Cryogenic design and predicted performance of the James Webb space telescope beryllium aft optics subsystem optical bench

K. Martinez; J. Sullivan; A. Barto; J. Lewis; R. Franck; T. Dreher; B. Shogrin; J. Sokol; W. Tandy Jr.

doi:10.1117/12.738609

17 September 2007 Cryogenic design and predicted performance of the James Webb space telescope beryllium aft optics subsystem optical bench

K. Martinez, J. Sullivan, A. Barto, J. Lewis, R. Franck, T. Dreher, B. Shogrin, J. Sokol, W. Tandy Jr.

Author Affiliations +

Proceedings Volume 6666, Optical Materials and Structures Technologies III; 66660S (2007) https://doi.org/10.1117/12.738609
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

With a planned launch of 2013, NASA's James Webb Space Telescope (JWST) will be the premier space observatory for astronomers worldwide. This infrared space telescope will be passively cooled to cryogenic temperatures in its solar L2 orbit. The JWST Optical Telescope Element (OTE) features a 6.5 meter, segmented Primary Mirror, which focuses light onto a Secondary Mirror and finally redirected into and through the Aft Optics Subsystem (AOS). The AOS consists of an optical bench which aligns and supports the telescope's Tertiary Mirror and Fine Steering Mirror Assemblies. This paper describes the unique cryogenic requirements and design of the JWST Beryllium AOS optical bench. Key performance requirements are reviewed including: launch environment, the cryogenic operating environment (nominally 39K), and optical alignment stability at cryogenic temperatures. The mechanical design approach utilizing Beryllium as the structural material for the AOS Bench is described relative to meeting the driving requirements. Material property verification, low and predictable material variability, and low thermal gradients across the structure are also discussed.

Citation Download Citation

K. Martinez, J. Sullivan, A. Barto, J. Lewis, R. Franck, T. Dreher, B. Shogrin, J. Sokol, and W. Tandy Jr. "Cryogenic design and predicted performance of the James Webb space telescope beryllium aft optics subsystem optical bench", Proc. SPIE 6666, Optical Materials and Structures Technologies III, 66660S (17 September 2007); https://doi.org/10.1117/12.738609

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