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Proceedings Paper

The Dark Energy Spectroscopic Instrument (DESI) instrument mechanism control systems
Author(s): Carl T. Coker; Daniel Pappalardo; Richard Pogge; Paul Martini; Mark Derwent; Thomas P. O'Brien; Klaus Honscheid
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Paper Abstract

The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 40 million galaxies over 14,000 sq deg will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5,000 fiber optic positioners. The fibers in turn feed ten broad-band spectrographs. We present the design details of the instrument mechanism control systems for the spectrographs. Each spectrograph has a stand-alone mechanism control box that operates the unit's four remotely-operated mechanisms (two shutters and two Hartmannn doors), and provides a suite of temperature and humidity sensors. Each control box is highly modular, and is operated by a dedicated on-board Linux computer to provide all of the control and monitoring functions. We describe our solution for integrating a number of network-connected devices within each unit spectrograph, and describe the basic software architecture.

Paper Details

Date Published: 9 August 2016
PDF: 8 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99087P (9 August 2016); doi: 10.1117/12.2231117
Show Author Affiliations
Carl T. Coker, The Ohio State Univ. (United States)
Daniel Pappalardo, The Ohio State Univ. (United States)
Richard Pogge, The Ohio State Univ. (United States)
Paul Martini, The Ohio State Univ. (United States)
Mark Derwent, The Ohio State Univ. (United States)
Thomas P. O'Brien, The Ohio State Univ. (United States)
Klaus Honscheid, The Ohio State Univ. (United States)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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