A soft x-ray beam-splitting multilayer optic for the NASA GEMS Bragg Reflection Polarimeter

Ryan Allured; Mónica Fernández-Perea; Regina Soufli; Jennifer B. Alameda; Alicia Maxwell; Michael J. Pivovaroff; Eric M. Gullikson; Philip Kaaret

doi:10.1117/12.930093

19 October 2012 A soft x-ray beam-splitting multilayer optic for the NASA GEMS Bragg Reflection Polarimeter

Ryan Allured, Mónica Fernández-Perea, Regina Soufli, Jennifer B. Alameda, Alicia Maxwell, Michael J. Pivovaroff, Eric M. Gullikson, Philip Kaaret

Author Affiliations +

Proceedings Volume 8502, Advances in X-Ray/EUV Optics and Components VII; 850206 (2012) https://doi.org/10.1117/12.930093
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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.

Citation Download Citation

Ryan Allured, Mónica Fernández-Perea, Regina Soufli, Jennifer B. Alameda, Alicia Maxwell, Michael J. Pivovaroff, Eric M. Gullikson, and 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); https://doi.org/10.1117/12.930093

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