18 July 2016 Fireball multi object spectrograph: as-built optic performances
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Abstract
Fireball (Faint Intergalactic Redshifted Emission Balloon) is a NASA/CNES balloon-borne experiment to study the faint diffuse circumgalactic medium from the line emissions in the ultraviolet (200 nm) above 37 km flight altitude. Fireball relies on a Multi Object Spectrograph (MOS) that takes full advantage of the new high QE, low noise 13 μm pixels UV EMCCD. The MOS is fed by a 1 meter diameter parabola with an extended field (1000 arcmin2) using a highly aspherized two mirror corrector. All the optical train is working at F/2.5 to maintain a high signal to noise ratio. The spectrograph (R~ 2200 and 1.5 arcsec FWHM) is based on two identical Schmidt systems acting as collimator and camera sharing a 2400 g/mm aspherized reflective Schmidt grating. This grating is manufactured from active optics methods by double replication technique of a metal deformable matrix whose active clear aperture is built-in to a rigid elliptical contour. The payload and gondola are presently under integration at LAM. We will present the alignment procedure and the as-built optic performances of the Fireball instrument.
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R. Grange, R. Grange, B. Milliard, B. Milliard, G. Lemaitre, G. Lemaitre, S. Quiret, S. Quiret, S. Pascal, S. Pascal, A. Origné, A. Origné, E. Hamden, E. Hamden, D. Schiminovich, D. Schiminovich, } "Fireball multi object spectrograph: as-built optic performances", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 990531 (18 July 2016); doi: 10.1117/12.2233267; https://doi.org/10.1117/12.2233267
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