19 October 2012 A soft x-ray beam-splitting multilayer optic for the NASA GEMS Bragg Reflection Polarimeter
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Abstract
A soft X-ray, beam-splitting, multilayer optic has been developed for the Bragg Reflection Polarimeter on the NASA Gravity and Extreme Magnetism Small Explorer Mission (GEMS). The optic is designed to reflect 0.5 keV X-rays through a 90 degree angle to the BRP detector, and transmit 2-10 keV X-rays to the primary polarimeter. A transmission requirement prevents the use of a thick substrate, so a 2 µm thick polyimide membrane was used. Atomic force microscopy has shown the membrane to possess high spatial frequency roughness less than 0.2 nm rms, permitting adequate X-ray reflectance. A multilayer thin film was especially developed with reflectance and transmission properties that satisfy the BRP requirements and with near-zero stress. Multilayer depositions for prototype reflectors have been performed via magnetron sputtering. Reflectivity and transmission measurements closely match theoretical predictions, both before and after rigorous environmental testing.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ryan Allured, Ryan Allured, Mónica Fernández-Perea, Mónica Fernández-Perea, Regina Soufli, Regina Soufli, Jennifer B. Alameda, Jennifer B. Alameda, Alicia Maxwell, Alicia Maxwell, Michael J. Pivovaroff, Michael J. Pivovaroff, Eric M. Gullikson, Eric M. Gullikson, Philip Kaaret, Philip Kaaret, } "A soft x-ray beam-splitting multilayer optic for the NASA GEMS Bragg Reflection Polarimeter", Proc. SPIE 8502, Advances in X-Ray/EUV Optics and Components VII, 850206 (19 October 2012); doi: 10.1117/12.930093; https://doi.org/10.1117/12.930093
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