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Proceedings Paper

Design of the Far Ultraviolet Spectroscopic Explorer mirror assemblies
Author(s): Michael Joseph Kennedy; Scott D. Friedman; Robert H. Barkhouser; Jeffrey Hampton; Paul Nikulla
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Paper Abstract

The Far Ultraviolet Spectroscopic Explorer (FUSE), currently being fabricated and scheduled for a 1998 launch, is an astrophysics satellite designed to provide high spectral resolving power ((lambda) /(Delta) (lambda) equals 30,000) over the interval 910 - 1180 angstroms. It consists of four co- aligned, normal incidence mirrors that illuminate separate Rowland circle spectrograph channels equipped with holographic gratings and delay line microchannel plate detectors. The FUSE mirrors are rectangular, off-axis paraboloids with stringent reflectivity, imaging, lightweighting, and mechanical requirements. Two mirrors have Al + SiC coatings on Zerodur substrates, and the other two have Al + LiF coatings, also on Zerodur substrates. Important aspects of the optical and mechanical design are discussed, including the surface accuracy specifications at different spatial scales and the micropositioning actuators, which provide submicrometer focus and subarcsecond tip-and-tilt adjustment of the mirrors. Also discussed is the proposed design validation, including the predicted surface deformations induced in the mirrors when they are subjected to various gravitational and metrology mount conditions.

Paper Details

Date Published: 12 October 1996
PDF: 12 pages
Proc. SPIE 2807, Space Telescopes and Instruments IV, (12 October 1996); doi: 10.1117/12.255098
Show Author Affiliations
Michael Joseph Kennedy, Johns Hopkins Univ. (United States)
Scott D. Friedman, Johns Hopkins Univ. (United States)
Robert H. Barkhouser, Johns Hopkins Univ. (United States)
Jeffrey Hampton, Swales and Associates, Inc. (United States)
Paul Nikulla, Swales and Associates, Inc. (United States)

Published in SPIE Proceedings Vol. 2807:
Space Telescopes and Instruments IV
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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