Optical and x-ray alignment approaches for off-plane reflection gratings

Ryan Allured, Benjamin D. Donovan, Casey T. DeRoo, Hannah R. Marlowe, Randall L. McEntaffer, James H. Tutt, Peter N. Cheimets, Edward Hertz, Randall K. Smith, Vadim Burwitz, Gisela Hartner, Benedikt Menz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations


Off-plane reflection gratings offer the potential for high-resolution, high-throughput X-ray spectroscopy on future missions. Typically, the gratings are placed in the path of a converging beam from an X-ray telescope. In the off-plane reflection grating case, these gratings must be co-aligned such that their diffracted spectra overlap at the focal plane. Misalignments degrade spectral resolution and effective area. In-situ X-ray alignment of a pair of off-plane reflection gratings in the path of a silicon pore optics module has been performed at the MPE PANTER beamline in Germany. However, in-situ X-ray alignment may not be feasible when assembling all of the gratings required for a satellite mission. In that event, optical methods must be developed to achieve spectral alignment. We have developed an alignment approach utilizing a Shack-Hartmann wavefront sensor and diffraction of an ultraviolet laser. We are fabricating the necessary hardware, and will be taking a prototype grating module to an X-ray beamline for performance testing following assembly and alignment.

Original languageEnglish (US)
Title of host publicationOptics for EUV, X-Ray, and Gamma-Ray Astronomy VII
EditorsGiovanni Pareschi, Stephen L. O'Dell, Giovanni Pareschi, Stephen L. O'Dell
ISBN (Electronic)9781628417692, 9781628417692
StatePublished - 2015
EventOptics for EUV, X-Ray, and Gamma-Ray Astronomy VII - San Diego, United States
Duration: Aug 10 2015Aug 13 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherOptics for EUV, X-Ray, and Gamma-Ray Astronomy VII
Country/TerritoryUnited States
CitySan Diego

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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