Fireball multi object spectrograph: as-built optic performances

R. Grange; B. Milliard; G. Lemaitre; S. Quiret; S. Pascal; A. Origné; E. Hamden; D. Schiminovich

doi:10.1117/12.2233267

18 July 2016 Fireball multi object spectrograph: as-built optic performances

R. Grange, B. Milliard, G. Lemaitre, S. Quiret, S. Pascal, A. Origné, E. Hamden, D. Schiminovich

Proceedings Volume 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray; 990531 (2016) https://doi.org/10.1117/12.2233267
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

Citation Download Citation

R. Grange, B. Milliard, G. Lemaitre, S. Quiret, S. Pascal, A. Origné, E. Hamden, and 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); https://doi.org/10.1117/12.2233267

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