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Proceedings Paper

Fireball multi object spectrograph: as-built optic performances
Author(s): R. Grange; B. Milliard; G. Lemaitre; S. Quiret; S. Pascal; A. Origné; E. Hamden; D. Schiminovich
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Paper 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.

Paper Details

Date Published: 18 July 2016
PDF: 6 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 990531 (18 July 2016); doi: 10.1117/12.2233267
Show Author Affiliations
R. Grange, Lab. d'Astrophysique de Marseille (France)
B. Milliard, Lab. d'Astrophysique de Marseille (France)
G. Lemaitre, Lab. d'Astrophysique de Marseille (France)
S. Quiret, Lab. d'Astrophysique de Marseille (France)
S. Pascal, Lab. d'Astrophysique de Marseille (France)
A. Origné, Lab. d'Astrophysique de Marseille (France)
E. Hamden, California Institute of Technology (United States)
D. Schiminovich, Columbia Univ. (United States)

Published in SPIE Proceedings Vol. 9905:
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Tadayuki Takahashi; Marshall Bautz, Editor(s)

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