Concept of a Double Tilted Rowland Spectrograph for X-Rays
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 o...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2024-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/ad739c |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850200808499445760 |
|---|---|
| author | Hans Moritz Günther Casey T. DeRoo Ralf K. Heilmann Edward Hertz |
| author_facet | Hans Moritz Günther Casey T. DeRoo Ralf K. Heilmann Edward Hertz |
| author_sort | Hans Moritz Günther |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-ff9a1db4fb0d431e9da6d9920b1e70a5 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-ff9a1db4fb0d431e9da6d9920b1e70a52025-08-20T02:12:11ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0197515510.3847/1538-4357/ad739cConcept of a Double Tilted Rowland Spectrograph for X-RaysHans Moritz Günther0https://orcid.org/0000-0003-4243-2840Casey T. DeRoo1https://orcid.org/0000-0002-9184-4561Ralf K. Heilmann2https://orcid.org/0000-0001-9980-5295Edward Hertz3https://orcid.org/0000-0002-6747-9648MIT Kavli Institute for Astrophysics and Space Research , 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; hgunther@mit.eduDept. of Physics & Astronomy, University of Iowa , Iowa City, IA 52242, USAMIT Kavli Institute for Astrophysics and Space Research , 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; hgunther@mit.edu; Space Nanotechnology Laboratory, MIT Kavli Institute for Astrophysics and Space Research , Cambridge, MA 02139, USACenter for Astrophysics, Smithsonian Astrophysical Observatory , Cambridge, MA 02138, USAHigh-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.https://doi.org/10.3847/1538-4357/ad739cAstronomical instrumentationSpectrometersSpace observatoriesX-ray telescopes |
| spellingShingle | Hans Moritz Günther Casey T. DeRoo Ralf K. Heilmann Edward Hertz Concept of a Double Tilted Rowland Spectrograph for X-Rays The Astrophysical Journal Astronomical instrumentation Spectrometers Space observatories X-ray telescopes |
| title | Concept of a Double Tilted Rowland Spectrograph for X-Rays |
| title_full | Concept of a Double Tilted Rowland Spectrograph for X-Rays |
| title_fullStr | Concept of a Double Tilted Rowland Spectrograph for X-Rays |
| title_full_unstemmed | Concept of a Double Tilted Rowland Spectrograph for X-Rays |
| title_short | Concept of a Double Tilted Rowland Spectrograph for X-Rays |
| title_sort | concept of a double tilted rowland spectrograph for x rays |
| topic | Astronomical instrumentation Spectrometers Space observatories X-ray telescopes |
| url | https://doi.org/10.3847/1538-4357/ad739c |
| work_keys_str_mv | AT hansmoritzgunther conceptofadoubletiltedrowlandspectrographforxrays AT caseytderoo conceptofadoubletiltedrowlandspectrographforxrays AT ralfkheilmann conceptofadoubletiltedrowlandspectrographforxrays AT edwardhertz conceptofadoubletiltedrowlandspectrographforxrays |