) https://doi.org/10.1117/12.2237006
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

NASA’s James Webb Space Telescope (JWST) is a 6.5 m diameter, segmented, deployable telescope for cryogenic infrared space astronomy (~40 K). The JWST Observatory architecture includes the Optical Telescope Element (OTE) and the Integrated Science Instrument Module (ISIM) element that contains four science instruments (SIs), including a guider. The SI and guider units are integrated to the ISIM structure and optically tested at NASA Goddard Space Flight Center as an instrument suite using a telescope simulator (Optical Telescope Element SIMulator; OSIM). OSIM is a high-fidelity, cryogenic JWST telescope simulator that features a ~1.5m diameter powered mirror. The SIs are aligned to the flight structure’s coordinate system under ambient, clean room conditions using optomechanical metrology and customized interfaces. OSIM is aligned to the ISIM mechanical coordinate system at the cryogenic operating temperature via internal mechanisms and feedback from alignment sensors and metrology in six degrees of freedom. SI performance, including focus, pupil shear, pupil roll, boresight, wavefront error, and image quality, is evaluated at the operating temperature using OSIM. The comprehensive optical test plans include drafting OSIM source configurations for thousands of exposures ahead of the start of a cryogenic test campaign. We describe how we predicted the performance of OSIM light sources illuminating the ISIM detectors to aide in drafting these optical tests before a test campaign began. We also discuss the actual challenges and successes of those exposure predictions encountered during a test campaign to fulfill the demands of the ISIM optical performance verification.

Citation Download Citation

Timothy A. Reichard, Nicholas A. Bond, Bradford W. Greeley, Eliot M. Malumuth, Marcio Melendez, Ron Shiri, Catarina Alves de Oliveira, Scott R. Antonille, Stephan Birkmann, Clinton Davis, William V. Dixon, André R. Martel, Cherie L. Miskey, Raymond G. Ohl IV, Derek Sabatke, and Joseph Sullivan "Cryogenic optical test planning using the Optical Telescope Element Simulator with the James Webb Space Telescope Integrated Science Instrument Module", Proc. SPIE 9951, Optical System Alignment, Tolerancing, and Verification X, 99510N (27 September 2016); https://doi.org/10.1117/12.2237006

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available