Critical-angle transmission grating spectrometer for high-resolution soft x-ray spectroscopy on the International X-ray Observatory
Author(s)Davis, John E.; Dewey, Dan; Foster, Richard F.; Bruccoleri, Alexander Robert; Mukherjee, Pran; Robinson, David; Huenemoerder, David P.; Schattenburg, Mark Lee; Schulz, Norbert S.; Guo, L. Jay; Kaplan, Alex F.; Schweikart, Russell B.; Heilmann, Ralf K; Bautz, Marshall W.; Marshall, Herman; ... Show more Show less
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High-resolution spectroscopy at energies below 1 keV covers the lines of C, N, O, Ne and Fe ions, and is central to studies of the Interstellar Medium, the Warm Hot Intergalactic Medium, warm absorption and outflows in Active Galactic Nuclei, coronal emission from stars, etc. The large collecting area, long focal length, and 5 arcsecond half power diameter telescope point-spread function of the International X-ray Observatory will present unprecedented opportunity for a grating spectrometer to address these areas at the forefront of astronomy and astrophysics. We present the current status of a transmission grating spectrometer based on recently developed high-efficiency critical-angle transmission (CAT) gratings that combine the traditional advantages of blazed reflection and transmission gratings. The optical design places light-weight grating arrays close to the telescope mirrors, which maximizes dispersion distance and thus spectral resolution and minimizes demands on mirror performance. It merges features from the Chandra High Energy Transmission Grating Spectrometer and the XMM-Newton Reflection Grating Spectrometer, and provides resolving power R = E/ΔE = 3000 - 5000 (full width half max) and effective area >1000 cm[superscript 2] in the soft x-ray band. We discuss recent results on ray-tracing and optimization of the optical design, instrument configuration studies, and grating fabrication.
DepartmentMassachusetts Institute of Technology. Department of Aeronautics and Astronautics; MIT Kavli Institute for Astrophysics and Space Research
Proceedings of SPIE--the International Society for Optical Engineering ; v. 7732
Institute of Electrical and Electronics Engineers
Heilmann, Ralf K. et al. “Critical-angle transmission grating spectrometer for high-resolution soft x-ray spectroscopy on the International X-ray Observatory.” Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray. Ed. Monique Arnaud, Stephen S. Murray, & Tadayuki Takahashi. San Diego, California, USA: SPIE, 2010. 77321J-11. © 2010 SPIE.
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