Kavli Affiliate: Ralf K. Heilmann
| First 5 Authors: Hans Moritz Günther, Casey T. DeRoo, Ralf K. Heilmann, Edward Hertz,
| Summary:
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, DTRS). Small offsets between the channels can mitigate the effect
of chip gaps and reduce the alignment requirements during the construction of
the instrument. The DTRS concept is especially useful for sub-apertured
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.
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