9 August 2016 The Dark Energy Spectroscopic Instrument (DESI) instrument mechanism control systems
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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.
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Carl T. Coker, Daniel Pappalardo, Richard Pogge, Paul Martini, Mark Derwent, Thomas P. O'Brien, Klaus Honscheid, "The Dark Energy Spectroscopic Instrument (DESI) instrument mechanism control systems", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99087P (9 August 2016); doi: 10.1117/12.2231117; https://doi.org/10.1117/12.2231117


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