Concept of a Double Tilted Rowland Spectrograph for X-Rays

Hans Moritz Günther; Casey T. DeRoo; Ralf K. Heilmann; Edward Hertz

doi:10.3847/1538-4357/ad739c

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Concept of a Double Tilted Rowland Spectrograph for X-Rays

Journal article

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Concept of a Double Tilted Rowland Spectrograph for X-Rays

Hans Moritz Günther, Casey T. DeRoo, Ralf K. Heilmann and Edward Hertz

The Astrophysical journal, Vol.975(1), 55

11/01/2024

DOI: 10.3847/1538-4357/ad739c

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Abstract

Abstract High-resolution spectroscopy in soft X-rays (<2 keV) requires diffractive elements to resolve any astrophysically relevant diagnostics, such as closely spaced lines, weak absorption lines, or line profiles. The Rowland torus geometry describes how gratings and detectors need to be positioned to optimize the spectral resolving power. We describe how an on-axis Rowland geometry can be tilted to accommodate blazed gratings. In this geometry, two channels with separate optical axes can share the same detectors (double tilted Rowland spectrograph). Small offsets between the channels can mitigate the effect of chip gaps and reduce the alignment requirements during the construction of the instrument. The double tilted Rowland spectrograph concept is especially useful for subapertured mirrors, because it allows an effective use of space in the entrance aperture of a spacecraft. One mission that applies this concept is the Arcus Probe.

Details

Title: Subtitle: Concept of a Double Tilted Rowland Spectrograph for X-Rays
Creators: Hans Moritz Günther
Casey T. DeRoo
Ralf K. Heilmann
Edward Hertz - Smithsonian Astrophysical Observatory
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.975(1), 55
Publisher: IOP Publishing Ltd
DOI: 10.3847/1538-4357/ad739c
ISSN: 0004-637X
eISSN: 1538-4357
Grant note: National Aeronautics and Space Administration (NASA)https://doi.org/10.13039/100000104: 80NSSC22K1904, SV3-73016, NAS8-03060 NASA
Support for this work was provided in part through NASA grant 80NSSC22K1904 and Smithsonian Astrophysical Observatory (SAO) contract SV3-73016 to MIT for support of the Chandra X-Ray Center (CXC), which is operated by SAO for and on behalf of NASA under contract NAS8-03060.
Language: English
Date published: 11/01/2024
Academic Unit: Physics and Astronomy; University College Courses
Record Identifier: 9984740860302771

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