The Constellation-X RGS options: raytrace modeling of the off-plane gratings

Kathryn A. Flanagan; John E. Davis; Ralf K. Heilmann; Alan M. Levine; Michael McGuirk; George R. Ricker; Mark L. Schattenburg; Michael Wise; Andrew Rasmussen; Jay A. Bookbinder; Mark D. Freeman; Terrance J. Gaetz; Diab Jerius; Dan Nguyen; William A. Podgorski; P. B. Reid; Webster C. Cash; Ann F. Shipley; Dennis J. Gallagher; Pei Huang; Steve P. Jordan

doi:10.1117/12.551766

11 October 2004 The Constellation-X RGS options: raytrace modeling of the off-plane gratings

Kathryn A. Flanagan, John E. Davis, Ralf K. Heilmann, Alan M. Levine, Michael McGuirk, George R. Ricker, Mark L. Schattenburg, Michael Wise, Andrew Rasmussen, Jay A. Bookbinder, Mark D. Freeman, Terrance J. Gaetz, Diab Jerius, Dan Nguyen, William A. Podgorski, P. B. Reid, Webster C. Cash, Ann F. Shipley, Dennis J. Gallagher, Pei Huang, Steve P. Jordan

Author Affiliations +

Proceedings Volume 5488, UV and Gamma-Ray Space Telescope Systems; (2004) https://doi.org/10.1117/12.551766
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The Reflection Grating Spectrometer of the Constellation-X mission has two strong candidate configurations. The first configuration, the in-plane grating (IPG), is a set of reflection gratings similar to those flown on XMM-Newton and has grooves perpendicular to the direction of incident light. In the second configuration, the off-plane grating (OPG), the grooves are closer to being parallel to the incident light, and diffract along a cone. It has advantages of higher packing density, and higher reflectivity. Confinement of these gratings to sub-apertures of the optic allow high spectral resolution. We have developed a raytrace model and analysis technique for the off-plane grating configuration. Initial estimates indicate that first order resolving powers in excess of 1000 (defined with half-energy width) are achievable for sufficiently long wavelengths (λ ≥ 12Å), provided separate accommodation is made for gratings in the subaperture region farther from the zeroth order location.

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Kathryn A. Flanagan, John E. Davis, Ralf K. Heilmann, Alan M. Levine, Michael McGuirk, George R. Ricker, Mark L. Schattenburg, Michael Wise, Andrew Rasmussen, Jay A. Bookbinder, Mark D. Freeman, Terrance J. Gaetz, Diab Jerius, Dan Nguyen, William A. Podgorski, P. B. Reid, Webster C. Cash, Ann F. Shipley, Dennis J. Gallagher, Pei Huang, and Steve P. Jordan "The Constellation-X RGS options: raytrace modeling of the off-plane gratings", Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); https://doi.org/10.1117/12.551766

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