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Proceedings Paper

Primary mirror blank fabrication of SUBARU Telescope
Author(s): Aki Sasaki; Izumi Mikami; Noriko Shimoyama; Ken-Ichi Nishiguchi; William R. Powell; Mary J. Edwards; Hiroyasu Ando; Masanori Iye
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Paper Abstract

The Japan National Large Telescope (SUBARU) under construction adopted Corning ULE glass for its primary mirror, which is made from 44 hexagonal blank segments (hexes) sealed together. The optimized hexes placement pattern was determined using the simulated annealing method so as to minimize the thermal deformation due to the inhomogeneity of the coefficient of thermal expansion of the hexes. The sealing process has been successfully completed and now the flat-to-flat blank is under the grinding phase to be followed by the sag-down phase for meniscus forming. The present paper summarizes the hexes placement pattern optimization method and various analysis behind its actual application, including current status of the fabrication.

Paper Details

Date Published: 1 June 1994
PDF: 8 pages
Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); doi: 10.1117/12.176185
Show Author Affiliations
Aki Sasaki, Mitsubishi Communication Equipment Works (Japan)
Izumi Mikami, Mitsubishi Communication Equipment Works (Japan)
Noriko Shimoyama, Mitsubishi Communication Equipment Works (Japan)
Ken-Ichi Nishiguchi, Mitsubishi Communication Equipment Works (Japan)
William R. Powell, Corning Incorporated (United States)
Mary J. Edwards, Corning Incorporated (United States)
Hiroyasu Ando, National Astronomical Observatory (Japan)
Masanori Iye, National Astronomical Observatory (Japan)


Published in SPIE Proceedings Vol. 2199:
Advanced Technology Optical Telescopes V
Larry M. Stepp, Editor(s)

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