1. Line Spread Functions of Blazed Off-Plane Gratings Operated in the Littrow Mounting
- Author
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DeRoo, Casey T., McEntaffer, Randall L., Miles, Drew M., Peterson, Thomas J., Marlowe, Hannah, Tutt, James H., Donovan, Benjamin D., Menz, Benedikt, Burwitz, Vadim, Hartner, Gisela, Allured, Ryan, Smith, Randall K., Gunther, Ramses, Yanson, Alex, Vacanti, Giuseppe, and Ackermann, Marcelo
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Future soft X-ray (10 - 50 Angstrom) spectroscopy missions require higher effective areas and resolutions to perform critical science that cannot be done by instruments on current missions. An X-ray grating spectrometer employing off-plane reflection gratings would be capable of meeting these performance criteria. Off-plane gratings with blazed groove facets operated in the Littrow mounting can be used to achieve excellent throughput into orders achieving high resolutions. We have fabricated two off-plane gratings with blazed groove profiles via a technique which uses commonly available microfabrication processes, is easily scaled for mass production, and yields gratings customized for a given mission architecture. Both fabricated gratings were tested in the Littrow mounting at the Max-Planck-Institute for extraterrestrial Physics PANTER X-ray test facility to assess their performance. The line spread functions of diffracted orders were measured, and a maximum resolution of 800 $\pm$ 20 is reported. In addition, we also observe evidence of a `blaze' effect from measurements of relative efficiencies of the diffracted orders., Comment: 25 pages including references
- Published
- 2016