4 August 2014 From space to specs: requirements for 4MOST
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4MOST,1 the 4m Multi-Object spectrographic Survey Telescope, is an upcoming optical, fiber-fed, MOS facility for the VISTA telescope at ESO's Cero Paranal Observatory (Chile). The preliminary design of 4MOST features 2,400 fibers split into a low-resolution (1,600 fibers, 390-900 nm, R > 5; 000) and a high-resolution channel (800 fibers, three arms, ~20-25 nm coverage each, R > 18; 000) with an Echidna-style positioner, and covering a hexagonal field of view of ~4.1 sqdeg. 4MOST's main science goals encompass massive (tens of millions of spectra), all-Southern sky (> 18; 000 sqdeg) surveys following up both the Gaia (optical) and eROSITA (X-ray) space missions, plus cosmological science that complements missions such as e.g. Euclid. In a novel approach, observations of these science cases, which are very different from another, are to be carried out in parallel (i.e., simultaneously); thus, from the very different science requirements, key user requirements have to be identified, stringently formulated, and condensed into a coherent set of system specifications. Clearly, identifying common grounds and thereby significantly reducing complexity in both the formulated requirements and the final 4MOST facility, is a very challenging task. In this paper, we will present science and user requirements, and how the latter flow down from the former, and eventually further down to the system-specification level. Special emphasis will be put on the identification of key requirements and their validation and verification protocols, so that significant trade-offs can be done as early on in the design phase as possible, with as little impact as possible on the science capabilities upstream.
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Olivier Schnurr, Olivier Schnurr, C. Jakob Walcher, C. Jakob Walcher, Cristina Chiappini, Cristina Chiappini, Axel D. Schwope, Axel D. Schwope, Olga Bellido-Tirado, Olga Bellido-Tirado, Roger Haynes, Roger Haynes, Sofia Feltzing, Sofia Feltzing, Richard McMahon, Richard McMahon, Roelof S. de Jong, Roelof S. de Jong, Wolfgang Ansorge, Wolfgang Ansorge, } "From space to specs: requirements for 4MOST", Proc. SPIE 9150, Modeling, Systems Engineering, and Project Management for Astronomy VI, 91501C (4 August 2014); doi: 10.1117/12.2056466; https://doi.org/10.1117/12.2056466


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