CAT grating alignment and testing for soft x-ray polarimetry

Alan Garner; Herman L. Marshall; Sarah N. Trowbridge Heine; Ralf K. Heilmann; Jungki Song; Norbert S. Schulz; Beverly J. LaMarr; Mark Egan

doi:10.1117/12.2561734

13 December 2020 CAT grating alignment and testing for soft x-ray polarimetry

Alan Garner, Herman L. Marshall, Sarah N. Trowbridge Heine, Ralf K. Heilmann, Jungki Song, Norbert S. Schulz, Beverly J. LaMarr, Mark Egan

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Proceedings Volume 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray; 114445Z (2020) https://doi.org/10.1117/12.2561734
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

We present an update on our work measuring the performance and alignment of the critical-angle transmission (CAT) gratings for the proposed sounding Rocket Experiment Demonstration of a Soft X-ray Polarimeter (REDSoX) mission, as well as a possible orbital version. We built and verified a grating alignment system that could be used for REDSoX Polarimeter fabrication. The performances of the gratings were measured using the MIT polarimetry beamline. The beamline is a monochromator and has been used to measure the absolute efficiencies of not only the REDSoX prototype gratings but also the Arcus Phase A gratings. It is also capable of producing and measuring polarized soft X-rays to aid in the development and testing of future missions. Lastly, we present an update on our effort applying twisted crystals to X-ray polarimetry. Support for this work was provided in part by the NASA grant NNX15AL14G and a grant from the MIT Kavli Institute Research Investment Fund.

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Alan Garner, Herman L. Marshall, Sarah N. Trowbridge Heine, Ralf K. Heilmann, Jungki Song, Norbert S. Schulz, Beverly J. LaMarr, and Mark Egan "CAT grating alignment and testing for soft x-ray polarimetry", Proc. SPIE 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray, 114445Z (13 December 2020); https://doi.org/10.1117/12.2561734

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