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Opto-mechanical design of SCUBA-2

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Author: Atad-Ettedgui, E. · Peacocke, T. · Montgomery, D. · Gostick, D. · McGregor, H. · Cliff, M. · Saunders, I. · Ploeg, L. · Dorrepaal, M. · Venrooij, B. van
Type:article
Date:2006
Publisher: SPIE
Institution: TNO Industrie en Techniek
Source:Optomechanical Technologies for Astronomy, 24-31 May 2006, Orlando, FL, USA, 6273 II
series:
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 239544
ISBN: 9780819463388
Article number: 62732H
Keywords: Aluminum mirrors · Cryogenics · Diamond turning · Freeform · Mechanical design · Optical design · SCUBA-2 · Constraint theory · Detectors · Optical fiber fabrication · Optical filters · Optical telescopes

Abstract

This paper describes the opto-mechanical design of a large instrument for sub-nun, SCUBA-2, to be commissioned at JCMT. The scientific requirements, specially the large fov and the constraints of the telescope mechanical structure, lead to a complex optical design using freeform aluminium minors. The mechanical design is also challenging with large modules to be mounted and aligned in the telescope as well as the cryogenic instrument containing the minors, the filters, the dichroics and the detector modules. The cryogenic isostatic mounting, the structural and thermal designs are presented. This includes details of the fabrication of the structure and design of a shutter mechanism for operation at 4K. The results of the first AIV cool-down are also presented.