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 0.9 mu m<1.7 mu m for similar to 200 million galaxies at z<2 and H<22 over 20,000 deg(2). 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.

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

ROSATI, Piero;
2008

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 0.9 mu m<1.7 mu m for similar to 200 million galaxies at z<2 and H<22 over 20,000 deg(2). 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.
2008
9780819472205
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1854018
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