Status of Wavefront Sensing and Control of the James Webb Space Telescope

Details Status of Wavefront Sensing and Control of the James Webb Space Telescope Status of Wavefront Sensing and Control of the James Webb Space Telescope

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921003b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #210.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

The telescope of the James Webb Space Telescope (JWST) is an f/20, three mirror anastigmat design. It consists of a nominal 6.6 meter primary mirror composed of 18 individual, 1.3 meter hexagonal, Beryllium segments, a deployable, secondary mirror and support structure, and a tertiary mirror. During observatory commissioning, the telescope components must be deployed, aligned and co-phased to meet the basic requirement of 0.8 Strehl at 2 microns. To accomplish this, each primary mirror segment is mounted on an actuated hexapod structure providing six degrees of freedom for positioning and an additional radius-of-curvature control, and the secondary is also mounted on a six degree-of-freedom hexapod. A process of wavefront sensing and control (WFS&C) has been designed to progressively adjust the telescope components through a series of steps including segment identification, secondary alignment, coarse phasing and finally, fine phasing. We review the WFS&C process and present the results of some recent laboratory tests using high fidelity simulators to confirm and refine this process.

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