From Event: SPIE Optical Engineering + Applications, 2017
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.
Stephan R. McCandliss, Anna Carter, Keith Redwine, Stephane Teste, Russell Pelton, John Hagopian, Alexander Kutyrev, Mary J. Li, and S. Harvey Moseley, "Scattered light characterization of FORTIS," Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 1039718 (Presented at SPIE Optical Engineering + Applications: August 08, 2017; Published: 29 August 2017); https://doi.org/10.1117/12.2274282.
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