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Proceedings Paper

Scattered light characterization of FORTIS
Author(s): Stephan R. McCandliss; Anna Carter; Keith Redwine; Stephane Teste; Russell Pelton; John Hagopian; Alexander Kutyrev; Mary J. Li; S. Harvey Moseley
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Paper Abstract

We describe our efforts to build a Wide-Field Lyman alpha Geocoronal simulator (WFLaGs) for characterizing the end-to-end sensitivity of FORTIS (Far-UV Off Rowland-circle Telescope for Imaging and Spectroscopy) to scattered Lyman α emission from outside of the nominal (1/2 degree)2 field-of-view. WFLaGs is a 50 mm diameter F/1 aluminum parabolic collimator fed by a hollow cathode discharge lamp with a 80 mm clear MgF2 window housed in a vacuum skin. It creates emission over a 10 degree FOV. WFLaGS will allow us to validate and refine a recently developed scattered light model and verify our scatter light mitigation strategies, which will incorporate low scatter baffle materials, and possibly 3-d printed light traps, covering exposed scatter centers. We present measurements of scattering intensity of Lyman alpha as a function of angle with respect to the specular reflectance direction for several candidate baffle materials. Initial testing of WFLaGs will be described.

Paper Details

Date Published: 29 August 2017
PDF: 9 pages
Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 1039718 (29 August 2017); doi: 10.1117/12.2274282
Show Author Affiliations
Stephan R. McCandliss, Johns Hopkins Univ. (United States)
Anna Carter, Johns Hopkins Univ. (United States)
Keith Redwine, Johns Hopkins Univ. (United States)
Stephane Teste, Johns Hopkins Univ. (United States)
Russell Pelton, Johns Hopkins Univ. (United States)
John Hagopian, NASA Goddard Space Flight Ctr. (United States)
Alexander Kutyrev, NASA Goddard Space Flight Ctr. (United States)
Mary J. Li, NASA Goddard Space Flight Ctr. (United States)
S. Harvey Moseley, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 10397:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX
Oswald H. Siegmund, Editor(s)

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