Share Email Print

Proceedings Paper

Technology for 8-m primary mirrors
Author(s): Richard G. Bingham; David D. Walker; Francisco Diego
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

The cost of an 8-m telescope is still too high for most national observatories. Cost reductions must involve new technology for the primary mirror: its material and figuring, its mass, handling and the aluminizing plant. The present scheme addresses these problems using some features of the Keck technology, but is simplified. Consideration is given to a segmented mirror in which the segments are radially cut sectors. The sectors for an 8-m aperture will fit inside a 4-m aluminizing plant (which already exists on some sites, and in any event is cheaper than an 8-m plant). Zero-expansion material (glass-ceramic or fused silica) may be used. The model thickness is about 10 cm. The proposed method of production is to figure the whole set assembled as a single mirror. No cutting takes place after figuring.

Paper Details

Date Published: 1 July 1990
PDF: 11 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990);
Show Author Affiliations
Richard G. Bingham, Royal Greenwich Observatory and Univ. College London (United Kingdom)
David D. Walker, Univ. College London (United Kingdom)
Francisco Diego, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?