Offspring of SPACE: the spectrograph channel of the ESA Dark Energy Mission EUCLID

Content, R.; Cimatti, A.; Robberto, M.; Grange, R.; Spanò, P.; Sharples, R.M.; Baugh, C.; Garilli, B.; Guzzo, L.; Le Fevre, O.; Maccagni, D.; Rosati, P.; Wang, Y.; Zamorani, G.; Zerbi, F.

Abstract

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.

• Presentation Conference Type: Conference Paper (Published)
• Conference Name: Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
• Publication Date: 2008-08
• Deposit Date: Jan 31, 2012
• Publisher: SPIE
• Volume: 7010
• Series Title: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
• Series ISSN: 0277-786X
• Book Title: Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter:; Marseille, France | June 23, 2008
• ISBN: 9780819472212
• DOI: https://doi.org/10.1117/12.805409
• Public URL: https://durham-repository.worktribe.com/output/1157211