12 July 2008 Offspring of SPACE: the spectrograph channel of the ESA Dark Energy Mission EUCLID
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The SPACE and DUNE proposals for the ESA Cosmic Vision 2015-2025 have been pre-selected for a Dark Energy Mission. An assessment study was performed in the past few months resulting in a merged mission called EUCLID. The study led to a possible concept for the mission and the payload, paving the way for the industrial studies. SPACE has now become the EUCLID spectrograph channel (EUCLID-spectro). We will discuss its science and give a description of the different studied optical designs. EUCLID-spectro aims to produce the largest three-dimensional map of the Universe by taking near-IR spectra at R=400 and 0.9μm<λ<1.7μm for ~200 million galaxies at z<2 and H<22 over 20,000 deg2. It will measure the expansion history of the Universe and the growth rate of structure using Baryonic Acoustic Oscillations, redshift-space distortions and clusters of galaxies. It will distinguish true dark energy from a modification of Einstein's gravity. The original design had 4 channels each re-imaging with mirrors a sub-field from the Casgrain focus onto a Digital Micromirror Device (DMD). A prism spectrograph followed each array. This design was modified to adapt EUCLID-spectro to a DUNE-type telescope, to reduce the number of optics and spectrographs, and add an imaging capability. We studied grism spectrographs, especially for a slitless backup solution that have less optics but a smaller field; we also studied compact prism and lens spectrographs, telescope corrector combined with micromirror arrays at the Casgrain focus then eliminating the re-imaging, and TIR prisms over the arrays to help with packaging.
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Robert Content, Andrea Cimatti, Massimo Robberto, Robert Grange, Paolo Spanò, Ray M. Sharples, Carlton Baugh, Bianca Garilli, Luigi Guzzo, Olivier Le Fevre, Dario Maccagni, Piero Rosati, Yun Wang, Giovanni Zamorani, Filippo Zerbi, "Offspring of SPACE: the spectrograph channel of the ESA Dark Energy Mission EUCLID", Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 70104S (12 July 2008); doi: 10.1117/12.805409; https://doi.org/10.1117/12.805409


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