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Proceedings Paper

Fabrication of narrow-slit masks for the Gemini Multiobject Spectrograph
Author(s): Kei Szeto; James R. Stilburn; Tim Bond; Scott C. Roberts; Jerry Sebesta; Leslie K. Saddlemyer
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Paper Abstract

The fabrication requirements of the Gemini multi-object spectrograph (GMOS) slit mask is discussed particularly in terms of the slit-to-slit position, slit geometry and the telescope operation. The demand for precision slit masks with high quality slits of width of less than quarter arcsecond and an allowable fabrication time of two hours required examination of innovative fabrication processes and mask materials. Different fabrication processes including high precision cutting processes, water-jet and laser machining systems are evaluated according to cost, speed and efficiency, and the findings are documented. Different candidate mask materials including low thermal expansion metals and novel materials such as graphite paper and carbon-fiber composite sheet, are evaluated according to their relevant mechanical and physical properties, and the findings are also documented. In addition to identifying that the most suitable mask material is unidirectional carbon fiber sheet and the corresponding fabrication process is a Nd:YAG laser machining system, the mask handling system for GMOS is described and methodology to minimize systematic fabrication errors is also proposed.

Paper Details

Date Published: 21 March 1997
PDF: 10 pages
Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); doi: 10.1117/12.269017
Show Author Affiliations
Kei Szeto, Dominion Astrophysical Observatory (Canada)
James R. Stilburn, Dominion Astrophysical Observatory (Canada)
Tim Bond, Dominion Astrophysical Observatory (Canada)
Scott C. Roberts, Dominion Astrophysical Observatory (Canada)
Jerry Sebesta, Dominion Astrophysical Observatory (Canada)
Leslie K. Saddlemyer, Dominion Astrophysical Observatory (Canada)

Published in SPIE Proceedings Vol. 2871:
Optical Telescopes of Today and Tomorrow
Arne L. Ardeberg, Editor(s)

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