Journal article
A soft X-ray beam-splitting multilayer optic for the NASA GEMS Bragg Reflection Polarimeter
Experimental astronomy, Vol.36(1-2), pp.371-388
04/12/2013
DOI: 10.1007/s10686-013-9337-2
Abstract
A soft X-ray, beam-splitting, multilayer optic has been developed for the Bragg Reflection Polarimeter (BRP) on the NASA Gravity and Extreme Magnetism Small Explorer Mission (GEMS). The optic is designed to reflect 0.5 keV X-rays through a
angle to the BRP detector, and transmit 2–10 keV X-rays to the primary polarimeter. The 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 and deposited via magnetron sputtering with reflectance and transmission properties that satisfy the BRP requirements and with near-zero stress. Reflectance and transmission measurements of BRP prototype elements closely match theoretical predictions, both before and after rigorous environmental testing.
Details
- Title: Subtitle
- A soft X-ray beam-splitting multilayer optic for the NASA GEMS Bragg Reflection Polarimeter
- Creators
- Ryan Allured - University of IowaMónica Fernández-Perea - Lawrence Livermore National LaboratoryRegina Soufli - Lawrence Livermore National LaboratoryJennifer B Alameda - Lawrence Livermore National LaboratoryMichael J Pivovaroff - Lawrence Livermore National LaboratoryEric M Gullikson - Lawrence Berkeley National LaboratoryPhilip Kaaret - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Experimental astronomy, Vol.36(1-2), pp.371-388
- DOI
- 10.1007/s10686-013-9337-2
- ISSN
- 0922-6435
- eISSN
- 1572-9508
- Publisher
- Springer Netherlands
- Language
- English
- Date published
- 04/12/2013
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199858002771
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