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17 November 2017 Design and functional tests of the Euclid grism mount
Ch. Rossin, R. Grange, A. Caillat, A. Costille, P. Sanchez, W. Ceria
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Proceedings Volume 10563, International Conference on Space Optics — ICSO 2014; 105634W (2017) https://doi.org/10.1117/12.2304070
Event: International Conference on Space Optics — ICSO 2014, 2014, Tenerife, Canary Islands, Spain
Abstract
The Euclid mission selected by ESA in the Cosmic Vision program is dedicated to understand dark energy and dark matter. One of the probes based on detection of Baryonic Acoustic Oscillations required the redshift of millions of galaxies. This massive spectroscopic survey relies on the Near Infrared SpectroPhotometer (NISP) using grism in slitless mode. In this Euclid NISP context, we designed a cryogenic mount for the four grisms of the spectroscopic channel. This mount has to maintain optical performances and alignment at the cryogenic temperature of 120K and to survive launch vibrations. Due to a very small mass and volume budget allowed in the Grism Wheel Assembly our design relies on a weight relief Invar ring glued to the grism by tangential flexures. Tangential flexures have the advantage of small height but the drawback of less decoupling capabilities than bipods. We will present the design of the mount and the integration and functional tests to stay within the 60 nm RMS transmitted wavefront error budget allowed to the grism.
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Ch. Rossin, R. Grange, A. Caillat, A. Costille, P. Sanchez, and W. Ceria "Design and functional tests of the Euclid grism mount", Proc. SPIE 10563, International Conference on Space Optics — ICSO 2014, 105634W (17 November 2017); https://doi.org/10.1117/12.2304070
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KEYWORDS
Prisms
Finite element methods
Sensors
Interfaces
Spherical lenses
Astronomical imaging
Silica
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