24 July 2014 Multi object spectrograph of the Fireball balloon experiment
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Abstract
Fireball is a NASA/CNES balloon-borne experiment to study the faint diffuse circumgalactic emission in the ultraviolet around 200 nm. The field of view of the 1 meter diameter parabola is enlarged using a two-mirror field corrector providing 1000 arcmin2 at the slit mask. The 0.1 nm resolution Multi Object Spectrograph is based on two identical Schmidt systems sharing a reflective aspherical grating. The aspherization of the grating is achieved using a double replication technique of a metallic deformable matrix. We will present the F/2.5 spectrograph design and the deformable matrix process to obtain the Schmidt grating with elliptical contours.
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R. Grange, R. Grange, G. R. Lemaitre, G. R. Lemaitre, S. Quiret, S. Quiret, B. Milliard, B. Milliard, S. Pascal, S. Pascal, A. Origné, A. Origné, "Multi object spectrograph of the Fireball balloon experiment", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 914430 (24 July 2014); doi: 10.1117/12.2056388; https://doi.org/10.1117/12.2056388
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