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25 April 2024 |
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A Soft X-ray Beam-splitting Multilayer Optic for the NASA GEMS Bragg Reflection Polarimeter | | Ryan Allured
; Monica Fernandez-Perea
; Regina Soufli
; Jennifer B. Alameda
; Michael J. Pivovaroff
; Eric M. Gullikson
; Philip Kaaret
; | | Date: |
26 Mar 2013 | | 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 90 degree 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 micron 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. | | Source: | arXiv, 1303.6549 | | Services: | Forum | Review | PDF | Favorites | |
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