Ray-tracing critical-angle transmission gratings for the X-ray Surveyor and Explorer-size missions

We study a critical angle transmission (CAT) grating spectrograph that delivers a spectral resolution significantly above any X-ray spectrograph ever own. This new technology will allow us to resolve kinematic components in absorption and emission lines of galactic and extragalactic matter down to u...

Full description

Bibliographic Details
Main Authors: Günther, Hans M. (Author), Heilmann, Ralf K (Contributor), Marshall, Herman (Contributor), Bautz, Marshall W. (Author), Huenemoerder, David P. (Author), Nowak, Michael A. (Author), Schulz, Norbert S. (Author)
Other Authors: MIT Kavli Institute for Astrophysics and Space Research (Contributor), Bautz, Marshall W (Contributor), Huenemoerder, David P (Contributor), Nowak, Michael A (Contributor), Schulz, Norbert S (Contributor)
Format: Article
Language:English
Published: SPIE, the International Society of Optical Engineering, 2018-06-18T16:30:49Z.
Subjects:
Online Access:Get fulltext
LEADER 03170 am a22003253u 4500
001 116360
042 |a dc 
100 1 0 |a Günther, Hans M.  |e author 
100 1 0 |a MIT Kavli Institute for Astrophysics and Space Research  |e contributor 
100 1 0 |a Bautz, Marshall W  |e contributor 
100 1 0 |a Heilmann, Ralf K  |e contributor 
100 1 0 |a Huenemoerder, David P  |e contributor 
100 1 0 |a Marshall, Herman  |e contributor 
100 1 0 |a Nowak, Michael A  |e contributor 
100 1 0 |a Schulz, Norbert S  |e contributor 
700 1 0 |a Heilmann, Ralf K  |e author 
700 1 0 |a Marshall, Herman  |e author 
700 1 0 |a Bautz, Marshall W.  |e author 
700 1 0 |a Huenemoerder, David P.  |e author 
700 1 0 |a Nowak, Michael A.  |e author 
700 1 0 |a Schulz, Norbert S.  |e author 
245 0 0 |a Ray-tracing critical-angle transmission gratings for the X-ray Surveyor and Explorer-size missions 
260 |b SPIE, the International Society of Optical Engineering,   |c 2018-06-18T16:30:49Z. 
856 |z Get fulltext  |u http://hdl.handle.net/1721.1/116360 
520 |a We study a critical angle transmission (CAT) grating spectrograph that delivers a spectral resolution significantly above any X-ray spectrograph ever own. This new technology will allow us to resolve kinematic components in absorption and emission lines of galactic and extragalactic matter down to unprecedented dispersion levels. We perform ray-trace simulations to characterize the performance of the spectrograph in the context of an X-ray Surveyor or Arcus like layout (two mission concepts currently under study). Our newly developed ray-trace code is a tool suite to simulate the performance of X-ray observatories. The simulator code is written in Python, because the use of a high-level scripting language allows modifications of the simulated instrument design in very few lines of code. This is especially important in the early phase of mission development, when the performances of different configurations are contrasted. To reduce the run-time and allow for simulations of a few million photons in a few minutes on a desktop computer, the simulator code uses tabulated input (from theoretical models or laboratory measurements of samples) for grating efficiencies and mirror reflectivities. We find that the grating facet alignment tolerances to maintain at least 90% of resolving power that the spectrometer has with perfect alignment are (i) translation parallel to the optical axis below 0.5 mm, (ii) rotation around the optical axis or the groove direction below a few arcminutes, and (iii) constancy of the grating period to 1:10 5 . Translations along and rotations around the remaining axes can be significantly larger than this without impacting the performance. 
520 |a United States. National Aeronautics and Space Administration (Smithsonian Astrophysical Observatory (SAO) contract SV3-73016) 
520 |a United States. National Aeronautics and Space Administration (contract NAS8-03060) 
690 |a ray-tracing, X-ray optics, critical angle transmission grating, X-ray Surveyor, Arcus 
655 7 |a Article 
773 |t Proceedings of SPIE--the Society of Photo-Optical Instrumentation Engineers