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6 July 2018 Blazed transmission grating technology development for the Arcus x-ray spectrometer explorer
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Abstract
Arcus is a high-resolution soft x-ray spectroscopy mid-size Explorer mission selected for a NASA Phase A concept study. It is designed to explore structure formation through measurements of hot baryon distributions, feedback from black holes, and the formation and evolution of stars, disks, and exoplanet atmospheres. The design provides unprecedented sensitivity in the 1.2-5 nm wavelength band with effective area up to 350 cm2 and spectral resolving power R > 2500. The Arcus technology is based on a highly modular design that features 12 m-focal length silicon pore optics (SPO) developed for the European Athena mission, and critical-angle transmission (CAT) x-ray diffraction gratings and x-ray CCDs developed at MIT. CAT gratings are blazed transmission gratings that have been under technology development for over ten years. We describe technology demonstrations of increasing complexity, including mounting of gratings to frames, alignment, environmental testing, integration into arrays, and performance under x-ray illumination with SPOs, using methods proposed for the manufacture of the Arcus spectrometers. CAT gratings have demonstrated efficiency > 30%. Measurements of the 14th order Mg-Kα1,2 doublet from a co-aligned array of four CAT gratings illuminated by two co-aligned SPOs matches ray trace predictions and exceeds Arcus resolving power requirements. More than 700 CAT gratings will be produced using high-volume semiconductor industry tools and special techniques developed at MIT
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ralf K. Heilmann, Alexander R. Bruccoleri, Jungki Song, Casey DeRoo, Peter Cheimetz, Edward Hertz, Randall K. Smith, Vadim Burwitz, Gisela Hartner, Marlis-Madeleine La Caria, Carlo Pelliciari, Hans M. Guenther, Sarah N. T. Heine, Beverly LaMarr, Herman L. Marshall, Norbert S. Schulz, Eric M. Gullikson, and Mark L. Schattenburg "Blazed transmission grating technology development for the Arcus x-ray spectrometer explorer", Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106996D (6 July 2018); https://doi.org/10.1117/12.2314180
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