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13 December 2020 Ray-tracing a small orbital mission for soft-x-ray polarimetry
Hans Moritz Günther, Herman L. Marshall, Alan Garner
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Proceedings Volume 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray; 1144460 (2020) https://doi.org/10.1117/12.2562860
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only
Abstract
X-ray polarimetry is still largely uncharted territory. With the upcoming launch of IXPE, we will learn a lot more about X-ray polarization at energies above 2 keV, but so far no current or accepted mission provides observational capabilities below 2 keV. We present ray-tracing results for a small orbital mission that could be launched within NASA’s Pioneer or SmallSat cost-cap to provide X-ray polarimetry below 2 keV. The design is based on the use of laterally-graded multi-layer (ML) mirrors, a concept that we have developed theoretically for the REDSoX Polarimeter,1 for which most components have been verified in the laboratory. In this contribution, we describe a single channel orbital mission based on the same idea, but modified to the unique cost and space requirements. All results scale up easily to two or more polarimetry channels. Scaling up would simply increase the effective area and reduce the need to rotate the instrument to measure the different polarization directions. In particular, we use the ray-traces to define the maximum size of the dispersion gratings and to determine an alignment budget.
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Hans Moritz Günther, Herman L. Marshall, and Alan Garner "Ray-tracing a small orbital mission for soft-x-ray polarimetry", Proc. SPIE 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray, 1144460 (13 December 2020); https://doi.org/10.1117/12.2562860
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KEYWORDS
Polarimetry
X-rays
Mirrors
Polarization
Rockets
Satellites
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